Operations Manual - National Optical Astronomy Observatory
Contents
1. C KOSMOS Operations Manual Authors C KOSMOS Operations Manual V1 3 Sean Points J ay Elias Paul Martini Revision History Version Version Date Description Authors 1 0 JE April 2 2014 Initial draft assembled from prior documents authors as above 1 1 JE July 9 2014 Various edits 1 2 JE Sept 17 2014 Minor edits correlate with User Manual V1 4 1 3 JE October 7 Add KOSMOS dewar alignment 2014 photo other alignment info update on instrument start up amp troubleshooting Page 2 of 45 C KOSMOS Operations Manual V1 3 Table of Contents 1 2 3 4 5 Introduction and PUrpoOSe s sessssssssessrresrrresrinssrrnsrrrtnrrntsrrntsrrtsrrtsrrntsrrnesrresreree 4 SOE a ana aa sae aces a E E EA EAE A EAEE AE es 6 C KOSMOS Installation and Removal ssssssssssssrsesrrsesrrnesrrnssrresrrresrrresrreesrresrrree 14 31 C G KOSMOS Installaatio Mes sutatecrsaies cthunees made a a AN sinh a E airi 14 3 1 1 Preparation for Installation s nssnnsnnesnnsrrnsrnsrrnrrnnrrrrrrerrrsrrnrrnsrrnrrnns 14 3 1 2 Installation on Telescope sists esvaanssecgaesssecmavaiveiseiardsuariwataventesdianvresyauies 17 3 2 Instrument Removal s ccinnarianaie aracari an a n 21 3 3 Dewar and Controller TNStallalonccc mwiszteiaweed dai eiieiaawaineiiare ns 21 33 1 Dewar Preparation sess engsnnonn an e a a ts a 22 3 3 2 Dewar IMStal AON caxteaacwostnreerctmacenetecanspupecesenietaacnsu2. and will then start flowing into the dewar Some dripping from the fill fixture is normal at this point You can open the valve to the storage dewar more fully at this point Once the dewar is full typically about a couple of minutes liquid will start to spill out of the holes in the side of the fitting Close the valve Page 35 of 45 C KOSMOS Operations Manual V1 3 If you are in the lab or have time you can wait for the fitting to warm up and remove it by hand Otherwise you will need wrenches to do so a ways use two wrenches for this in order to protect the dewar neck For lab work it is not necessary to remove the nitrogen line The procedure for KOSMOS is generally similar see Figure 13 for a view of the fill fitting However the hold time is substantially less than for COSMOS about 15 hours Therefore the dewar must be filled twice a day generally at the start of the night and at the end of the night Page 36 of 45 C KOSMOS Operations Manual V1 3 6 Dewar Alignment The dewar rotation should be adjusted using the following procedure 1 Loosen the screws holding the dewar to the back of the spectrograph the screws holding the alignment pin plate to the adapter and the micrometer and screw that engage the alignment tongue see Figures 8 and 9 Slotted attachment point Alignment pin amp plate Alignment feature attachment point Figure 16 View of COSMOS mounted on instrument showing the microm
3. KOSMOS Operations Manual V1 3 though not very useful to define a filter that is actually two filters in the light path e Make sure there is an open position in the wheel and that it is called Open You can change which physical location in the wheel this is e Save the file e When you ve made all the changes type bin change_hardware to update the NOCS Starting the NOCS automatically uses the updated files so the change_hardware command isn t required e f you want to verify that everything is correct open the NICS window see section 3 2 of the User Manual and confirm that the filters and slits displayed there are what you expect you can then try moving to the position of one of the new items enable command buttons to do so For reference the configuration file for the dispersers is located in the same directory and would be edited in the same way if dispersers are added or changed at some point in the future Also as indicated in the Users Manual the configuration file for the camera focus is located in this directory If the focus setting is being updated it is simpler to follow the procedure in the User Manual where you manually set the desired focus after a focus check and just update the file However the hardware update command will also apply the new focus value Page 45 of 45
4. Page 8 of 45 C KOSMOS Operations Manual V1 3 Hazard Hazard Description Hazard Reduction Mitigation Name Cryogen The detector dewars 1 The dewars are standard Hazards use liquid nitrogen observatory dewars for which Cryogen burns are appropriate cryogen safety procedures possible suffocation is have been established KOSMOS and possible but unlikely in COSMOS will follow the standard the dome environment procedures 2 A fill tube extender will be attached to the dewar to provide better access e g at the side of the instrument or near the cage door Electrical The instrument The hazardous voltages are only Hazards electronics box exposed by removing covers Safety contains standard AC labels will be provided The electronics line voltage box can be disconnected from power if required Slew Hazard The user software can In practice large motions never occur request telescope if requested they will not be performed motions large motions as slews high speed slews can be hazardous if executed unexpectedly Trip Hazard Cables between Cables should run across floor of cage connectors on the cage wall and the instrument can pose a trip hazard if not secured properly tripping may damage the cables as well as injure people under a cable protector Mayall or in troughs under the floor Blanco However the cables must be secured with enough slack to permit operation of the r
5. description of the instrument and how it is used while observing Page 5 of 45 C KOSMOS Operations Manual V1 3 2 Safety This section summarizes safety hazards associated with KOSMOS and COSMOS and describes the procedures and design modifications that have been adopted to reduce or mitigate these hazards Unless indicated otherwise all descriptions of hazards and mitigations apply to both instruments The tables below contain a column identifying the hazard a column describing the hazard in detail and a column describing the mitigation for that hazard The first table comprises hazards posing a risk to personnel these hazards may also pose a risk to equipment The second table lists hazards that only pose a risk to equipment For some hazards safety labels are provided as part of the mitigation Subsequent sections in this manual will provide documentation on associated handling procedures this document will be included as part of such manuals In addition mountain staff will be trained regarding instrument safety as part of the commissioning and acceptance of the instrument at each observatory site This document is not intended as a substitute for training and any potentially hazardous procedures should not be carried out by un trained personnel General observatory safety procedures are not covered in this document but should be followed at all times These include use of safety harnesses while installing equipment using the
6. mirror lift Note this section of the manual replaces the KOSMOS COSMOS Safety Document which was last revised March 13 2014 Note the list of labels should be cross checked against the individual instruments and implemented where any are missing Page 6 of 45 C KOSMOS Operations Manual V1 3 Personnel Hazards Hazard Hazard Description Hazard Reduction Mitigation Name Instrument The instrument plus 1 A suitable handling cart is provided Weight adapter have a which includes provisions for combined weight of 600 lb installation removal on the telescope 2 Installation and removal procedures will be documented these are by design very similar to those for existing NOAO instruments 3 Procedures for instrument disassembly will be documented However disassembly is expected to occur infrequently less than once year Tip Hazard on Cart The instrument must be located on the cart at a height suitable for installation on the telescope and for servicing which raises the center of gravity The cart design includes a steel baseplate intended to ensure that the cart will not tip over even if tilted 30 degrees exact tilt TBC The cart caster locations have been moved to increase footprint Cart casters are spring mounted and appropriately sized Page 7 of 45 C KOSMOS Operations Manual V1 3 Hazard Hazard Description Hazard Reduction Mitigation Na
7. of 45 C KOSMOS Operations Manual V1 3 w Figure 5 View from below of KOSMOS after installation The cradle has been left attached to the instrument Note safety harnesses attached to the mirror cell bottom top left lower right Now move the cage bottom onto the lift raise the lift and attach the cage bottom according to standard procedures Note The cage bottom can be attached either after or before installing the CCD dewar and completing cable connections at present it appears to be preferable to install the dewar itself first but complete any cabling steps after installing the cage bottom Once installation of the instrument is complete the mirror lift should be lowered and the cart and instrument cover should be stored Dewar alignment This procedure is not required if the dewar adapter ring has been left attached to the dewar However it does no harm to verify alignment if there is any doubt The critical parameter for dewar alignment is rotation where the slit should be aligned parallel to the short axis of the CCD which may be either rows or columns depending on the CCD used See section 6 for details of this procedure Page 20 of 45 C KOSMOS Operations Manual V1 3 3 2 Instrument Removal The procedure for instrument removal is the reverse of that for installation It is not necessary to remove the CCD dewar but it may be desirable to do so if the instrument will not be used for a long time and the dewar n
8. performed by trained observatory personnel not by observers Page 10 of 45 C KOSMOS Operations Manual V1 3 Hazard Hazard Description Hazard Reduction Mitigation Name Optics 1 The instrument 1 There is a dark slide at the front of Hazards entrance port is up the instrument that should be closed Exposure looking and dirt when the instrument is not in use i e water and small during the day or when not installed on objects can enter and the telescope The cover can be contaminate or accessed for debris removal through damage optics the guider when the instrument is on 2 The instrument rear the telescope port is open when the 2 There is a cover for the rear of the dewar is removed and instrument that should be installed dirt water and small when no dewar is installed The cover objects can enter and attaches to the side of the instrument contaminate or when not installed so it will not get damage optics lost 3 There will be labels for the dark slide and the rear cover 4 The covers and electronics boxes are not necessarily fully hermetic and water can occasionally drip in the coud lab storage area so a cover for the instrument will also be provided for use when off the telescope This will provide additional dust protection Optics The instrument is 1 All exchanges will be performed by Hazards designed to allow slit trained observatory personnel Handling masks filters a
9. removed top The 4 clamps can be seen around the inner edge of the holder Alignment pins can also be seen at approximately the 6 11 and 12 o clock positions A close up is shown bottom where you can see the clamps and alignment pins Page 40 of 45 C KOSMOS Operations Manual V1 3 The KOSMOS masks are cut from stainless steel shim stock that is coated black on one side One such mask is shown in Figure 20 below COSMOS masks are cut either from aluminum shim stock that is blackened on both sides or a thin carbon fiber sheet The general appearance for the COSMOS masks will be similar to those for KOSMOS except that neither side will be shiny The black side of the KOSMOS masks faces the collimator to reduce ghost images While both sides of the COSMOS masks are black the alignment pins in the mask holders ensure that the orientation is always correct Figure 20 Typical multislit mask The mask should be inserted in the holder making sure to align the holes in the edge of the mask with the alignment pins If this is done correctly the shiny side should be down for correct alignment For COSMOS masks where there is no shiny side there is still only one way the pins and holes will line up Now install the retaining ring over the mask and alignment pins and then tighten the clamps to hold the ring in place The clamps may need a little assistance to rotate to the correct position If correctly assembled the mask in its ho
10. ring attached If the adapter ring is not attached attach it to the front of the dewar Note that this means the dewar must be re aligned rotationally after installation see below Page 29 of 45 C KOSMOS Operations Manual V1 3 The dewar should preferably already be cold at the time of installation but it can be cooled after installation this is recommended only when the instrument is installed well before any use on the telescope If the dewar is being installed without the cage bottom in place o The dewar installation fixture should be placed on a lab cart and the dewar should be clamped into it facing up The jack on the installation fixture should be lowered o The mirror lift is then used to raise the dewar until it is close to the bottom of the instrument Close means within the range of travel of the jack on the installation fixture Do not try to use the mirror lift to engage the alignment pin on the back of the instrument as it does not have the required fine motion capability and you may seriously damage the dewar or the spectrograph optics If the dewar is being installed with the cage bottom in place lower the jack on the the installation fixture clamp the dewar in place and slide the fixture under the instrument Carefully use the jack on the installation fixture to raise the dewar while guiding it onto the dowel pin Check before doing this that the hole in the dewar adapter ring matches up with this dow
11. that every wheel must have a physically open vacant position Page 42 of 45 C KOSMOS Operations Manual V1 3 e Install the access cover Figure 22 Longslits in holders left with ball driver used for installation The slit holders shown are for a centered slit top and a blue displaced slit bottom marked by the arrows The red displaced slits have the slit in the position near the handle of the holder Slit mask mounted in wheel top Page 43 of 45 C KOSMOS Operations Manual V1 3 MUUTTUNEET PTT p UL Figure 23 Filter in holder left filter installed in wheel partially rotated to Show position number scribed on the wheel top right and different view Showing filters installed in both wheels bottom right 7 3 Updating the I nstrument Configuration Now you need to update the configuration files These are in home logs The configuration file for the slits is kosmos_slits conf same name for COSMOS the file for the filters is kosmos_filters conf e Open the file for editing e f you have replaced something edit the line for the item you removed to substitute what you ve installed For filters the KPNO or CTIO filter ID goes in the last column For multislit masks the 6 digit ID goes in the last column TBC Note that the filters require that you define the position of both filter wheels normally the open position in one and a filter in the other But it is possible Page 44 of 45 C
12. OSMOS dewars which are not identical e If the noise is somewhat higher than expected i e above 10 ADU standard deviation you can try moving the location where the ground plug is plugged in to a cage power socket This may or may not help There isn t a location that is guaranteed to reduce noise below 10 ADU for either instrument At least not right now Page 34 of 45 C KOSMOS Operations Manual V1 3 5 Dewar Filling The COSMOS dewar has a hold time of 40 hours or longer it is recommended that it be filled daily but the exact time of day is obviously not critical The fill tube attaches as shown in Figure 15 do not overtighten the fitting onto the dewar neck Use two wrenches if needed to tighten the additional fittings The fill tube will be somewhat loose this is OK Put a piece of dense foam or cardboard underneath the fill tube when filling from the side in order to protect the vacuum gauge and valve If you are filling on the telescope the dewar is vertical and the foam or cardboard is not necessary If you are filling on the telescope you will also need a fitting with bend in it because there is not enough space between the dewar and the cage bottom for a straight fitting see chs 13 ioe a view of So with such a bent us arnad Figure 15 Fill fitting and nitrogen line attached to dewar Once you have attached the fill tube open the valve to the storage dewar slightly Liquid nitrogen will cool the line initially
13. a small stepladder or stool when fastening the adapter Inspection f a visual inspection was not already performed see preceding step check the mounting surface of the adapter and the area around the instrument dark slide clean is necessary 3 1 2 Installation on Telescope KOSMOS is installed on the telescope using the regular cage bottom It may be possible to use the NEWFIRM cage bottom on the Blanco for COSMOS but on the Mayall it is not possible to add enough weight to the NEWFIRM cage bottom and it should not be used At present the original cage bottom is used on both telescopes Page 17 of 45 C KOSMOS Operations Manual V1 3 Remove the cass cage bottom and whatever instrument is installed on the telescope using the mirror lift and following standard observatory procedures for those two items Lower the lift and move the instrument that was removed into its customary storage location If the rotator guider assembly was not in use it should be installed at this point following standard observatory procedures The rotator should be oriented to position angle 90 approximately for Mayall installation and to position angle 270 for Blanco installation KOSMOS installation on rotator guider Move KOSMOS onto the mirror lift Rotate KOSMOS on its cart so the access covers on the instrument are facing the location of the cage door In this orientation the electronics box will be on the right as you enter the cage No
14. cenctodacesiaumedratas 22 3 3 3 Electrical Connections and Related l c 27 3 3 4 Dewar Installation in Cage ws cassis sasaviek Oke Gees Nees 29 3 3 5 Dewar Removal and ExchanQes c eons Ani hited aes 30 Controller Operationerna eaan vant aa dentate gate Nae utnea eats 32 Ad BaSiGOPSratlO linc taste asietnuocsiveadeseduatheswevatcseiedaanea vs yeeduaesyaahuoes iadeatdenanunesyecaes 32 4 2 Troubleshooting Controller Not WoOrking cccccececceeeseeeeseeeeeeeeeaeeeeeeeeaees 33 4 3 Troubleshooting NoiSe ass ivs sadist em inewndeier tein ae ei ouahitow anes 34 D war FILING cco cctunavsty olaicd i n Gedy eal a N NO NG dri aia ad 35 Dewar Alignments Sacto dl swatabileauns nel a spall a a a alas ae aa a 37 Filter and Mask ChangeS es ssssssssrsesrrsesrrnesrrnsrrrtsrirtsrrtsrrtarrrtarrntsrrtsrrtsrrnterne 39 7 1 Installing Multislit Masks in HOIAGMS cccccceccceseceeseeeeeeeeeeeseeeeeeeeseeeeaeeeees 40 7 2 Installing Filters and Slits into KOSMOS cccccecccseeceeeeeceseeseeeeaeeeseeeeaeeeees 42 7 3 Updating the Instrument Configuration ccccccceseseseeeeseeeeeeeeeeeeeeeeeeaeeeees 44 Page 3 of 45 C KOSMOS Operations Manual V1 3 1 Introduction and Purpose KOSMOS is the Kitt Peak Ohio State Multi Object Spectrograph a visible wavelength spectrograph and imager at the 4 m Mayall telescope at Kitt Peak National Observatory This instrument was built to provide a modern high efficiency spectrograph for
15. e can usually by fixed by typing nms Reset in the xterm e Verify that everything is working by taking an image a bias or zero frame is easiest see the User Manual for details 4 2 Troubleshooting Controller Not Working When the instrument is first installed it is a good idea to re start everything including the computer racks The command to use is nocs reboot rack from the xterm connected to the KOSMOS or COSMOS rack Note that this action will close the connection so you will need to re connect once the re boot is complete This step can be omitted if the instrument has been running without problems in the lab immediately before installation but should be kept in mind if all else fails More generally if there are problems getting the detector controller to operate properly either error messages or operation in simulation mode NMSL text window shows orange background not white a careful and complete shutdown and restart is recommended but read the notes at the end of this section first 1 Issue NOCS commands nocs stop all nocs stop hardware 2 Turn off Torrent controller see above make sure shutter activates when doing this Turn off IEB instrument electronics 4 Disconnect power from the Torrent for 30 seconds controller power don t mix this up with the fan power which is separate Reconnect power to Torrent Turn on IEB wait 10 seconds or so 7 Turn on Torrent controller see above make
16. e hazard is quantified which are likely to require either powering down the CCD or implementation of a special erase mode while the instrument is being serviced including filter and slit mask changes This hazard applies only to the LBNL CCD there is no such hazard associated with the e2v CCD Cass Rotation Hazard Cables The KPNO cassegrain rotator cannot safely rotate over large angles many degrees when the telescope is not at zenith due to the design of the rotator cable wrap up Until the cable wrap up is modified all rotations greater than 1 degree will be done at zenith This restriction does not apply to CTIO Page 12 of 45 C KOSMOS Operations Manual V1 3 Hazard Hazard Description Hazard Reduction Mitigation Name Cass Rotation The cassegrain Provide appropriate ballast weight for Hazard rotators on both the instrument to ensure rotation Drives telescope may suffer moment is within specifications lt 150 drive damage if the ft lb weight design balances to 50 ft moment around the Ib rotation axis is too large Page 13 of 45 C KOSMOS Operations Manual V1 3 3 C KOSMOS Installation and Removal This section covers the installation of the instrument on the telescope its removal and the installation of the CCD dewars on the instrument This section as well as sections 4 6 includes material from two prior documents the KOSMOS Installation and Remo
17. eeds to be kept cold or requires maintenance e Disconnect the power ground and Ethernet cables for the CCD dewar and spectrograph e Bring the handling cart up on the mirror lift If the dewar is to be removed also bring the lab cart and dewar installation fixture e Remove the cage bottom lower the lift and set the cage bottom aside e f the dewar is to be removed do so at this point following the procedure outlined above e Ifthe cradle for the instrument was removed during installation attach it to the instrument at this point Note normally it would be left in place e Bring the mirror lift up so the cart is close to or touching the instrument As with installation do not bring the lift up so far that the travel of the cart casters is exceeded Make sure all locking pins are retracted Caution the forks have limited clearance around the instrument make sure they clear the instrument and do not catch or pinch any cables It may be necessary to remove cables or cable ties beforehand e Loosen the bolts attaching the instrument to the rotator guider until the instrument is resting on the cart e Engage the locking pins on the cart that hold the instrument in the vertical position e Remove the bolts that attach the instrument to the rotator guider e Lower the mirror lift take the instrument on its handling cart to the storage area and cover it You can now install another instrument or just the cage bottom 3 3 Dewa
18. el pin on the back of the instrument When the front of the dewar is nearly flush with the back of the instrument this pin will accurately define dewar rotation about the optical axis Install and tighten bolts through the adapter ring in the back of the instrument Attach the fill tube extender to the dewar fill tube and the side of the instrument 3 3 5 Dewar Removal and Exchange KOSMOS and COSMOS will eventually have 2 available dewars which can be exchanged when the instrument is mounted on the telescope The exchange can be carried out while the cage bottom is installed as described above Dewar removal The process is essentially the reverse of installation Remove the fill tube extender and disconnect the power ground and fiber cables Remove the dry air hose Lower the jack in the installation fixture and slide it under the dewar then raise the jack Loosen and remove the mounting bolts on the dewar adapter ring Clamp the dewar to the installation fixture Page 30 of 45 C KOSMOS Operations Manual V1 3 e Lower the jack in the installation fixture until the dewar is clear of the instrument e Slide the installation fixture out from under the instrument e Unclamp and remove the dewar The second dewar can now be installed following the procedures outlined under instrument installation Page 31 of 45 C KOSMOS Operations Manual V1 3 4 Controller Operation 4 1 Basic Operation The controller is normal
19. end Don t over tighten You should be able to get the end to end difference smaller than a pixel Once you are satisfied tighten the attachment screws and the alignment pin plate then take one last image to verify that nothing has shifted aS Page 38 of 45 C KOSMOS Operations Manual V1 3 7 Filter and Mask Changes Filter changes are normally performed only during the day mask changes can be carried out at night by the telescope operator but the observer may be able to help Filters or multislit masks should be installed in holders Longslits are pre assembled into holders so it s a matter of selecting the longslits to be installed Filters are installed in holders by the day crew since there are spare filter holders any filters you may have requested should be already installed in holders At the Mayall they will be kept in the loading room old plate loading room outside the control room Access to the instrument for this purpose is shown in the figures below i Figure 18 Location of access ports for slits top and filters bottom Page 39 of 45 C KOSMOS Operations Manual V1 3 7 1 Installing Multislit Masks in Holders To install masks you need a vacant mask holder and a 1 5 mm TBC Allen key or driver Use the driver to loosen and rotate the clamps holding the retaining ring in the holder and carefully remove the ring see Figure 19 below Figure 19 Mask holder with retaining ring
20. eter and screw engaging the alignment feature the alignment pin plate and one of the slotted attachment points The shutter cable is also shown installed on the controller at right See Figures 10 and 11 for KOSMOS equivalent features Page 37 of 45 C KOSMOS Operations Manual V1 3 Figure 17 View of COSMOS dewar showing additional slotted attachment points There are a total of 5 See Figure 10 for KOSMOS features it has 4 bolts that must be loosened for rotational adjustment 2 Take an image through the spectrograph with one of the long slits in position but without a disperser This produces a single image of the slit regardless of light source If a disperser is used an arc lamp is required and the lines will be curved 3 Compare the Y positions of the 2 ends of the slit unless they are within 1 pixel you will likely want to make an adjustment 4 Tighten the micrometer against the adjustment tongue and rotate a couple of turns of the micrometer 5 Repeat the measurement 2 and see how the ends of the slit have moved a If the rotation is in the desired direction continue turning the micrometer and repeating the measurement One turn of the micrometer is very roughly a couple of pixels difference end to end on the slit b If the rotation is in the wrong direction or if you over shoot back off the micrometer by the desired amount then tighten the opposing screw until the tongue is touching the micrometer
21. he instrument is oriented horizontally it should be rotated to the vertical position If the telescope adapter is attached which is unlikely it must be removed in order to rotate the instrument safely because the instrument is in or near balance only with the adapter removed It is not recommended to store the instrument in the horizontal position because the cover won t fit and therefore it is unlikely to be horizontal unless it has just undergone maintenance Removal of adapter if required Two straps should be attached to 4 eyebolts that in turn are fastened to the adapter using holes in the outer bolt circle at approximately 90 degree intervals with one strap on the upper pair and one on the lower pair A hoist is Page 16 of 45 C KOSMOS Operations Manual V1 3 used to take up the weight of the adapter using the upper strap The lower strap is not required for removal so if the adapter will not be re installed immediately it can be omitted The bolts attaching the adapter to the instrument are then removed These are accessed through the top plate surface attaching to the telescope of the adapter Once the adapter is removed it can be lowered to the ground Note alternative arrangements are acceptable provided the adapter s orientation is properly constrained Rotation of instrument if required The 2 locking spring pins on the carts that retain the instrument in the horizontal position are retracted and turned to loc
22. he normal orientation for storage and the required orientation for installation Several elements referenced in the text are labelled This view is from the side opposite the access hatches The CCD dewar shown Is a KPNO dewar used on KOSMOS the CTIO dewars SOI style for COSMOS are larger and colored black Note for extended laboratory testing the telescope adapter may have been removed and the instrument then rotated to the horizontal position See steps below if this is the case Page 15 of 45 C KOSMOS Operations Manual V1 3 Figure 3 COSMOS on handling cart note the different dewar dei This figure shows the instrument in the horizontal position with the adapter plate removed Assuming the instrument is in the vertical storage position it is prepared for installation by removing the cover and performing a visual inspection of the mounting surface and area around the dark slide see last step below The CCD dewar may be left installed on the instrument while it is stored in which case it can be left on the instrument for installation on the telescope If not it should be installed on the instrument after the instrument is installed on the telescope as described below It is recommended that the dewar be cooled down prior to installation following standard procedures for KPNO or CTIO CCD dewars see section 4 below This should be done whether the dewar is installed on the instrument beforehand or subsequently If t
23. hows the COSMOS dewar adapter installed without the dewar in order to show the interface better The basic concept is that the adapter is permanently bolted to the dewar when it is installed the central boss fits into the hole in the back of the instrument see Figure 7 The adapter plate allows for a limited amount of rotational adjustment see Figure 9 once the rotation is determined the pin shown in Figure 4 is bolted down Thereafter the dewar can be removed and re installed without losing rotational adjustment See Section 6 for details on dewar alignment Page 24 of 45 C KOSMOS Operations Manual V1 3 pm l Slotted holes attach adapter to instrument while allowing rotational adjustment Slotted plate and alignment pin define rotation position when bolted down to adapter Figure 9 COSMOS dewar interface installed on spectrograph without dewar to illustrate installation features The equivalent features for KOSMOS are shown below see also Figure 13 Reference these figures when reading the rotational alignment procedures in Section 6 Page 25 of 45 C KOSMOS Operations Manual V1 3 One of four holes for alignment pin Bolts attach dewar amp adapter to instrument Bolts with slotted hole for rotational adjustment 2 on each side of dewar Micrometer barely visible on left of dewar see next figure Figure 10 KOSMOS dewar installed on spectrograph with installation and align
24. ight or over a weekend but there is little advantage to doing so e The dewar should be filled see section 5 Because the initial fill has to cool the nitrogen tank detector mount and other hardware you should re fill after 2 6 hours to ensure it holds for the expected amount of time Do not fill the dewar while the vacuum pump is pumping it 3 3 2 Dewar Installation When the dewar is not installed on the spectrograph a cover plate is installed over the opening There is also a cap that is installed on the rear of the camera Figure 6 Do not forget to remove this cap before installing the dewar Figure 7 Page 22 of 45 C KOSMOS Operations Manual V1 3 Remove this cover BEFORE installing dowar Figure 7 View with end cap removed Page 23 of 45 C KOSMOS Operations Manual V1 3 The procedure for KOSMOS is similar however the opening for the dewar adapter is smaller The dewar adapter see Figure 8 is attached first to the dewar Alignment tongue Note controller location Cap screw Detector long axis Figure 8 COSMOS dewar adapter attached to dewar viewed from above The tongue that is used for precision alignment goes at the bottom when installed shown at the top here and the dewar is installed so that the Torrent controller is on the right side when looking at the spectrograph from behind the dewar Note the cap screw in the adapter covering the hole in front of the controller Figure 9 s
25. k them in the out position The instrument is then rotated to vertical by one person while the second person rotates and inserts the spring pins for the vertical position Note that while horizontal the instrument rests on a cross bar and will not rotate spontaneously when the locking pins are removed This is not the case when the instrument is vertical and the instrument must be manually restrained until the locking pins are inserted The instrument imbalance is small so lifting equipment is not required for this purpose The CCD dewar can be installed before rotating to the vertical position although this is not required Installation of adapter if required Prior to attaching the adapter inspect the surface of the instrument front plate and the area around the dark slide and make sure they are clean wipe them off if necessary For purposes of installation on the telescope the adapter should be installed when the instrument is vertical This requires the same arrangement of eyebolts and straps used for installation except that the adapter is lifted using both straps so it remains horizontal The adapter is then aligned with the top of the instrument and bolts are inserted through the top and partially threaded The hoist is then lowered so the adapter weight is fully borne by the instrument and the bolts are tightened Remove the straps and eyebolts The height of the instrument on the cart is such that it may be helpful to use
26. lder should look like Figure 21 The black side of the mask is facing the detector not the telescope secondary when installed in the instrument This is to minimize ghost images on the detector Page 41 of 45 C KOSMOS Operations Manual V1 3 M Figure 21 Mask installed in holder Note black side facing up 7 2 Installing Filters and Slits into KOSMOS Using the transport box take slits or filters out to the cass cage It is recommended that you write down what you are installing in which position and take the paper out to the cage with you A so make sure that anyone in the control room knows not to try to operate the mechanisms while you are doing this f you are doing an extensive series of changes you may want to stop the NOCS and even power down the IEB Access covers on the side of the instrument allow installation of slits top cover and for which there is no current need To make a change Remove the access cover e Manually rotate the wheel to the desired location Position numbers are scribed on the wheel on the left hand side of each position e f there is something installed in that position loosen the 2 cap screws that hold it in place 2 5 mm ball driver The screws are captive Loosen the screws until you can remove the holder Put the holder you ve removed into the transport box Install the new holder and tighten its retaining screw Don t over tighten Continue with any additional replacements Remember
27. link Power switch button Fan power Figure 12 Torrent controller connections The fiber cable is the orange pair connected at the top of the box the power connection is to its left and the ground connection just below that Note the ground cable is also connected to the dewar body at the vacuum gauge lower left The fan power cable connects to the fan at its top in this view The shutter connector is on the underside of the controller The shutter cable connection is underneath the controller in the view it is shown better in Figure 14 These connections are the same for both instruments Page 28 of 45 A Figure 13 View from below of KOSMOS CCD dewar after installation Note that the cage bottom when installed is only a few inches below the fill fixture The Torrent box attached to dewar on right has the ground fiber and fan power cables already connected Note the dry air hose at the fitting on the dewar adapter 3 3 4 Dewar Installation in Cage The KOSMOS dewar can be installed after the instrument has been installed on the telescope procedures for doing this for COSMOS have not been developed yet The procedure is as follows There should be a cover in place over the exit port on the spectrograph Remove it and attach it to the side of the instrument There may also be a cap over the back of the spectrograph camera this must be removed as well The dewar will normally be stored with its adapter
28. ly in one of three states off on but not connected and connected When the controller is on whether connected or not pushing the power button briefly see Figure 14 below will cause it to light up green If on but not connected the ethernet connectors to the right of the fiber connector in Figures 12 and 14 will glow orange the controller is in this state in Figure 12 A Figure 14 Location of power button Note that the Ethernet connectors are not lit up compare with Figure 12 this means that the controller is off or is on and connected In order to start up the controller the following steps are required e Make sure the software is stopped In the xterm window for the NOCS type nocs stop all nocs stop hardware For more details see the relevant section of the User Manual e Now start the controller by pushing and holding the power button for a second or two The ethernet connectors will glow orange If the shutter is connected and the instrument electronics are on the shutter will cycle Page 32 of 45 C KOSMOS Operations Manual V1 3 e Now start the NOCS see the User Manual for additional details by typing in the xterm nocs start hardware nocs start all Wait for all the windows to display Once the detector control window NMSL displays the lights on the ethernet connectors should turn off The text at the top of the NMSL window may sometime show error messages regarding incorrect voltages thes
29. me Rotation 1 The instrument is 1 Provide safety labels for telescope Hazards on mounted on the cart adapter and locking pins plungers on Cart so it can be manually cart rotated from vertical to horizontal on the cart with the telescope adapter removed However attaching the telescope adapter creates a moment that does not allow safe manual rotation 2 The rotation of the instrument even without the adapter should be restrained manually until the locking pins are engaged 2 Require 2 people to be involved when the instrument is rotated on the cart unless the rotation moment has been verified to be acceptably small normally the case when electronics dewar are installed otherwise this precaution is necessary Sharp corners In the cage it is possible to hit one s head on sharp edges or corners of the instrument 1 Primary access to the instrument for changing masks filters etc is through the side facing the cage door in the default rotator position 2 The instrument design does not include corners likely to interfere with normal servicing However the instrument access will be reviewed after installation and padding can be added if required Adapter Weight The adapter must be removed for major service and requires lifting equipment due to its weight 130 Ib Safety label for telescope adapter plus documentation of handling procedure including lift points
30. ment features indicated Figure 11 KOSMOS dewar rotation adjustment micrometer The micrometer for COSMOS is essentially the same Page 26 of 45 C KOSMOS Operations Manual V1 3 3 3 3 Electrical Connections and Related Once the dewar is installed several electrical connections must be made see Figure 10 These are Power for the controller via the laptop power supply connect to clean power Power for the controller fan connect to clean power Fiber connection to pan computer Ground connection between Torrent dewar and power strip 3rd pin Shutter control cable from side of Torrent to input on instrument electronics box IEB on the side of the instrument In addition connect the dry air hose to the barbed connector near the dewar faceplate connect the other end of the hose to the dry air outlet in the cage Make sure dry air is flowing This step is not required when the instrument is being operated in a laboratory environment Power cord to the IEB should be connected to clean power mportant run the cables across the slanted surface of the cage under a cable protector which should then be taped in place using cable tape Mayall or in the troughs in the cage bottom Blanco This reduces trip hazards Make sure there Is enough slack directly beneath the instrument to allow it to rotate through the full range of the rotator Page 27 of 45 C KOSMOS Operations Manual V1 3 Controller power Fiber
31. nd dispersers to be exchanged but they can be damaged if they are mishandled and may also damage other optics elements if dropped on them 2 All optics will be installed in their cells prior to the exchange the cells are designed with captive screws through access covers 3 Disperser exchanges are scheduled in advance and performed only during the day time Page 11 of 45 C KOSMOS Operations Manual V1 3 Hazard Hazard Description Hazard Reduction Mitigation Name Dewar The clearance between 1 Final element of camera is slightly Installation the rear of the recessed inside camera barrel Dewar Hazard spectrograph camera window is recessed inside faceplate 2 and the front of the dewar is only 4 mm There is thus potential for damaging the dewar window or the rear lens of the camera during installation The dewar assembly will be aligned to rear of instrument using alignment pin and installation jack this allows careful and repeatable installation 3 Dewar installation is scheduled in advance performed only during the day time and only by trained observatory personnel CCD Exposure to Light The LBNL CCD can be damaged by exposure to high light levels when powered on The constraints imposed by this hazard are not yet well defined but it appears probable that there is no astronomical observation that will damage the CCD Appropriate procedures will be established once th
32. otator throughout its range Rotation should be verified at the time of initial instrument installation Equipment Hazards Page 9 of 45 C KOSMOS Operations Manual V1 3 Hazard Hazard Description Hazard Reduction Mitigation Name Collision Electronics boxes on The cart base has been enlarged to Hazard on the outside of the define a footprint larger than the Cart instrument could be instrument damaged if the cart collides with walls or door frames Electrical Removal of detector Safety label and training Mountain Hazard to controller from dewar staff have extensive training already Detectors creates a static hazard regarding static hazards for CCDs to the CCD Hazard from Moving Mechanisms The mechanisms inside the instrument might move while a person is working on them The motors driving the mechanisms do not have enough power to cause injury and will stall There might be contact with optical surfaces however which is not desirable 1 Mechanisms cannot be accessed without removing access covers 2 Motor motions can be prevented by disconnecting either the power cable or the Ethernet cable to the instrument electronics preferred solution for day time servicing Alternatively a second person can be stationed at the instrument s computer console preferred solution for night time access 3 All mechanism access such as for filter or mask exchange will be
33. r and Controller I nstallation This section describes the preparation and installation of the COSMOS dewar on the spectrograph Section 4 describes basic operation of the Torrent controller Section 5 reviews basic cryogen fill procedures The alignment interface is described in Section 6 The controller operation on COSMOS is identical with operation on KOSMOS other procedures differ to some extent Page 21 of 45 C KOSMOS Operations Manual V1 3 3 3 1 Dewar Preparation Prior to installing the instrument on the telescope the dewar should be pumped down and cooled When in future there is more than one dewar available dewars should be pumped and cooled before being installed on the telescope If the dewar was recently pumped within a month or so pumping may be omitted but if time permits it s always preferable to start with an optimal vacuum The dewar can be cooled after installation on the telescope if necessary The steps are summarized below staff performing these steps are assumed to be familiar with vacuum cryogenic procedures Anyone without such training should seek further instruction first e Dewar pumping should be done with a quality turbo pump or similar device The dewar should be warm when pumped Generally the measured pressure should be in the few mTorr range or less after a few hours at this point the dewar s vacuum valve should be closed and the pump can be turned off The pump can be run longer e g overn
34. sure shutter activates and LEDs in Ethernet connectors on Torrent illuminate 2 oi Page 33 of 45 C KOSMOS Operations Manual V1 3 8 Issue NOCS commands nocs start hardware nocs start all A shortcut procedure that will solve most connection problems is to follow the sequence above but skipping steps 3 7 In this case wait 30 seconds after powering the Torrent controller off before re starting it If the shutter is not activating or the LEDs on the Ethernet connectors do not illuminate you should execute the full procedure Note if you think it may be necessary to reboot the rack computers do so after step 4 since the reboot takes more than 30 seconds several minutes you can proceed to step 5 as soon as the racks come alive and you have connected to them again Note when you install the instrument you should consider that you are at step 4 in the procedure above and continue accordingly Note there are also circumstances where the fiber link between the Torrent and the computer rack should be reset Try this before re booting the rack 4 3 Troubleshooting Noise If everything appears to be working but there is excess noise in the bias zero images there is undoubtedly a grounding issue The noise will manifest itself as a pattern on the raw images e If the noise is very high there is most likely a missing connection check that the connections have all been made see figures above for the COSMOS and K
35. te this applies to both telescopes however the access covers are facing South on the Mayall and North on the Blanco which is why the rotator angles specified above differ by 180 degrees Raise the lift until the locating pins on the bottom on the rotator guider engage the notches in the telescope adapter on top of the instrument The top of the adapter does not need to be in contact with the underside of the rotator There is some travel in the spring casters but it is important not to raise the lift too far as this could damage the handling cart or the instrument enclosure if the allowable travel is exceeded Insert and partially thread the mounting bolts IMPORTANT Retract and lock the spring pins on the cart in the retracted position Failure to do this will damage the pins and may damage the instrument and or cart when the lift is lowered Tighten the mounting bolts The mirror lift can now be lowered the cart will drop away from the instrument and can be moved out of the way The cradle interface between cart and spectrograph enclosure could be removed at this point We recommend leaving it installed however as it does not get in the way Page 18 of 45 C KOSMOS Operations Manual V1 3 sare gt To fate s A eS Figure 4 KOSMOS on handling cart on mirror lift while being installed on the rotator The view is from the direction of the cage door note the access hatches visible from this position Page 19
36. the U S community that meets many of the scientific needs described in the ReSTAR Renewing Small Telescopes for Astronomical Research Report KOSMOS was commissioned in October 2013 Figure 1 shows KOSMOS mounted in the Cassegrain Cage of the 4 m Mayall telescope Figure 1 KOSMOS mounted in the Cassegrain Cage of the 4 m Mayall telescope KOSMOS was built by a partnership between Ohio State and NOAO and is largely based on the OSMOS Ohio State Multi Object Spectrograph instrument at the MDM 2 4m Hiltner telescope The heritage from OSMOS includes an all refractive optical design that enables imaging longslit and multi slit spectroscopy over a wide field rapid Page 4 of 45 C KOSMOS Operations Manual V1 3 reconfiguration between observing modes and the capability to have a wide range of Slits filters and dispersers mounted simultaneously KOSMOS has a nearly identical twin named COSMOS Cerro Tololo Ohio State Multi Object Spectrograph at the 4 m Blanco Telescope of the Cerro Tololo Inter American Observatory Except where noted otherwise explicitly all contents of this manual apply to both instruments even if only KOSMOS is named This manual is intended to describe operational tasks required to support the instrument its target audience is therefore the NOAO scientific mountain support staff rather than the outside user Support staff should also become familiar with the User Manual as this provides a more complete
37. val document last revised March 13 2014 and the Dewar Installation and Operation Document last revised April 1 2014 3 1 C KOSMOS Installation This section describes the detailed procedures for installing and removing KOSMOS and COSMOS from the 4 m telescopes Unless explicitly stated otherwise KOSMOS refers to both instruments and the procedures are the same for both telescopes All procedures described below should be carried out by 2 people except for cabling and wiring For some procedures an additional person may be helpful but is not essential For reference keep in mind the following weights KOSMOS Weights Component Weight Ib kg KOSMOS instrument with electronics and 530 Ib 240 kg counterweight KOSMOS telescope adapter 145 Ib 66 kg KOSMOS cart 445 b 202 kg 3 1 1 Preparation for Installation KOSMOS is installed on the telescope while oriented vertically on its handling cart with the telescope adapter attached It will normally be stored in this configuration with a water resistant cover over the instrument The figure below shows the instrument with several components that are referenced in the text appropriately labelled Page 14 of 45 C KOSMOS Operations Manual V1 3 Telescope adapter Instrument cradle pivot point Locking pins Instrument cart CCD dewar Figure 2 KOSMOS on handling cart on mirror lift with dewar installed This is t
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