the supercam array at apex
Contents
1. ttn 16 ed SPO Wet r terme rb 16 Z4 amp Total Power COnsump 18 E LS OI EIN TERN GES est 19 Sl TOMH Be fe ees o eame otn etm 19 3 25 O YNES prose 19 5 9 amp IP Outp ts and the Supercam Fiducial Pixel niet ted t teet tst idees 19 6 TIMING INTEREAGCBE S S 20 6 1 Synchronization and Blanking Signals sees 20 RCI CC usus te EET Uu pP at Mud MEE Re 20 TSSORIWAREINTEREAGCBES J eph e e Erden ite nah 20 T L6 Tnstrument Command ane tete been manet toe bte etie 20 TL bs Low Level Instrument te ees 20 7 1 2 Supercam s Command and Control Interface to 22 7 25 mupported Observins deti dr GR a e meat 23 Tess Data BIOS andre catene te or 24 7 3 TE e Fiducial Single Pixel Interface Re rene Ree 24 25supercam mtn tue e som dum cae Patet cuo M aaa eee 24 EE aon redd DENISE EIS S NE OTT 26 SSPERSONNELINTERFPAC ES ie ER iate eo ate NEEE ees 26 Sd PE Sale eniti ide se See Tee Te Team ons neto tas 27 2 tesa cea 2 Page 3 of 32 Supercam at APEX ICD 8 3 Observ2. blankServer TCP socket server port 9002 supercam1 TCP socket server mailbox type port 9003 supercam8 Supercam Cryostat ASCII commands and responses SuperComm amp Monitor to all servers Omnisys binary commands FFTS and responses observing SuperComm amp Monitor notifications Observing apex2hht a Engine registration CORBA SCPI amp w notification TCP socket server center port 9010 SuperComm Monitor opticsServe TCP socket server port 9005 TCP socket server socket server mailbox type mailbox type port 1726 port 9009 dhcpd SpecServer socket server issue IP port 9734 address Scarfer tracker level 1 FITS equivalent RA DEC processor Scooper level FITS processor vsftpd data return stream to scooper TCP socket server mailbox port 9013 standalone C program gt SpecServer issue IP TCP socket server data address port 9734 storage binary commands and responses SuperComm amp Monitor Figure 7 1 Block diagram of Supercam s command and control system from hardware to APECS interface Page 21 of 32 Supercam at APEX ICD 7 1 2 Supercam s Command and Control Interface to APECS Strategy While the current HHT interface defined in SuperComm is well tested it does not match the formalized d
3. THE SUPERCAM ARRAY AT APEX INTERFACE CONTROL DOCUMENT Version 2 0 12 October 2014 Supercam at APEX ICD VERSION HISTORY Version Implemented Revision jdn Approval Description of Changes By Date Date Craig Kulesa 16 July 2014 First First complete draft First complete draft i 1 M Kulesa 17 M 2014 Typographic edits 2 Added 10 MHz reference 3 Added timing interfaces Mu Kulesa 31 2014 1 First draft of changes reflecting discussion at site visit up to Software Section Craig Kulesa 31 July 2014 1 Added brief section on UPS 2 ARTEMIS helium lines Craig Kulesa 4 Aug 2014 1 Edited software section based on 31 July discussion 2 Edited Figure 1 1 to eliminate Arizona A cabin pickoff 3 Edited roles per discussion 4 Numerous small edits 1 5 Craig Kulesa 24 Aug 2014 1 CTI compressor is actually single phase all 3 phases go into the compressor but one leg is unused internally 2 First edit of software section based on initial email discussion w Dirk Muders 1 6 Craig Kulesa Sept 2014 1 Updated mechanical section including ICD and C cabin installations some contributions from Ruben and Paul 1 7 Craig Kulesa 19 Sept 2014 1 Updated mechanical section with integrated FEA and thread analysis RD and CK 2 Updated electrical section including documentation of UPS module power distribution and control and transformer CK 3 Updated software section command and control
4. data calibration and processing CK 2 0 Craig Kulesa 12 Oct 2014 Minor tweaks following discussions Completed summary table of interface descriptions FINAL DRAFT Page 2 of 32 Supercam at APEX ICD TABLE OF CONTENTS ESO TORY 4 Scope and Purpose or This DOCU CIN iie an HO d Qo a en 4 1 2 Description of Instrument 4 2 MECHUANICAEINTEREAGCE 5 2 ER ER Erie reet o eens 5 tyostaband Tae cascade d 5 2 2 Compressors and Helluni LG Sx icc tee 10 SUP POLE NCCU OLNIC SIN ACK ooo MIO NER MIN ON MR HIN 12 2 4 Total Installed Weight Into CHC a Dit canat expe mes ques co etes en ed eti ques co etes edens 13 SeOPTICALIENDEREACHBS 2ietieeteeic tee teet E 13 3 1 Operation of Swing Arm for A Cabin and 13 2 2 TwosPositoim Calibration me ratae hem ce amen ce 14 ESRB NEG Ils RENI T Tm 14 beam REI IY eame desea eub desee A uu ded cast 15 4 ELECIRICALINTEREXGCES niet eoe EE EE EO EIER 15 A ToC cs Trans OEIS eto etm FOE UR eR t eto 15 4 2 SUDDOLt BIOCHOPBICS
5. geometry wobbler source offset and command Per subscan there is a message when it starts and finishes The start messages optionally include the wobbler phase description 1f wobbling 1s enabled This provides essential information for the Supercam pipeline which wants this information prior to starting the observation The FITS headers can then be populated with remaining information from the obslog and syslog files 1f necessary and the top level FITS files as appropriate Table 7 1 These can be accumulated by or in parallel with the level 1 processor scarfer Obslog Syslog Top level FITS Source name coords vel Subscan MJD timestanp Antenna az el focus Integration time LONGOFF LATOFF Line name and freq to MHz Antenna offset PHASE 1 or 2 Source offsets scan Designation PARANGLE deg ON REF SKY HOT COLD OFF ref position Source velocity amp frame scan number subscans Earth velocity amp frame Scan time Sky frequency LSB amp USB Obs mode Scan type Scan number Ambient temp pressure pwv scan type MAP CAL Observing command w parms Scan mode OTF raster Last CAL Tsys Trec Tcal Most recent MBFITS subscan 7 2 Table 7 1 List of scan information available from APECS and where it can be found SUPPORTED OBSERVING MODES Based on the science proposals submitted to APEX we are aware of supporting two main observing modes On the
6. 0004 V1 9 3 April 2007 APEX MPI ICD 0003 VO 5 6 September 2002 APEX MPI DSD 0012 V1 0 10 January 2006 APEX MPI ICD 0001 V1 1 1 October 2004 APEX MPI ICD 0002 V1 63 5 August 2011 Complete description of the Supercam integration effort for APEX m APEX SCPI socket command syntax and backend data stream format APEX Instruments Generic CORBA IDL Interfaces online APEX Standard online Hardware Interfaces APEX Heterodyne online Tertiary Optics APEX Nasmyth A online Cabin MBFITS Raw Data online Format Page 31 of 32 Supercam at APEX ICD APPENDIX C KEY TERMS The following table provides definitions for terms relevant to this document Command and Control Quality Assurance UHMW Ultra high molecular weight APECS APEX Control System area L B Network Time Protocol Page 32 of 32
7. Fly OTF mapping and Position Switching PS These modes will be fully supported in the Supercam data pipeline and command control system For commissioning and calibration it is useful to support beam switched observations using the nodding secondary Provided that the secondary can be programmed to cycle at a sufficiently slow rate 1 2 Hz creating a 2 4 Hz spectrometer cadence with an adequate BLANKING time see Section 6 1 beam switched observations should be fully supported by the instrument control system and the data pipeline Page 23 of 32 Supercam at APEX ICD 7T 3 DATA FLOW AND ARCHIVING 7 3 1 Fiducial Single Pixel Interface Supercam can provide a single pixel IF output centered at 5 GHz and at 30 to 60 dBm to a supported facility IF processor and backend In this manner one of Supercam s pixels can follow the expected data flow for an APEX receiver through apexOnlineFitsWriter and apexOnlineCalibrator and apexCalibDisplayServer These data products will flow through the standard APEX portals from display2 at the summit to Sequitor and then daily through the esodata archiving tool at the ESO data archive in Santiago and then on to ESO Garching with both MBFITS and CLASS data outputs This basic data flow is shown in Figure 7 2 and is independent of the specific handling of the 64 beam Supercam FFTS data described in the following Section 7 3 2 Supercam fiducial pixel on APEX XFFTS2 the A 4 GE lt M a
8. stop at Sequitor and be archived with the final survey products at Arizona and IPAC Garching 7 4 NETWORK INTERFACES Supercam s network structure is hidden behind a 16 port 10 100 Mbit ethernet switch which presents internal 192 168 1 xxx and 192 168 2 xxx subnets for instrument use Only supercam9 the master data acquisition computer requires a static IP address from the APEX network Several IP addresses are required by the installation and commissioning team for personal laptops via ethernet and or 802 11 However dynamic allocation from a pool of addresses e g DHCP is adequate as these machines do not need to have static or stable addresses 8 PERSONNEL INTERFACES It is important to establish the general roles and responsibilities and overall structure of the work effort In particular here we would like to identify how the observing run 1s to be performed by whom in order to assess the requirements for the deploying team Installation and commissioning 1s a fairly straightforward work effort that necessarily leans heavily on the Supercam Instrument team The overarching question is how observations will be undertaken and how the Supercam and APEX teams will be involved in planning them scheduling them carrying them out and supporting them to publication Page 26 of 32 8 1 8 2 Supercam at APEX ICD Based on discussions Supercam will be considered a PI instrument by the APEX facility However at the l
9. wheel calibration of the temperature scale Calibrations will be performed at regular intervals typically every few minutes depending on the variability of the atmosphere The actuator will flip between two fixed positions and the absolute position of the disk will be verified through the use of an internal encoder indexer position and registration of the disk by magnetic Hall effect sensors at the clockwise and counter clockwise limits The blackbody temperature of the load will be continuously monitored for calibration COLD CALIBRATIONS At HHT manual cold calibrations using a two layer 20x20 cm paddle of LN2 soaked eccosorb AN 72 are performed whenever the receiver is re tuned or otherwise about 2 3 times daily At APEX it 1s expected that Supercam will spend nearly all of its time at the supported CO 3 2 frequency 345 795 GHz Other frequencies will be tested in the lab by request Currently the CO J 3 2 line at 330 GHz is the only other known requirement for December 2014 As it may involve a change in hardware and requires cold calibration switching spectral lines can only be done when personnel are on site To facilitate manual cold calibrations the facilitator will need to bring a laptop computer into the cabin with a cold load software application running The Cold Load application will listen to APECS for signals to perform a Hot Cold Sky calibration and will advise the facilitator to insert the cold load into position
10. 00 GHz though the power output of the current Local Oscillator LO restricts this range to 330 365 GHz The baseline operating mode will observe the CO J 3 2 line at 345 795 GHz in the upper sideband USB The focal plane is comprised of eight integrated blocks each with 8 feedhorns mixers and low noise amplifiers LNAs cooled to 5K through a Giffords McMahon GM closed cycle cryocooler 64 stainless steel coaxial cables bring out the mixer IFs and are precooled to 15K with a second GM cryocooler The 4 6 GHz IF outputs are passed first to IF processor modules and then to a digital FFT spectrometer The IF processor filters amplifies and downconverts the 5 GHz IF to baseband Bias voltages for Page 4 of 32 Supercam at APEX ICD each mixer s SIS device electromagnet and LNA are provided by 8 channel bias cards mounted in a half height rackmount chassis adjacent to the cryostat All voltages in the cryostat are monitored by the bias cards macrocontrollers isolation and noise reduction for returning signals 1s provided by a preamplifier between the bias cards and the cryostat The instrument is remotely controlled via TCP socket servers over ethernet An overview of the instrument and its APEX interfaces 1s shown in in Figure 1 1 2 MECHANICAL INTERFACE 2 1 CRYOSTAT AND OPTICAL FRAME Supercam will install to the APEX standard mounting ring the invar ring at the top of the Cassegrain Cabin C cabin While a floor support 1
11. EC 309 Ee 60 Y 208 VAC 3 pole N G 5 pin Table 4 2 Compressor plug types currently used in Supercam SUPPORT ELECTRONICS The three electronics support modules shown in Table 2 2 nominally operate from single phase 115V AC power We will adapt all support electronics to use 1 phase 50 Hz 230V AC Naturally some of these components are already dual voltage capable In summer 2014 we will make as many components 230VAC native as possible It is expected that we will combine all such 230VAC native components still using North American plugs onto a single power strip which can be mated to the normal European AC power receptacle with a straightforward adapter The remaining few items at 115 VAC will operate from small power transformers to be installed in or near the Support Electronics Module POWER FILTERING AND UPS Power conditioning and protection for the Supercam instrument will be provided by a 1500 VA Eaton 9130 UPS Figure 4 2 which has a standard rackmount 2U footprint and weighs 20 kg It has IEC 320 C14 plugs for the AC input and IEC 320 C13 receptacles for the outputs At a 1 kW load the standard run time is anticipated to be 7 minutes adequate to safely shut down the system 1 minute or less The AC power distribution interface diagram is shown in Figure 4 3 and puts all critical items behind the operation of the UPS These Page 16 of 32 Supercam at APEX ICD items are also under dire
12. T A amp M 4 3 v Y Y port 0 y b updated hourly 4 pamm archive seqdr lastarria Garching permanent ESO Archive Figure 7 2 Data flow for Supercam s fiducial pixel routed through the APEX facility IF system to a facility spectrometer XFFTS2 or AFFTS These data follow the standard flow for APEX and would provide quick look data for one of Supercam s IFs 7 3 2 Supercam FFTS data Supercam s 64 beam spectral data are acquired independently of APEX systems and are automatically processed through a two stage pipeline that takes the data to flux calibrated and velocity calibrated spectra The data processing levels are defined as e Level 0 Raw spectrometer bandpasses stateless binary files e Level 0 5 Raw bandpasses with header information written as SDFITS e Level 1 Calibrated spectra in S R R format optionally baselined in SDFITS Level 2 Baseline subtracted regridded spectral line FITS cubes Page 24 of 32 Supercam at APEX ICD e Level 3 Science products catalogs of objects etc Supercam automatically generates Level 0 5 and Level 1 data products through its two stage pipeline The Level 0 pipeline is called scooper and the Level 1 pipeline 1s called scarfer see Figure 7 1 These are not normally run by the user interactively except during the initial phases of commissioning In contrast the level 2 pipeline is not run automatically but rathe
13. ailable to APEX 1s shown in Figure 5 2 We will supply the broadest IF possible but degradation above 7 5 GHz is likely The output power can be as high as 35 dBm and can be manually attenuated to any required level We notionally assume 50 dBm in a 4 6 GHz bandpass as a default with an option to run filterless or with a broader filter Page 19 of 32 Supercam at APEX ICD cryostat wall 35 to 60 dBm to facility To Supercam IF processor fiducial mixer and 5 near center of array Figure 5 2 Block diagram of Supercam 5 generic single pixel a k a fiducial interface to the APEX facility IF system 6 TIMING INTERFACES 6 1 6 2 SYNCHRONIZATION AND BLANKING SIGNALS For beam switched observations external synchronization and blanking signals are needed The SYNC signal defines the phase for the beam switched integration secondary nutation left or right and the BLANKING signal is used to mask out the transition time The Supercam FFTS requires a minimum 40 msec blanking time 50 msec is preferred We understand that the delayed blanking signals from APEX are to be used for this specification We ask to not nutate the subreflector faster than 2 Hz 1 Hz is ideal These signals are brought into the Supercam FFTS over BNC terminated coax cables from the facility D sub connector Q The pinout specification and cable length are required NTP TIME REFERENCE The Supercam data acquisition PC needs to have a
14. am Distributed Objects DOs in the ACS Configuration Data Base CDB hosts and ports for both commands and science data have been defined The backend data stream format that scooper provides will follow the format defined in APEX MPI ICD 0005 Figure 7 3 shows the expected implementation of the parallel data stream and shows the archive flow analogous to Figure 7 2 The uncompressed data rate for OTF mapping at a 3 Hz cadence in dual stream mode is 12 Mbit s and could represent the peak rate The compression level for level 0 data 1s expected to be 2 1 with gzip or greater using xz compression Page 25 of 32 Supercam at APEX ICD Supercam Supercam FFTS LevelO Level 0 5 64 beam FFTS data E raw SDFITS Level 0 5 raw stream 9 zs gt 4 i 1 M _ AEPA i Jl Level 1 MBFITS updated hourly Level 0 5 Level 1 eut archive seqdr lastarria daily daily Tucson SDFITS esodata MBFITS Level 0 soral CLASS Level 1 web archive hourly FITS oa ena eee ee eee eee woe eee ees eee ur IESU SEHEN biannual Pasadena data release jan MBFITS pue permanent ESO Archive class i pus IPAC Archive CALIFORNIA REPUBLIC eve l Figure 7 3 Dual channel data flow for Supercam s 64 beam FFTS data APEX standard MBFITS and CLASS files will pass to ESO through the Archive while the standard Supercam pipeline data in SDFITS format will likely
15. at 230V 1 phase The currently adopted plug types are shown in Table 4 1 The CTI can be operated from the single phase 220VAC 50 Hz with the appropriate switches set inside the compressor The Supercam team will identify an isolated 15 kVA transformer needed to supply Supercam s SHI compressor with 50 Hz 208V 3 phase power The transformer should be installed in advance of the 22 November start of installation if possible If shipped from North America the following isolation transformer may be selected http www temcoindustrialpower com products Transformers General T46078 html An isolation transformer is specified for safety to ensure that a failure in either winding does not transfer to the other or that an overvoltage condition in the primary does not auto transform to an overvoltage in the secondary Figure 4 1 Isolation transformer selected for Supercam s Sumitomo compressor if shipped from North America Page 15 of 32 4 2 4 3 Supercam at APEX ICD Attribute Specification Phase 3 primary Delta secondary Wye KVA 15 Windings Copper Temperature rise 115C or less Mechanical Steel enclosure 86 kg total 40x60x55 cm Table 4 1 Isolation transformer specifications Compressor Plug type and diagram Power rating CTI 8200 NEMA twist lock 20A Y or A 208 VAC L21 20 120 Note wired for North American split phase 3 leg is unwired inside compressor SHI CNA 61C I
16. ccess to an NTP time server to serve as a time reference What 15 the IP address of the nearest time server SOFTWARE INTERFACES 7 1 INSTRUMENT COMMAND AND CONTROL 7 1 1 Low Level Instrument Control The overall software layout for Supercam as anticipated for APEX is diagrammed in Figure 7 1 The Supercam instrument hardware is controlled by a series of TCP socket servers operating from embedded ARM macrocontrollers supercam1 8 and the Data Acquisition computer supercam9 in the Support Electronics Rack These hardware servers are e biasServer runs on all 8 Supercam macrocontrollers and controls the bias electronics cards that supply SIS electromagnet and LNA bias voltages to the cryostat BiasServer also can monitor any of the sensed voltages in the cryostat Supercam8 also is wired to handle the synthesizer function that sets the sky frequency for the LO e blankServer runs on supercaml and provides the integrate TTL signal to the Omnisys FFT spectrometer that is used for OTF mapping This signal is locally generated by blankServer or is switched to an external TTL blanking input from the secondary for beam switched observations and logically inverted as needed Page 20 of 32 Supercam at APEX ICD e cryoMon runs on supercam8 and provides an interface to the Lakeshore 208 temperature monitor that reads the DT470 silicon diodes inside the cryostat Basic communication with these serve
17. cryocoolers are used to provide cooling stages at 50K 15K and 4K The first a CTI 350 cold head is driven by a CTI 8200 helium compressor located at a distance up to 20m away Two 0 5 diameter helium lines with 0 5 self sealing Aeroquip fittings are used to provide supply and return gas to the cryocooler head The second a sumitomo Heavy Industries SHI RDK 415D is driven by a CNA 61C helium compressor which is itself split into an indoor electronics unit and an outdoor compressor amp fan unit Each module has 10 meters of 1 diameter helium transfer line with 0 5 Aeroquip fittings combining to 20 meters Both compressors are air cooled and require no additional interfaces for cooling Based on the low atmospheric pressure at APEX 525 mbar care must be taken that the compressor outdoor unit not be subjected to ambient air temperatures above 20C for operation This implies a sun shade The footprints of the compressor modules are shown in Table 2 5 below We anticipate that all compressor modules can be installed on the instrument platform near the other APEX heat exchangers The ARTEMIS helium lines extending through the cable wrap from the compressor loft to the C cabin use 3 4 12 series couplings Supercam uses 1 2 couplings 8 series We will make 4 adapters to allow mating to the ARTEMIS lines for the CTI compressor a stub with 1 2 female 5400 S5 8 coupling brazed on one side and a 3 4 male 5400 82 12 coupling brazed on th
18. ct power control of an ethernet controlled 8 port AC power distribution box which allows independent subsystems to be turned on and off remotely This will allow the system to be powered down in a controlled fashion in the event of power loss It further allows the system to be brought up remotely in a controlled fashion The Supercam UPS will be programmed to power up after a power loss only once the batteries are recharged or under manual intervention Figure 4 2 top UPS system selected for Supercam electronics is a 2U rackmount system with 230VAC capability and a remote managed interface Only the top 2U unit will be used the bottom module in the figure is an add on battery module for extended runtime bottom The back face shows the connectors needed to interface with the APEX power system Schuko to IEC cable adapters are baselined Page 17 of 32 Supercam at APEX ICD Schuko CEE 7 7 plug Schuko CEE 7 7 plug 29m IEC 320 C13 receptacle 2 5 IEC 320 C14 plugs 10m NEMA 5 15 receptacles Synaccess AC switch supercam9 acquisition PC lm NEMA 5 15 plugs FFTS IF processor iu NEMA 5 15 plugs NEMA 5 15 plugs bias LO electronics 320 C13 receptacle fans misc Figure 4 3 Block diagram of power distribution system for Supercam 4 4 TOTAL POWER CONSUMPTION Table 4 2 summarizes the expected breakdown of power consumption after the transformation of as many components as poss
19. dle Maximum displacement of the structure is less than 0 1 mm Safety factors exceed 20 everywhere Maximum displacement of the structure is 0 2 mm Safety factors for both structures exceed 20 in most regions bottom Zoom in on the highest stress point in the model the edge of an octopod plate The point stress can be eliminated by placing a radius at the corner of the plate bringing the stresses to 3 kpsi and bringing the safety factor above 5 Page 8 of 32 Supercam at APEX ICD The main structural limitation of the Supercam mechanical assembly is not the main structure itself which 1s clearly designed to the much more stringent optical tolerances Rather it is the thread strength of the fasteners which is the limiting factor The cryostat is supported with 4 x 3 4 16 bolts to the four vertical cryostat supports with L brackets and 74 20 bolts providing additional support at the top of the cryostat The vertical members are attached with a T interface to the Secondary Support Ring using 6 x 3 8 bolts each 24 total The 8 octopod supports mount with 4 x 3 8 bolts to the Secondary Support Ring and to the Invar Ring with 13 x M12 bolts Maximum Deflection Maximum stress Safety Factor 0 1 mm at zenith Up to 1 6 kpsi gt 20 zenith 0 2 mm at horizon Up to 5 kpsi horizon gt 6 horizon Table 2 2 Summary of load analysis of main structural members See Figure 2 4 for details Bolt set Thread
20. e other Helium line arrangement to be deployed 15 shown in Figure 2 5 below instrument platform cable wrap to C cabin CNA 61C Outdoor unit 5m Sumitomo 5m Sumitomo extension extensi n 10m 10m 1 2 male to female 1 2 male to female Sumitomo lines 10m Sumitomo extenson CTI 8200 EES ERE ES SERB ERR ERS Artemis lines 3 4 couplings existing 5m CTI line 3 4 male to 1 2 female 3 4 male to 1 2 male Aeroquip adapters Aeroquip adapters Figure 2 5 Helium line arrangement to be baselined for Supercam s APEX integration Portions in green must be purchased by the Supercam team the orange portion represents the Artemis lines Page 10 of 32 Supercam at APEX ICD Compressor Dimensions Weight Power Environment Unit cm kg CNA 61C 63 x 27 57 45 208V 40A SC to 35C indoor 8 0 kW 50 Hz 9 2 kW 60 Hz CNA 61C 91 x 103 x 39 115 From indoor unit 30C to 45C outdoor CTI 8200 51 x 43 x 57 70 230V 1 910A 0C to 40C 2 kW rms Table 2 5 Supercam helium compressor specifications Figure 2 6 Conceptual diagram of an isolation mount
21. ek 49 2014 Week 50 2014 Week 51 2014 13 114 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Brian Duffy Paul Schickling Brandon Swift Ruben Dominguez Craig Kulesa Jenna Kloosterman Bill Peters Caleb Wheeler Umut Yildiz Jorge Pineda unpack Nro assemble amp test install prepare for install observe commission Figure 8 1 Supercam deployments color coded by speciality Gray mechanical and installation Blue instrument hardware Red instrument software and data systems 8 3 OBSERVING RUN PRINCIPAL INVESTIGATORS Responsible for the detailed planning and documentation of the awarded observing time PIs will work with APEX staff and the Supercam instrument team in assuring that the observations planned are compatible with the facility and instrument capabilities Any instrumental deviations need to be coordinated with the instrument team with the greatest possible advanced notice e g tuning to a line other than CO 3 2 Page 28 of 32 9 MASTER TABLE OF INTERFACE CONTROLS Interface Type Interface From Interface To Description Other Information Rack Mount 2 Mount M12 bolts and e frame Cabinet Compressor Instrument Compressors BEES isolation mounts Mount platform Optical relay APEX f 8 focus Supercam 1 5 2 refractive lens relay Removed for A cabin ops
22. equency computed by APECS The sky frequency should include the Doppler correction for the antenna velocity and the observer s catalog V sa 10MHz Command reference amp Control 10 65 GHz 42 6 GHz 340 8 GHz 10 12 GHz YIG Synthesizer Figure 5 1 Block diagram of Supercam LO subsystem IF OUTPUTS AND THE SUPERCAM FIDUCIAL PIXEL Supercam performs its own IF processing independent of APEX The IF chain is comprised of a series of 8 channel IF Processor modules which amplify and filter the 64 IFs from the cryostat downconverting from 4 6 GHz to the baseband signal 0 500 MHz 10 dBm required at the input of a 16 GHz wide digital FFT spectrometer FFTS 64 output IFs are power combined into 32 FFTS inputs yielding 256 MHz of bandwidth per Supercam pixel in 1024 channels In reality the edges of the spectra are trimmed because of overlap in the power combined region typically 900 channels over 240 MHz of bandwidth While IF independence is important for Supercam it increases the effort needed to perform basic commissioning and observing To this end it is advantageous to split one pixel from Supercam to provide a facility IF that can be used for basic pointing and focusing operations In essence this so called fiducial pixel presents a standard single pixel interface so that Supercam looks like a normal receiver to the facility A diagram of the fiducial pixel IF that the Supercam team will make av
23. erywhere Page 7 of 32 Supercam at APEX ICD Model name Dewar Support Structure FEA 4 2x4 legs Study name Study 1 Plot type Static nodal stress Stress Global value 6 34131 006 to 12486 psi von Mises psi 124860 114455 104050 9 364 5 8 324 0 j 7283 5 3 6 243 0 LZ N d 5 2025 31215 a 2 081 0 Eom 1 040 5 0 0 8 Value 2 2 psi Walue 2 4 psi Max 12 485 0 13520 psi URES mm 0 01511 mm 0 17193 0 15761 0 14328 0 12895 0 11462 0 17193 a 010028 4 0 07164 t 9 0 04298 LI 0 01433 y 7 Y 0 00000 Min 0 00000 011570 Value 0 11876 0 02673 mm Model name Dewar Support Structure FEA All Study name Study 1 Plot type Static nodal stress Stress Global value 4 762316 006 to 12057 3 psi 694 1 psi von Mises psi 12 057 3 1453 3 psi 11 052 5 100477 9043 0 8 038 2 70334 6 028 6 5 023 9 I Value 1 175 7 psi 40194 2299 psi Max 12 057 3 Value 8029 psi Value 1 1742 psi Value 910 3 Figure 2 4 Finite Element Analysis FEA of the Supercam mechanical mounting structure pointed at horizon top von Mises stress plot shows that the highest stress is at the octopod tubes attached to the Secondary Support Ring mid
24. evel of planning and performing the science observations the Chilean Swedish and ESO time will be each carried out in a Service mode This reduces the need for several observers from the Supercam team to be present once commissioning ends however it is important for 1 2 members of the Supercam team to be available to process the data in real time and work with the ESO and OSO observers to verify that good data are being taken and that the target goals of the observations are being achieved Furthermore to best prepare for the run it 1s suggested that ESO OSO Chilean PIs and observers work with Supercam team members to examine the awarded proposals write up a general guideline for using supercam at APEX submitting catalogs observing modes updates on performance etc and optionally contact PIs to solicit and answer any program specific questions Once the instrument is commissioned and observing appears to be proceeding smoothly then perhaps only one or two Supercam personnel need to be at the summit or at Sequitor The role of these individuals would be to specifically support Supercam follow the data taking and processing very closely and manage any issues that might arise APEX STAFF Responsible for the overall management of the run and helping coordinate the Instrument team and observer PIs to allow the run to be efficiently scheduled and executed The APEX station Manager has the final say in all matters involving the APEX facility
25. focus AC power 1 Instrument rack Supercam UPS 230VAC 50 Hz Schuko to IEC Supercam electronics AC power 2 120VAC inverter 120VAC to fans and incidentals Subreflector C cabin DB15 Supercam 5 7 meter DB15M to coax Delayed SYNC and BLANK C amp C Software apex2hht APECS SuperComm Python script running on Supercam events observer3 Listens for Supercam events and communicates messages to Supercomm MBFITS reader 1 level MBFITS Level 1 processor Read list of antenna positions for For supercam pipeline files for supercam interpolation Data Flow Data stream Supercam FFTS FitsWriter TCP stream of Supercam FFTS For APEX pipeline SCBE data ethernet APEX Supercam switch Cat5 or cat6 with RJ45 termination Single static IP address to supports supercam s internal network on 192 168 1 x and 192 168 2 x Page 29 of 32 Supercam at APEX ICD Appendix A Approval Signature Date Print Name Title Role Signature Date Print Name Title Role Signature Date Print Name Title Role Supercam at APEX ICD APPENDIX B REFERENCES The following table summarizes the documents referenced in this document Document Name and Description Location Version http loke as arizona edu ckulesa binaries superc am integration APEX Supercam Implementation V1 5 12 September 2014 APEX MPI MAN 0011 V3 0 21 July 2014 APEX MPI ICD 0005 V1 0 29 March 2006 APEX MPI ICD
26. for Supercam s compressors Sandwiched between two aluminum plates is a soft rubber plug with 1 4 20 threaded center Ratchet type hooks will tie into the grating floor on the instrument platform Facility UHP helium should be available to charge compressors and helium lines The static pressure for the CTI 8200 15 1 7 MPa 250 psi and the CNA 61C 15 1 65 MPa 245 psi Page 11 of 32 Supercam at APEX ICD Service loop for elevation Line routing through B Cabin movements Protective housing attached to the B Cabin He line is fixed to C Cabin floor Rotation is handled in the B Cabin Figure 2 7 Diagram showing the C cabin tie downs and routing pattern of Supercam s Sumitomo helium lines The right hand drawing shows the clearance of the helium lines through the MKIDS instrument area Constraining the helium lines in the B cabin remains a work in progress and a detailed model of the B cabin installation is required 2 3 SUPPORT ELECTRONICS RACK coarse outline of table footprint FFTS Hammond box 3U IF rack IF processor 9U on table 18U DC rack on floor 12 15U clearance needed entrance doorway i cryostat floats above table IF rack is an open frame server rack table height just clears M3 Figure 2 8 Left Overhead diagram of Supercam electronics installation options atop or adjacent to the M3 protection table Right Conceptual structural support for electronics rac
27. h to the 230 GHz receiver SHFI s APEX 1 in the A cabin We have baselined a mechanical structure that can support operation of the APEX optical swing arm assembly with the temporary removal of one structural member of the Supercam mount Automatic operation of the swing arm must be disabled it must only be done at stow and under direct manual control The nominal procedure 1s expected to be 1 Stow telescope and remove one A cabin or both B cabin removable Supercam vertical truss supports Use of the swing arm also requires removal of the Supercam LO beamsplitter and sky lens mounts and should only be done by Supercam personnel B cabin operation is not being supported for the Novermber December 2014 run but can be discussed for a hypothetical second run if it materializes 2 Remove beamsplitter mount and upper Supercam lens 3 Move swing arm into position 4 Reinstall Supercam vertical support and unstow telescope for operation Figure 2 2 illustrates the setup for A cabin and C cabin modes and Figure 3 1 shows the A cabin mirror in position from the top Page 13 of 32 3 2 3 3 Supercam at APEX ICD Figure 3 1 Illustration of the A cabin swing arm in position surrounded by the 4 vertical Supercam cryostat Supports TWO POSITION CALIBRATION LOAD A rotary stepper motor actuator will be used to insert an aluminum disk lined with multiple layers of eccosorb AN 72 into the beam for calibration
28. ible to 230 VAC power The listed peak power consumption represents the inrush current applicable for lt lt 100 ms if all devices are switched on at the same time This value is useful for defining the fuse rating s for Supercam s AC circuit s Subsystem 1 phase 230 VAC 50 Hz 3 phase 208 VAC 50 Hz Power Requirements Power Requirements SHI CNA 61C 4K 8 2 kW avg 11 kW peak CTI 8200 15K 2 1 kW 2 8 kW peak Support electronics 1 500W avg 700W peak 230 VAC native Support electronics 2 900W avg 1500W peak Transform to 115 VAC TOTAL 3 5 kW 5 0 kW peak 8 2 kW 11 kW peak Table 4 3 Overall breakdown of Supercam s power consumption including transformer losses Page 18 of 32 Supercam at APEX ICD o RF INTERFACES 5 1 5 2 5 3 10 MHZ REFERENCE The Supercam LO system and the downconverter module for the 64 channel IF processor both require a 10 MHz reference source to be provided by the facility s GPS station clock The power level required is 6 13 dBm 7 5 dBm 15 the current measurement of the power level available The Supercam team will bring a low frequency amplifier as backup SYNTHESIZERS As shown in Figure 5 1 the Supercam LO system operates fully independently of the supporting telescope We will continue this mode of operation at APEX For successful operation the Supercam Command and Control system needs access to the sky fr
29. ing Run Principal 28 9 MASTER TABLE OF INTERFACE CONTRODLSS eee eee eee eerte nnne eese estet etna soos eee eoo 29 1 OVERVIEW 1 1 SCOPE AND PURPOSE OF THIS DOCUMENT This ICD aims to document and track the information required to define the Supercam system interface to the APEX telescope It will relate inputs and outputs from Supercam for all potential actions This will give all parties guidance on the architecture of the system to be integrated in November 2014 and help ensure compatibility between system components A Q emblem identifies critical questions that still needs to be addressed 1 2 DESCRIPTION OF INSTRUMENT PACKAGE APEX mounting ring 2 position m chopper i wheel 2 element refractive optical relay LO power module 10 100 Mbit Ethernet Switch Data PC onitor coldhead controller 208 VAC 3 phase Cryostat 2 1 kW Facility 4 ethernet z 24150 hbanuannsuuauuauuauzuzuun c 20m lt gt helium supply return lines 208 VAC 1 11 3 phase 8 kW 50 Hz PPP PPR RRR 9 2 kW 60 Hz liu supply return lines CNA 61C outdoor unit Figure 1 1 Overall block diagram of the Supercam instrument on APEX Supercam is a 64 beam heterodyne array that operates between 300 and 4
30. istributed object DO model used at APEX as canonized in the current APEX Control System APECS through DOs defined by IDLs communicating through CORBA at the high level and SCPI at the hardware level We will augment SuperComm with a python based SCPI to socket messaging layer with an HHT like output messaging interface In Figure 7 1 this module is shown as apex2hht Here we leave SuperComm mostly intact and only add a SCPI layer to scan for APEX messages involving Supercam transform them to their HHT equivalents and rebroadcast them via socket server messages to SuperComm Messages Needed By Supercam When an observation is requested Supercam needs the following kinds of notifications to stay synchronized with APEX We will seek 1 1 analogs of these messages to be obtained from APECS Table 7 1 indicates where these items can be found l A message indicating that an observation has been requested At this time the ability to fill an internal structure with information about the observation 1s needed from APECS observing mode object and line name sequence number catalog coordinates catalog offsets antenna EL and AZ catalog amp antenna velocity rest and sky frequencies sideband UT date time LST temperature pressure humidity subreflector focus Tcal pwv atmospheric temperature and opacity in signal image sidebands 2 A message indicating the start of a scan For all modes except OTF one of the following Integra
31. k when horizon pointing full triangular brace and correct dimensioning is underway All of the electronics needed to operate Supercam are to be installed in the C cabin in close proximity to the cryostat The M3 Protection Table will house the IF and FFTS system in open frame server racks on the ARTEMIS side of the cryostat Figure 2 5 left The DC electronics will be mounted in the current 18U half height rack and mount the LO distribution box FFTS and IF processor on the table Page 12 of 32 Supercam at APEX ICD Because of its significant weight the support electronics rack needs additional anchoring for horizontal pointing This support comes in the form of triangular metal braces that attach to the floor Figure 2 5 right Weights and dimensions of the three modules are shown below in Table 2 3 Electronics Module Dimensions cm Weight Support electronics rack 50 x 60 x 100 130 kg IF processor 45 x 45 x 60 40 kg FFT spectrometer 50 x 40 x 15 10 kg Table 2 6 Specifications for the three electronics modules to be installed in the C cabin 2 4 TOTAL INSTALLED WEIGHT INTO C CABIN Module Weight kg Cryostat U mount Optics Subsystem 420 Support Electronics Modules 180 TOTAL 600 Table 2 7 Total weight installed into C cabin 3 OPTICAL INTERFACES 3 1 OPERATION OF SWING ARM FOR A CABIN AND B CABIN During poorer summer weather at APEX it may be necessary to switc
32. ne support can be removed for installation of the instrument and for operation of the APEX swing arm The removable support will only be removed at the stow position and only for brief operation of the swing arm 3 An extruded aluminum subframe that directly attaches to the cryostat to provide mounts for all Supercam optical elements sky beam reimaging lens Local Oscillator LO imaging lenses LO mount 4 An M3 Protection Table to be initially installed to allow work on Supercam without impact to the LABOCA M3 mirror It will also be used for mounting of the Supercam IF system and to provide staging support for the cryostat during its installation into the U mount Page 5 of 32 Supercam at APEX ICD Figure 2 1 Diagram of Supercam installed into the APEX C cabin The cryostat is supported from above via the U mount and Secondary Mounting Ring and its supporting electronics are attached to the floor Figure 2 2 Cut away of Supercam in the APEX C cabin showing the APEX swing arm in the A cabin left and C cabin right positions A single vertical support is removed from the Supercam mount to allow the arm to be operated then reinstalled once the swing arm is in place Page 6 of 32 Supercam at APEX ICD Design Loads Limits and Structural Analysis FEA and fastener analysis was performed on the Supercam mechanical assembly to assess structural integrity In response to Action Item 009 from Michael Cantzler After
33. prompt when the load is in position and advise when the load should be removed Page 14 of 32 Supercam at APEX ICD 3 4 SKY BEAM OPTICAL RELAY The f 8 beam directly arriving from the APEX secondary will be relayed to the Supercam focal plane by two anti reflection coated lenses Because the cryostat was lowered to allow use of the swing arm the lower lens can no longer be used as a replacement for the cryostat window It now resides atop the beamsplitter mount UHMW polyethylene will be used as the lens material and the AR coating will be an 8 mil thick sheet of Zitex G108 45 pore volume with thin LDPE film to be heated as the glue layer The master reference for coating HDPE with Zitex is Hargrave amp Savini 2010 Proc SPIE 7741 Cardiff group http loke as arizona edu ckulesa binaries supercam optics Hargrave AR Coat HDPE pdf T he combination of absorptive and reflective losses is not expected to exceed 8 in either lens and while slightly lossier than a reflective system will provide the very simplest opto mechanical interface to the APEX telescope Figure 3 2 Zemax rendering of Supercam optical relay from f 6 Cassegrain focus i to f 5 focal plane subreflector 4 ELECTRICAL INTERFACES 4 1 COMPRESSORS amp TRANSFORMERS The electrical requirements for the CTI and SHI GM cryocooler compressor units are shown in Table 2 1 a total of 50A at 208 VAC 50 60 Hz 3 phase and about 15A
34. r run interactively by the observer offline Two Level 2 pipeline options will be available one using CLASS and another using a Supercam specific rework of ATNF s Gridzilla package These will be the supported options for science PIs using the standard Supercam pipeline What will be provided at APEX By default the standard Supercam pipeline through Level 1 data 1s fully operational and can already be used with appropriate APECS notifications and headers Section 7 1 2 to feed the data archive at Sequitor with Supercam SDFITS data ready to baseline and regrid into Level 2 maps This strategy 1s also compatible with the limited manpower on the Supercam team that would be needed to implement a new data system However this approach comes with a disadvantage it 1s foreign to the standard APEX data interface and archiving system It comes with different reduction software requirements and different data formats and 1s unlikely to match the expectations of seasoned APEX science PIs The Supercam team does not have the resources to re engineer a new data acquisition system based on MBFITS when the current system works very well with simpler SDFITS However a compromise may serve some portions of the APEX audience better a parallel datastream Figure 7 3 Here Supercam s Level 0 processor scooper will also provide a raw binary datastream comprised of 64 x 900 channel IFs directly to apexOnlineFitsWriter For the configuration of the Superc
35. review of antenna documentation and consultation of Vertex Duisburg the design limits shall be defined by the estimated worst case accelerations of an earthquake scenario The corresponding values are given in the table below Direction Acceleration g Safety Factor Design Limit Vertical 1 80 2 0 3 60 Horizontal 2 0 2 30 Table 2 1 Defined load limits per AI0009 Because the allowable bending of the structure is most stringently defined by the optical tolerancing it very naturally provides a very high degree of safety in overall integrity The FEA analysis begins at the invar ring assuming that it is fixed and determines the stresses and deflections of the Supercam structure from gravity at two elevation angles zenith and horizon The worst case deflections are naturally present when pointed at the horizon Figure 2 4 The deflections and structural safety factors assuming A500 A36 structural steel for the entire assembly and are shown in Table 2 2 Min 0 00000 I Value 0 00378 0 00000 Max 0 02717 Figure 2 3 Finite Element Analysis FEA of the Supercam mechanical mounting structure when pointed at zenith left von Mises stress plot shows that the highest stress is at the octopod tubes attached to the Secondary Support Ring right Maximum displacement of the structure is less than 0 1 mm Safety factors exceed 20 ev
36. rs can be done interactively from the command line via telnet Or netcat to a particular server interactively by GUI or non interactively via higher level scripts or programs Supercam is to be operated through a series of single purpose scripts which can be invoked through a master GUI Engineering level GUIs for single pixel adjustments will be provided and monitoring of the instrument through the master GUI or a remote web page is the expected mode of operation at APEX However all observing sequences operate through higher level glue logic interfaces that monitor the state of the telescope and observing and keep Supercam s operation in sync This logic 1s held within SuperComm the recipient of observing messages from the HHT Using an orchestral analogy SuperComm acts as the central conductor who keeps the various socket servers playing on time and in tune Its sidekick Monitor harvests information from the various socket servers to maintain knowledge of the current state of the instrument In its software implementation for the HHT Supercam 15 passive to the underlying telescope control system it only receives messages and never sends commands It only sends unsolicited messages to the log system when it is having difficulties and wants to notify the cognizant observer or telescope operator We anticipate the same interface at APEX we si cryoMon biasServer TCP socket server port 9001 on supercam 1 8
37. s shown in current drawings it does not provide significant structural support The baseline development plan leaves the LABOCA M3 mirror in place and undisturbed a protective table will be installed over the mirror to help support the cryostat during installation and can support the instrument support electronics during operation The baseline plan also permits manual operation of the A B C cabin swing arm assembly at zenith only and under physical supervision as at least one Supercam mechanical support must be removed to allow the arm to swing into position Utilization of the A cabin will be explicitly supported 1n November and B cabin operation can be supported beyond that timescale if requirements are requested well in advance Design Principles The Supercam mechanical support system 1s comprised of four assemblies 1 An octopod open structure using fixed supports extending from the APEX invar mounting ring to a smaller diameter Secondary Mounting Ring that directly supports the instrument This Secondary Mounting Ring decouples the location of dewar supports from mounting points available on the APEX invar ring as the two are not naturally coincident 2 A substantial U shaped support structure that holds the cryostat in place using four main supports that allow operation of the APEX A C cabin optical swing arm assembly These supports provide distributed support to Supercam secondary ring and crucial rigidity at all zenith angles O
38. strength Max Load Safety Margin Lower Cryostat 4 x 3 4 20000 Ib ea 160 Ib ea 100 Upper Cryostat 16x3 8 3600 Ib ea 50 Ib ea 75 Lower Ring 32x3 8 3600 Ib ea 25 lb ea 150 Upper Ring 13xM12 7200 Ib ea 75 lb ea 100 Table 2 3 Fastener analysis assuming uniform load distribution at ZENITH Bolt set Thread stress Max stress Safety limit Margin Lower Cryostat 4 x 3 4 30 kpsi 2 kpsi 15 Upper Cryostat 24x3 8 30 kpsi 3 kpsi 10 Lower Ring 32x3 8 30 kpsi 8 kpsi no clamps 3 75 4 kpsi clamped 7 5 Upper Ring 13xM12 30 kpsi 10 kpsi no clamps 3 5 kpsi clamped Table 2 4 Fastener analysis assuming asymmetric load distribution at HORIZON These loadings are based on the direct moment arm calculation and upon the FEA stresses at specific points in the structure To improve safety margin at the invar ring clamp fixtures will be added to the invar ring between the M12 bolts to reduce the tension load and eliminate any possibility of thread stripping or shearing Page 9 of 32 2 2 Supercam at APEX ICD A summary of the fastener analysis is shown in Table 2 2 and 2 3 for zenith amp horizon pointing Grade 5 imperial and grade 9 8 metric bolts are assumed for analysis though we intend to use grade 8 and grade 10 9 where possible The thread strength conservatively assumes the yield strength as the starting point not the ultimate tensile strength COMPRESSORS AND HELIUM LINES Two Gifford McMahon
39. te for x seconds on SIG REF Sky Vane Cold Load For OTF we look for two messages Prepare for OTF raster of length x seconds followed by a Start Ending the scan requires either a successful complete message or an abort 4 Before and during observations other messages that impact Supercam might be Antenna On Off Target or Antenna in BEAM or BEAM position 5 For OTF mapping Supercam needs a way to receive a stream of antenna telemetry of RA and DEC Implementation While Table 7 1 shows where the needed scan information can be harvested the highest challenge 15 figuring out how to get this information to Supercam in time to synchronize observations and inform the Supercam pipeline which wants this information in advance Dirk Muders has kindly provided a Virtual Machine for APECS that will allow the Supercam team to characterize the system and test the integration of the Command and Control software We are experimenting with observing sequences and beginning to integrate the system Furthermore the core of the apex2hht module will be a short script that Dirk has written for us monitorSupercamScans py which listens to the Observing Engine from observer3 and Page 22 of 32 Supercam at APEX ICD reacts to events pertaining to Supercam and the Supercam Backend which shows up as SCBE in APECS It harvests messages about the scan preparation phase including scan details such as mode type
40. will make all final decisions on the implementation and perform risk assessments for the continued safety and operation of the facility APEX will provide documentation of existing hardware and software systems so that the Supercam instrument team can implement a working interface plan in advance of shipment APEX is responsible for the processing and archiving of data written outside of the supported Supercam pipeline such as to apexOnlineFits Writer SUPERCAM INSTRUMENT TEAM Provides the Supercam instrument and is responsible primarily for its installation and commissioning at APEX The laboratory team will prepare the instrument to the specifications of this ICD and prepare the deployment team with its full operation and be available for remote and online support The laboratory team will help provide guidance for observer PIs in planning observations The deployment team will unpack and test the instrument to the greatest extent possible in the telescope laboratory at APEX before installation into the C cabin This staging effort will occur outside of the APEX telescope well prior to the start of November run so that installation downtime may be as short as possible The Supercam team is responsible for the instrument standard Supercam pipeline its data products and archiving A draft schedule of the Supercam deployment team is shown below in Figure 8 1 Page 27 of 32 Supercam at APEX ICD Name Week 47 2014 Week 48 2014 We
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