test cryostat, ogse and mgse pacs ihdr: mpe 12/13 nov 2003 aiv1 pacs test cryostat, ogse and mgse...
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AIV 1
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003
PACS
Test Cryostat, OGSE and MGSE
Gerd JakobMPE
AIV 2
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003
Test Equipment and OGSE: Overview
LHe4.2 K
PACSFPU
LN2
77 K
1.7 KLHe
I / F
TESTOPTCS
CR
YO
-B
B1
CR
YO
-B
B2
PACS-Testcryostat
cryostattemp diodesMonitor 218
IEE
E/
RS
232
cryostattemp sensors
Monitor 1TIC 304 M
IEE
E
Monitor 2TIC 304 M
IEE
E
4.2 K LHe-LevelModel 135
IEE
E
1.7 K LHe-LevelModel 136
IEE
E
77 K LN2-LevelModel 186
IEE
E
PressureMonitor
PKR 251
RS
232
Motor driveelectronics
RS
232
TempSensors
Monitor 218
IEE
ER
S 232
BB1Controller 370
IEE
ER
S 232
BB2Controller 370
IEE
ER
S 232
BOLC
DEC/MEC
DPU
SPU
XY-StageControl
RS
232
m3/hm3/hvacuum-pump m3/h
Pumping unit He-pump
ext. BBand
controller
gascell
Hot
plat
e
LENS I/F
PCEA300 K Harness
CSL300 K Harness
testoptics300 K Harness
Scanner3716
Scanner3716
PC"Labview"RS 232IEEE
CR
YO
VA
CC
RY
OV
AC
RS
232
XY Stage
Testoptics4 K Harness
4-30
0 K
Har
ness
AIV 3
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003PACS test cryostat specifications
• Two liquid helium reservoirs: 70l for 4.2K and 13l for 1.7K level• 90l liquid nitrogen for thermal shielding• Optical bench diameter 1060mm, covered by 4.2K thermal shield with
900mm available height for PACS FPU + test optics• Hold time of each temperature level ~48 hours with full PACS operation
(goal)• Specified mechanical, optical and electrical interfaces to PACS FPU and
test equipment • 2 FIR windows for calibration sources input and for optical alignment
checks• 2 window shutter/filter mechanisms at 77K shield • Cryogenic filters at 77K and 4.2K shields to provide predicted Herschel
telescope background• Representative cryogenic harness with ~1100 wires + 227 shields for
FPU, ~124 wires + 20 shields for cryostat and test equipment• Specific mounting rack for different cryostat operation positions, e.g. 30°
tilt for cooler recycling; 90° tilt for shield mounting and cryostat transport.• Provide clean instrument environment, payload integration in cleanroom
class 1000
AIV 4
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003Test cryostat status
• Cryostat built at Cryovac GmbH;MPE’s design specifications fulfilled
• Cryo harness built, integrated with cryostat and tested by MPE in cw31/03
• Several cryo tests performed:-hold time 77K level ~57h-hold time pumped 1.7K level >60h, lowest temperature 1.4K-hold time 4.2K level ~56h, but only without 4.2K-shield!
• Cryostat failed last acceptance test with 4.2K-shield in cw 42/03
• Optical bench temperature too high (6,3K); 4.2K LHe-tank hold time ~24 hours (48h goal); shield temp. 25K
• Heat dissipation on 4.2K level ~1W higher than without 4.2K-shield
• Investigations on a presumable thermal link ongoing; modifications and amendments in progress
• Delivery to MPE for optical alignment of test optics with STM after successful acceptance test, end Nov.03
PACS cryostat in different positions: Overall height ~2400mm, Mounting rack ~1400mm x 2100mm
FPU integration
evacuation operation with 20°tilt
optical bench dia.1060mm cryostat transportation
AIV 5
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003Test optics and Herschel telescope simulator
specifications • Herschel telescope simulator test optics to be integrated with
test cryostat, aligned to PACS FPU and operated at 4.2K• Image quality goal: 3µm wave front error (PACS), field
distortion less than 1 blue photometer detector pixel for the total chopped PACS field of view
• Design of a complex opto-mechanical imaging and baffling system, internal and external calibration sources
• Provision of FIR background based on Herschel telescope temperature of 70K-90K
• 3 cryogenic mechanisms for different internal and external calibration source selection
• 2 internal calibrated cryogenic blackbodies• TUFIR wavelength calibrator in combination with an internal
integrating sphere• TUFIR input in combination with a point source simulator• External blackbody, extended or with point source simulator• Water vapor absorption cell for initial wavelength calibration
AIV 6
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003
Test optics schematic and design
Z
X
TC
T C
H
C
P
C
C
P
T
T
T
T
BB1
BB2
integr.sphere
M D3
chopperw heel
M 6
M 4
M D2
M 1
M 2
flipm irrorm ech.1M D1
align .cube
PACS-FPU
test optics housingand baffling system
liqu id helium
test opticsrig id supportstructure
P1
F3
P2
P3
F4
P4
P5
CW 2
CW 1
M 3
M 5
M 7M 8
1. TUFIR inputintegr. sphere
2. TUFIR inputpoin t source
3. external B B:extented orpoin t source
4. w ater vapour absorption cell w ith BB
alignm ent w ith
externalcalib rationsources:
auto co llim ator
poin t source m askand X/Y translationstage
C
CF
CF
CF
telescopefocus
CF
CTP
c o n t r o lt e m p e r a t u r e r e a d o u t
p o s i t i o n s w i t c h
M D m o t o r d r i v eM m i r r o r
P p u p i lF f o c u sB B b l a c k b o d yC F c r y o g e n i c f i l t e rC W c r y o s t a t w i n d o w
P A C S t e s t c r y o s t a t
4 . 2 K7 7 K
P A C S t e s t o p t i c sG . J a k o b 3 1 . 1 0 . 0 3
F 1
7 7 K1 . 7 K
I F
I F P C I / F
PH
G B 1
G B 2
PHH
F 5
M 9
M 1 0
T
T
T T
G B gear boxhall sensorH
T
A2A1
align .device
A a lignm ent m irror
T T
T
TT
CF
sh
utt
er2
shu
tte
r1
F 2
TC
backgroundheater
aperture4.2K
ligh t cone
3D design of test optics andHerschel telescope simulator
AIV 7
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003Test optics status
• Herschel telescope simulator test optics designed, built and assembled at MPE
• Rigid tripod structure with optics base plate and stray light reducing housing to be integrated with test cryostat
• Interfaces to cryostat, calibration sources and test equipment complete
• Test optics harness parts under final assembly
• Temperature sensors, positions sensors and read outs implemented
• Test equipment available • Integration of 10 mirrors, integrating
sphere, mechanisms and optical alignment is ongoing
• Optical alignment accuracy goal of test optics to PACS FPU within +/- 1 arcmin by means of a minimum of 3 cryogenic tests to be performed in test cryostat
AIV 8
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003
Test optics status ctd.• FIR black coating according KT72-
process applied to test optics housing and components
• 7 temperature sensors on motors, pupil P1, mirrors, structure
• Thermal I/F and cooling straps for PACS FPU manufactured and available
• The MPE developed cryo torquer motor was successfully operated at 4.2K
• Motor life time test with gear box successful at 4.2K
• Chopper wheel performance test at 4.2K to be repeated with reduced friction of angular ball bearing in order to achieve the goal for chopping frequencies up to 2Hz
• Flip mirror mechanisms to be tested at 4.2K in combination with motor/gear
• Alignment and integration is performed in cleanroom class 1000
Test optics and PACS FPU STM
Cryo flip mirror Mechanism1assembly withgear box and cryo torquer motor
AIV 9
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003Internal calibration source: cryogenic blackbody
• Design and manufacturing of 2 identical cryogenic blackbodies for absolute flux calibration and background; devices selected or chopped by test optics chopper wheel
• 18mm opening of cavity adapted to test optics pupils P4 and P5
• FIR coating acc. KT72-process applied• Operational temperature range 4.2K – 80K• Typical temperatures of 10K – 60K can be
stabilized within 35 minutes by a heaterpower of 100mW with controller LS370
• Power dissipation typically 12.5mW at 30K and 35mW at 50K
• Absolute temperature accuracy +/-20mK at 20K and +/-35mK at 50K with integrated calibrated temperature sensor CX-1070 and contr. LS370
• Thermal stability requirement of <+/-1.25mK at 30K and <+/-5mK at 50K feasible
• Status: final assembly ongoing, test equipment available, tests at cryogenic temperature to be performed during test optics alignment checks
MPE design of a cryogenic blackbody
AIV 10
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003External calibration source: TUFIR and I/F
• TUFIR (tunable high resolution coherent FIR radiation source) used for final wavelength calibration and spectral ghost detection
• I/F implemented in test optics design;input through cryostat windows 1 and 2; selected by cryo-mechanisms
• Window 1:-4.2K-aperture for 300K background reduction-f/4.4 light cone for TUFIR beam collection-integrating sphere dia. 80mm for homogenous illumination of pupil P3 and for filling the telescope simulator beam-background heater to simulate Herschel telescope temperatures of 70K-90K
• Window 2:-point source mask in combination with TUFIR located in external focus F2; PACS chopped field of view completely covered-Herschel telescope background simulated by attenuation filter sets on different temperature levels
• Status: test optics I/F available, TUFIR I/F to be defined
Test optics with integrating sphere, 4.2K-aperture and background heater for
TUFIR input through cryostat window1
AIV 11
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003External calibration source: blackbody
• External blackbody in combination with scannable point source simulator for point spread function and grating alignment investigations
• Design of X/Y translation stage and point source simulator finished
• Scanning area covers the complete field of external focus F2
• Reproducibility goal 20µm • Point source simulation pattern to
be PC controlled and synchronized with PACS data read-out
• Calibrated blackbody source and controller available, temperature range 300K – 750K, maximum cavity opening dia. 25mm
• Hot plate alternatively foreseen • Status: manufacturing has been
started
BB
300
K-7
50K
F2
CW 1
PACS test cryostat
test optics
M1
GB gear boxCW cryostat windowCF cryogenic filterMD motor drive
F focus
P pupilM mirror
control
P1
focustelescope
F1
M2
Z
X
YXtransl.stage
PS
PS point source mask
GB1
MD1 mech.1mirrorflip
M3
CF
CF
CF
C
C
C
Schematic of external blackbody set-up (above)and 3D design with pointsource mask on X/Ytranslation stage, aligned with cryostat window2
AIV 12
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003
External calibration source: water vapor source
• Design of a water vapor absorption cell for initialwavelength calibration
• 300mm absorption pathlength and typical watervapor pressure of10-25mbar provide appropriate absorptionlines in the PACSwavelength range
• Alternative gas CO foreseen• Hot plate provides background,
temperature range 300K – 600K• Alignment with external focus F2
at test cryostat window 2 • Status: final design finished end
of Nov.03
M2
flip
mech.1mirror
MD1
P1
M1
M3GB1
focustelescopeF1
CF
CF
CF
ho
t p
late
300
K-6
00K
H2O reservoir
300mm
water vapour absorption cellF2
CW 2
15mbar
pump
50-1mbar
1000-1mbar
test optics
PACS test cryostat
PC I/F
M mirror
P pupil
MD motor drive F focusCF cryogenic filterCW cryostat window
GB gear boxZ
X
IFIF
IF
schematic of the water vapor source set-up (above)and 3D design of absorption cell aligned with cryostat window 2
AIV 13
Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003
Mechanical ground support equipment MGSE
Crane with fine drives installed in MPE PACScleanroom class 1000,07/03
Hoisting device for PACS FPU available, used for STM integration06/03
Pumping unit available, containing oil free vacuum and helium pumps,pressure gauges,gas flow meters and vacuum assembly; 10/03