specification-revised - National Synchrotron Radiation Research
Contents
1. Plane mirror Fig 1 The optical layout of the VLS plane grating monochromator Energy range 200eV 2600eV Work mode Fixing incoming and outgoing beams Number of plane mirror 1 side water cooled Number of grating 3 side water cooled Dispersion plane vertical Rotation range Plane 0 2 0 5 12 mirror VLS 90 a 0 5 16 grating Accuracy Plane lt 40 5 arcsec in the full range mirror VLS lt 40 5 arcsec in the full range grating Repeatability Plane lt 40 05 arcsec in the full range mirror VLS lt 40 05 arcsec in the full range grating Rotation resolution Plane lt 0 05 arcsec in the full range mirror VLS lt 0 05 arcsec in the full range grating Optical size Plane 70 mm x 400 mm x 60 mm mirror Fig 5 and Fig 6 VLS 30 mm x 220 mm x 30 mm grating three gratings have the same size Distance between incoming 20mm and outgoing beam h Entrance and exit flange size 63 mm inner diameter Incoming beam angle 2 4 Outgoing beam angle 2 4 The maximum distance 600 mm between the outside edge of the entrance flange and the center of the grating The maximum distance 250 mm between the outside edge of the exit flange and the center of the grating Vacuum lt 2 x 10 torr Table 1 Main specifications of the VLS plane grating monochromator The optical layout of the VLS plane grating m2. 1 No organic or high vapor pressure inorganic materials may be on any of the internal parts or on the vacuum side of the chamber wall after final clean 15 2 The chamber without encoders and optics shall be baked at 150 C for 7 days 15 3 Prior to shipping the contractor shall assemble pump down bake and vacuum test the entire UHV assembly This bake will be done without optics A high sensitivity quadrupole type residual gas analyzer RGA shall be used to test for unacceptable mass peaks from 1 amu to at least 80 amu The test results shall satisfy the following table The residual gas analysis bakeout and vacuum data shall then be provided to NSRRC for approval prior to shipment Suitable well baked AMU 2 5x AMU 18 Leak tight AMU 28 4x AMU 32 AMU 14 lt AMU 16 General Contaminants lt 0 1 of total pressure Chlorine Residue 0 1 of total pressure sum of AMUs 35 and 37 Hydrocarbon Residue lt 0 1 of total pressure sum of AMUs 69 and 77 15 4 The grating chamber and all of its internal parts must not produce carbon containing vacuum contaminants at partial pressures above 1x10 Torr after normal bakeout procedures in ultra high vacuum i e pressures less than 1x10 Torr with 400 liters sec pumping speed through the pumping port The total leak rate as measured by stand He leak detection 8 techniques must be less than 2x10 atm cc sec He 15 5 All flanges shall be of the conflat type unle
3. 7The monochromator chamber shall have the ability of manual adjustment in XYZ directions and roll yaw and pitch rotations The specifications of other adjustment are listed below Range Resolution X 15 mm 0 01 mm Y 15 mm 0 01 mm Z 25 mm 0 01 mm Pitch 1 5 5 arcsec Roll 1 5 5 arcsec Yaw ERS 5 arcsec 10 Monochromator installation and alignment The contractor shall be responsible for installation and alignment of the monochromator after delivery to NSRRC with the assistance of NSRRC including 1 The installation and alignment method which shall be approved by NSRRC 2 Install the monochromators to the beamline 3 Align the pitch axis of gratings to make the angle between it and x axis less than 4 arcsec x axis shall be defined and supplied by the NSRRC coordination system 4 Install the plane mirror and gratings to the chamber The plane and two gratings shall be installed into the chamber after the monochromator shipment to NSRRC 5 Align the roll of plane mirror with the error less than 0 1 arcsec 6 Align the roll of gratings to make the error less than 0 1 arcsec 7 Align the yaw of gratings to make the error less than 30 arcsec 8 Align the distance between the surface of plane mirror and its pitch axis to make the error less than 5um 9 Align the distance between the surface of each grating and its pitch axis to make the error less than 5um 10 Align the chamber to mak
4. of the plane mirror and PEBCnDES i ie rs et EDO teca it lera eue SACR apenas 5 8 Adjustments plane mirror and OT AUCs sou ioca ut ed pda rou sql eie m Mott c satu tercio afe UE 5 9 Grip MR aaa a a a aR a a a aR 6 10 Monochromator installation and alignment ss ssseseesseesseeeesseesseesseesseersserssstessressensseesssesssresseesseesseeessee 7 11 Vibrati ns of the monochromator oo ena on etie naaa aban a a a a a 7 12 Vibr tio s of the plane mitror and eratings eceso ee e r E b sb E EE E R EEES 8 15 Bake np system cehii oer EE re iod sali au sn S E E qe b usum Ie upas 8 d Bakeout stability s i IN e I Nu oM TRIN Ex OU TI RN repe e roED seis um aie eee ie tup IE Enni P ae eees 8 16 Electrical system motors amd GOBEEOIS ovo oes Ph PO Ob bine et dian ah edi see Lost i eaters 9 HL FAC TORY ACCEPTANCE LBS DC BAT d dostiescnco sa ps Godt Du fide Ede uide ogee 10 IV WATER AND ELECTRICITY a pote gie vetet t T TE case pip rod dative radici oett aa aeaa eanl aaeain 12 V DAMAGEABLE PARTS zero E HERO HAMREEHAT e IBAp ue HA Peer atn rese pas gest leg uved es baee ua Puede MA EU iege pte 12 WAS DRAWINGS T TT 12 WAL USERMANUA D 13 VIN QUALITY AND ASSURANCE 5 65 sccisuupe pina aE EE paa A EE a aa a aaa LS IX PREPARATION FOR DELIVERY ororen a a t ates e tide dishes sae EA EE 13 Appendix DE WIES romero rite Pria ed b p pieta ae A rad de aed du iaa utet nct sg ipee dus cu be 15 I INT
5. specific features 9 1 A grating observation viewport which allows viewing of the entire ruled surface of the grating in the operation position 9 2A grating adjustment 8 inch viewport which allows viewing of the yaw roll or pitch adjustment of the grating in the operation position A removable port should be large enough i e 14 inch for grating holder installation 9 3 A grating carriage observation viewport which allows viewing of the selection grating motion 9 4 An arrangement of viewport either the one large grating viewport described in item 9 2 or a set of other viewports for He Ne laser alignment using the ports from the grating at large grazing angles of incidence 9 5 Ion gauge and two spare 2 75 inch ports 9 6 The chamber shall be made of Stainless Steel AISI 316L and the standard flange material shall be Stainless Steel AISI 304L Inside the chamber stainless steel should be type 304L aluminum should be type 6061 T6 all ceramics must be vacuum fired to minimize water content all fastening screws must be silver plate To absorb the bremsstrahlung radiation the chamber wall thickness shall be no less than 3mm The observing window shall be made of lead Pb glass 7056 glass steel viewport The thickness of the observing window shall be no less than 6mm and its density shall be no less than 4 5 g cm The use of the types of materials 6 including any ultra high vacuum lubricants is subject to NSRRC approval 9
6. 6 vg LUN BHL i p_ gl PM 171 69 0 26 28 34 904 35 992 36 971 41 991 Fig 4 The layout of the TPS port 24 beamline UNITS mm aE 2 m 390 400 70 T 2 Es NOTES 1 ALL FABRICATION PROCESSES SHOULD BE UHV COMPATIBLE 2 ALL DIMENSIONS IN MILLIMETERS 3 STANDARD MANUFACTURING TOLERANCE INTEGER DIMENSIONS 0 4 ONE DECIMAL PLACE DIMENSIONS 0 1 CLEAR APERTURE 390x60 COATING 6Onm Au ond Rh 3Gmm WIDE EACH SLOPE ERROR 0 54 Rod RMS SURFACE ROUGHNESS 0 3nm RMS HO una Fig 5 The drawing of the plane mirror PM 15 a Ho H 10 UNITS mm 220 NOTE S 1 ALL FABRICATION PROCESSES SHOULD BE UHV COMPATIBLE 2 ALL DIMENSIONS IN MILLIMETERS 3 STANDARD MANUFACTURING TOLERANCE INTEGER DIMENSIONS 10 4 ONE DECIMAL PLACE DIMENSIONS 10 1 4 CLEAR APERTURE 200 x20 5 COATING amp O0nm Au or Rh 6 SLOPE ERROR TANGENTIAL 0 5 u Rod RMS SAGITTAL 54 Rod RMS Fig 6 The drawing of the grating 16 30
7. RODUCTION 1 Purpose This document contains the specifications for a variable line spacing VLS plane grating monochromator PGM SX 700 type for the TPS port 24 beamline Fig 3 at the National Synchrotron Radiation Research Center NSRRC 2 Scope of specification 1 1 The monochromator fabrication including 1 2 3 4 5 6 7 8 9 10 11 12 13 14 The monochromator chamber One plane mirror holder Three Grating holders Plane mirror scan mechanism Gratings scan mechanism Plane mirror switching mechanism Gratings switching mechanism Position and orientation adjustment mechanism of the chamber Vacuum system including 400 l s Ti sublimation ion pump turbomolecular pump 8 inch flange manual valve 8 inches CF with metric threads two pneumatic valves 4 5 inches CF with metric threads gauges with the controller and so on Bake up system Control system including two water coolers the water flow rate is 2 L min reservoir capacity 13 liters Water cooling system for plane mirror and gratings Mirror and grating installation tools A granite base shall be used to decrease the vibrations of the monochromator 1 2 Factory acceptance test 1 3 Packing and transportation 1 4 Installation at NSRRC 1 5 Final acceptance test at NSRRC 1 6 Providing once free service on NSRRC s Jobsite in the first year II SPECIFICATION AND REQUIREMENTS 1 Introduction VLS grating
8. al components and time which A0 shall be no more than 0 1 arcsec RMS and At shall be no more than 1 sec Target position 7 7 4S A0 At Fig 3 The relation between the position of optical components and time 9 Test data of the surface flatness of the cooling plates for the gratings 10 Test data of the insulation between the mirror gratings and their holders which shall show a current less than 2E 14 A measured with a picoammeter 11 Test data of the insulation between the protection plates and other parts which shall show a current less than 2E 14 A measured with a picoammeter 12 Vibration frequency spectrum test of the monochromator The frequency of the vibration spectrum of the monochromator system shall be greater than 20Hz 13 Collision protection test both software and hardware between the gratings and the plane mirror 14 Mechanical test Including 1 Range and limit switches of the mirror and grating rotation drive 2 Range and limit switches of the mirror and grating translation drive 3 Repeatability tests of the mirror and grating translation drive 4 Range and resolution tests of the in vacuum adjustments mechanism of plane mirror and gratings 5 Range and resolution tests of the chamber adjustment mechanism 15 Control test The tests include control and operation for monochromator including any or all of the controls and safety interlock specified in the technical specificati
9. an 30 arcsec The angle between switch direction and pitch axis of gratings shall be less than 3 arcsec 7 3 Repeatability of the optics at every switch position Plane mirror Height 3 um Roll 0 24 arcsec Yaw lt 10 arcsec Pitch lt 0 1 arcsec Gratings Height lt 1 um Roll 0 24 arcsec Yaw lt 10 arcsec Pitch lt 0 1 arcsec 8 Adjustments plane mirror and gratings In atmospheric pressure Coarse adjustment Range Plane mirror Height z 3 mm Pitch 2 Roll 3 Grating Height z 3 mm Pitch 2 Roll 3 Yaw 2 In vacuum fine adjustment of the grating in the operation position actuated from outside the 5 chamber when the chamber is under the vacuum The plane mirror and each grating shall be able to be aligned manually in vacuum The specifications of the alignments are listed below Range Resolution Plane mirror Height z 0 1 mm lum Pitch 0 05 0 5 arcsec Roll 0 05 0 5 arcsec Grating Height z 0 1 mm lt lum Pitch 0 05 0 5 arcsec Roll 0 05 0 5 arcsec Yaw 0 05 0 5 arcsec 9 Chamber This ultra high vacuum chamber must be fitted with ports appropriate for incoming and outgoing beams pumping pressure gauges turbomolecular pump Ti sublimation pumping This port needs a mask to avoid Ti coating on the surface of the optical components discharge cleaning etc and the following
10. cation where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements Inspection of final design In order to meet these specifications NSRRC reverses the right to inspect and require alterations of the completed designs of the grating chamber and its internal mechanisms Agreement between NSRRC and the vendor on the entire design drawings must be occurred before any actual fabrication process begins Precision and stability The vendor will install the ruled grating into the grating chamber and provide evidence must be in conjunction with a NSRRC representative that the specifications stated herein with respect to precision and stability of the various motions have been satisfied This will generally include various laser alignment and laser interferometer tests Alignment aids For alignment and testing of the grating chamber on the NSRRC floor the vendor will provide a means of generating a reference line parallel to the line which passes through the pole of each grating e g drill 2mm holes through the center of the grating carriage pivots or provide a space at the center of the grating carriage pivots for an alignment target Vacuum requirements compliance The vendor shall supply NSRRC with evidence that the completed grating chamber meets the vacuum compatibility requirements in paragraph 15 Vacuum in II SPECIFICATION AND REQUIREMENTS The nature of the test used to en
11. e Specification of the varied line spacing plane grating monochromator for the TPS port 24 beamline at NSRRC July 2014 Copyright 2014 National Synchrotron Radiation Research Center NSRRC This document is the property of National Synchrotron Radiation Research Center NSRRC No exploitation or transfer of any information contained herein is permitted in the absence of an agreement with NSRRC and neither the document nor any such information may be released without the written consent of NSRRC National Synchrotron Radiation Research Center NSRRC 101 Hsin Ann Road Hsinchu Science Park Hsinchu 30076 Taiwan Table of Contents LEE OD CT TOON re PR 1 VP UT OSC oiii E E eerie ess elon ong intact pc een or ane waaay E E E E euius 1 Ze SCOPE Ol SPECIICALION 55 vos adtosb asiento frei tay saoataactadashupsuna N I Uem S 1 II SPECIFICATION AND REQUIREMENTS 2 tihoceshaeetstuteo i cause pide cance Multi uM IM cM Uis 2 le T trod ction sosi MM EDD EUR Binder 2 2 AXIS TOtallom IMG CD DES UIs 50 ioicedauauinhsau guitare dua mu anb ded tn gud Diego data dba nutu de cups tuc dung aodio o Tube aub cies 3 3 Plane mirror and erat oldest aene ceca dius a a Sines cade kde us codem incu epu Dateien 4 Sureste ir MODEM DR 4 2 COON V SEC Mie E e E dac E uuu Md Rep edat qois tra b de qux uuo Dni aodio d DUO P A 4 6 Specifications of the pitch axis of plane mirror and gratings 5 oou eher titer sei e ten DRe e 5 7 Specifications of switch
12. e recommended to be provided to directly measure the rotation angles of the grating and the plane mirror Other equivalent device can also be accepted but shall be approved by NSRRC 3 Plane mirror and grating holders The plane mirror and gratings shall be adiabatic with the holders UHV compatible wires shall be connected to the edge of the surface of the plane mirror and gratings to measure the photon current from the surface of each optical element The wires shall not damage the optical area on the surfaces of the plane mirror and the gratings The wires shall be connected outside the chamber through flange 4 Protection plates Protection plates shall be installed at the upstream side surface of each optical element to prevent the side surface being illuminated by the SR beam The protection plates shall be electronically insulated from other parts The protection plates shall be gold coated and connected outside the chamber by UHV compatible wires to monitor the photocurrent on the protection plates The protection plates of all the gratings can be connected together The protection plate of the plane mirror shall be connected separately The protection plates shall be water cooled 5 Cooling system The plane mirror and all gratings will be side water cooled The surface of the cooling plate contacted to the grating shall have the flatness less than 25 um The tubes for water cooling systems have to be low vibration flexible hoses All co
13. e that the surface center of the grating is 1705 mm 11 Vibrations of the monochromator A granite base shall be used to decrease the vibrations of the monochromator NSRRC will supply the vibration frequency spectrum of the ground The contractor shall measure the vibration frequency spectrum of the monochromator The frequency of the vibration spectrum of the monochromator system shall be greater than 20Hz 12 Vibrations of the plane mirror and gratings The RMS vibrations of the plane mirror and gratings should be less than 0 01 arcsec measured by the rotary encoders at the manufacture s factory 13 Bake up system The power supply is 220V 60Hz Heating wires shall be installed surrounding the chamber for baking up Automatic temperature controller shall be supplied to control the baking temperature The baking up temperature increasing decreasing speed shall not exceed 15 C hr with optics The final baking process with optics at NSRRC shall be monitored by NSRRC 14 Bakeout stability The baking up temperature increasing decreasing speed shall not exceed 15 C hr with optics After a standard 120 C bakeout of this grating chamber the chamber has already met the vacuum requirement of 15 the z position of all gratings must be maintained within 2 um of their positions before baking and the yaw roll and pitch angles must be maintained within 0 5 arcsec 15 Vacuum The product must meet the following vacuum requirements 15
14. he chamber 3 The mirror and gratings holders 4 The grating chamber 5 The grating scanning system 6 3D assemble drawing including all parts 7 Drawings of the damageable parts 8 Electrical drawings Electrical drawings must be provided in AutoCAD 2D format or PDF format to the requirements of NSRRC Full maintenance information must be provided sufficient to locate faults down to individual electronic component level including but not limited to 1 System blocks diagram and general assembly drawings 2 Sub assembly drawings including component layout and electrical schematics 3 Setting up calibration or configuration instructions user manual if required 4 The detail lists for all electronic components motors encoders limit switches connectors pins 12 and thermal sensors include the types series manufactures and its contact information 5 The detail lists for all spare components VII USER MANUAL The contractor shall supply the detailed user s manual of the monochromator to NSRRC VIII QUALITY AND ASSURANCE I Responsibility for inspection Unless otherwise specified in the contract or order the supplier is responsible for the performance of all inspection requirements as specified herein Except as otherwise specified the vendor may utilize his own facilities or any commercial laboratory acceptable to NSRRC NSRRC reserves the right to perform any of the inspections and set forth in the specifi
15. ll be provided by the contractor before the delivery 1 Test showing compliance with vacuum requirements described above The leak rate and maximum vacuum without optics shall be provided 2 Residual gas analyzer test showing compliance with the requirements described above 3 The parallel integrity of the rotation axes and synchronization of the scan angles for both the plane mirror and grating optical surfaces shall be demonstrated to be better than 0 1 arcsec in both pitch and roll using autocollimation over the zero order scan range 4 Autocollimator results turning on water coolers showing the resolution and repeatability of the plane mirror and grating rotations The accuracy of the autocollimator shall be 0 05 arcsec The short term RMS vibrations measured with autocollimator shall be less than 0 1 arcsec 5 Autocollimator results turning on water coolers showing the long term more than 24 hours stability of the plane mirror and grating position The vibration in any short period ten 10 seconds during the long period shall be no more than 0 1 arcsec RMS 6 Long term stability test of the plane mirror and grating position read from encoders which shall be no more than 0 01 arcsec RMS 7 Autocollimator results showing the repeatability of the switch mechanism of the plane mirror and gratings which shall be satisfy the requirements described above 8 Figure 3 describes the relation between the position of optic
16. nce but offering suitable mechanical protection The equipment is to be suitably earthed with all sub assemblies and components bonded to a main earth terminal All cables are to be identified at both ends using cable markers applied to the cable by using a carrier strip and cable ties All visible cores of the cable are to be identified such that they can be related to their associated multi pair cable The supplier shall install one control rack box to route and connect the electrical cables from the flanges The motor and limit switches cables should be connected from the control box to the drivers We recommend the control box is also used for other signals except the encoder signals The cables and connectors between the flanges and the control box should be tight and reliable It is the responsibility of the contractor to use some protected methods from easily loosing while being touched The connectors of the motors and limit switches in the control box should use Souriau connectors and its pins to ensure the electrical wiring reliable 16 4 Electrical standards The equipment purchased or constructed for NSRRC are required to comply with the standard of safety and general product safety applied in Taiwan III FACTORY ACCEPTANCE TEST FAT The contractor shall provide a test plan for the factory acceptance test including the test methods and tools which shall be approved by NSRRC The following tests and corresponding testing procedures sha
17. oling water tube of the plane mirrors and gratings shall be surrounded by low vacuum guard tubes with the pressure of mTorr The water flow rate the pressure at the outlet and the water temperature shall be measured The values shall be sent to NSRRC monitor system The cooling circuit of each grating and the protection plates shall be in series which shall be isolated with that of the plane mirror The water flow rate is 2 4 L min and reservoir capacity is 13 liters 6 Specifications of the pitch axis of plane mirror and gratings The angle between the pitch axis of plane mirror and gratings shall be less than 4 arcsec in roll and yaw The radial vibration of the pitch axis of both the plane mirror and the gratings shall be less than 0 5um during the full rotation range 7 Specifications of switch of the plane mirror and gratings During the switch the plane mirror and the gratings will move along their respective switch axis 7 1 Switch range Plane mirror Each center of the two coating areas can be moved into the beam position Gratings The switch range of the gratings shall be determined according to the distance between each neighbor grating Each grating center can be moved into the beam position More 10mm shall be provided on each side in the switch range for both the plane mirror and gratings 7 2 Parallelism between switch direction and pitch axis The angle between switch direction and pitch axis of plane mirror shall be less th
18. on 16 Test of the sine bar length 17 Test of the cooling circuit The cooling circuit should be filled under 0 3MPa pressure for at least 1 hour without optics 11 IV VI After delivery to NSRRC all the tests listed above shall be performed again The acceptance shall be done when all the tests results satisfy the requirements and all the installation and alignments are finished according to the requirements WATER AND ELECTRICITY 1 The contractor shall provide the request on water and electricity of the monochromator 2 The power supply in NSRRC is 220V 60Hz 110V 60Hz and Taiwanese style sockets The electrical systems use 110V 60Hz and the bake up system uses 220V 60Hz 3 Two water coolers shall be used to supply cooling water for the plane mirror and gratings respectively The temperature of the cooling water shall be from 1 C to 40 C and 0 01 C temperature stability The pressure flow rate of the cooling water is 12 to 25 L min 5 speed DAMAGEABLE PARTS The contractor shall supply the list of the damageable parts and some spare parts which shall be approved by NSRRC DRAWINGS The drawings of the monochromator including the granite base shall be approved by NSRRC before the manufacture The contractor shall supply the drawings of the following parts of the monochromator to NSRRC 1 The cooling circuit connector with the plane mirror and the gratings 2 The assembly drawing of the parts inside t
19. onochromator is shown in Fig 1 There are one plane mirror and three VLS gratings in the monochromator chamber Each grating can be moved into the beam along the x axis The plane mirror contains two coating areas Each coating area of the plane mirror can also be switched into and out of the beam along x axis The main specifications of the VLS plane grating monochromator are shown in table 1 Axis rotation mechanism The axis rotation mechanism of the plane mirror and the VLS grating is shown in figure 2 The grating rotation axis is Ggc 0 mm 0 mm The plane mirror rotation axis is Mcr 0 mm 10 mm Distance between the plane mirror axis and its surface is D 20mm Distance between the right 3 edge of the mirror and the perpendicular foot of the axis is d 45 mm The tolerances are all 5um in vertical and horizon directions Mer 0 mm 10 mm Z Grating et 20mm Fig 2 Axis rotation mechanism of the plane mirror and the grating SR 0 mm 20 mm The synchronous rotation of both the plane mirror and grating shall be mechanically independent i e each mechanism has its own drive system with motors encoders and associated electronics Synchronization is achieved via the computer control system Sine bar structure shall be used in the rotation mechanism of the plane mirror and gratings The contractor shall provide the FEA analysis of the stress of the sine bar Two UHV compatible angle encoders the Renishaw RESR series ar
20. roller shall be approved by NSRRC The supplier must take responsibility for ensuring the motion controller chosen can realize the performance required The supplier shall present the outline design for the control system at tender return Detail design including choice of hardware the specifications of the hardware the control functionality description the software and hardware requirements to control the motors list of control parameters and description of the operator interfaces must be presented at the design review to be approved by NSRRC 16 2 Limit switches Each actuated drive shall include two limit switches to define the two extreme positions of each motion and one limit switch to define the home position The limit switches should be the mechanical switches Wherever possible the limit switches shall be externally mounted and manually adjustable and shall have NC normally closed contacts Information regarding the proposed switches shall be submitted to NSRRC for approval Limit switch connector brackets are to be provided by the contractor 16 3 Cabling All cable and wiring must be LSOHFR Low Smoke Zero Halogen Fire Retardant unless specifically agreed otherwise complying with IEC 60754 1 and IEC 60332 The oxygen index must be higher than 28 and acid gas emission less than 4 for the outer sheath PVC compound must not be used Where movement is required cable must be highly flexible having minimal effect on mechanical performa
21. ss approved by NSRRC All vacuum gauge heads shall be out of line of sight of any optical surfaces All vacuum gauges shall be supplied by NSRRC A suitable port with a metal sealed roughing valve shall be available for initial evacuation with a turbo pump The turbo pump will be supplied by NSRRC The contractor shall supply the turbo pump in factory test The UHV assembly shall be sealed and pumped to low vacuum prior to shipment No water to vacuum joints welds or brazed joints are permitted 16 Electrical system motors and controls The power supply is 110V 60Hz 5 phase stepping motors shall be used to drive the rotation and switch of the plane mirror and gratings The contractor shall choose the motors and drivers which will be approved by NSRRC The contractor shall provide the control system outside the chamber The control system of the plane mirror and gratings shall have the software interface for Labview programming and EPICS control To compensate the energy drift the control system shall move the energy to the set value according to the readback from the encoder every 10 seconds when the monochromator is not in moving or scanning operation This function can be turned on and off in the software interface The contractor shall provide both software and hardware protection to prevent collision between the gratings and the plane mirror The coordinated scan of the plane mirror and grating over their full scanning range shall be done in le
22. ss than 10 minutes Type K thermocouples shall be installed on the side surface of each grating and plane mirror for monitoring the bulk temperature on the optics The signals of the thermocouples shall be connected outside the chamber The temperature of the holders of plane mirror and gratings shall be monitored by type K thermocouples The temperature of the encoders shall be monitored by type K thermocouples All motor drivers cables and motion controllers required to operate the monochromator should be supplied by the manufacturer Generally the cable between the driver and motor shall be 20 m in length Proposals for full control system including software should be included in the tender The supplier are strongly encouraged to make recommendations on control system that may lead to an improvement in performance efficiency reliability safety or a reduction in cost 16 1 Monochromator control system NSRRC has applied the EPICS control system tool kit for the NSRRC accelerators beamlines and conventional facilities The monochromator control system shall be based on this standard to enable cost effective and seamless integration with the rest of the facilities on NSRRC NSRRC beamline control system is based on Galil 4080 motion controller and EPICS The contractor is required to supply the control system in EPICS All the motors should be driven by the EPICS Motor Record We recommend the supplier to use the same controller Other motion cont
23. sure compliance shall be a residual gas analysis at ultra high vacuum UHV pressures 1 x 10 Torr NSRRC must approve the details of the test method proposed by the vendor and will offer guidance as to how the test shall be performed if so requested Use of the services of an independent testing laboratory is subject to the approval of NSRRC IX PREPARATION FOR DELIVERY 13 The finished pieces must be thoroughly clean and free from any organic low vapor pressure material or cutting fluid The pieces must meet UHV requirements outlined in paragraph 15 Vacuum in II SPECIFICATION AND REQUIREMENTS Packaging The grating chamber must be packaged in such a way that foreign materials gases particulates etc can not enter the UHV portions of the chamber The suggested method of accomplishing this requirement is to ship the chamber in a sealed state filled with slight larger than 1 atm dry nitrogen The packaging method is subject to NSRRC approval Packing Packing for shipment must insure that the grating chamber is insulated from severe shock and rough handling Package markings shall indicate the fragile nature of the contents Before the delivery the vendor shall supply the factory acceptance test FAT and the FAT shall be approved by NSRRC 14 Appendix Drawings TOP VIEW M75 S P VFM Sin VLSG VRFM Sout HFM PM SIDE VIEW UNITS m 1 0 98 z 5 02 ar ls ma VRFM out s HFM 177
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