Download Test cryostat and OGSE

PACS IBDR
MPE 27/28 Feb 2002
PACS IBDR
Test Cryostat and OGSE
Gerd Jakob
MPE
AIV
1
PACS IBDR
MPE 27/28 Feb 2002
Optical ground support equipment (OGSE)
• OGSE 1 is used for QM, FM and FS Ge:Ga detector modules
performance checks
 Status: ready for use
• OGSE 2 is used for Ge:Ga detector modules spectral and protonirradation tests to be performed at LENS and at PSI
 Status: ready for use
•
OGSE 3 is used together with a big test cryostat for PACS instrument
characterization tests to be performed on CQM+AVM, PFM and FS models
during Instrument Level Tests (ILT)
- Status:
AIV
design in progress
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PACS IBDR
MPE 27/28 Feb 2002
OGSE 3 for PACS instrument characterization
PACS cryostat specifications:
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Two liquid helium reservoirs: 70l for 4.2K and 13l for 1.7K level
90l liquid nitrogen for thermal shielding
Optical bench 1060mm diameter, covered by super-insulated 4.2K
thermal shield with 900mm available height
Service life 10 hours with full PACS operation, 48 hours with PACS off
FIR windows for calibration sources input and optical windows for
alignment checks
Cryogenic filters to provide operational telescope background
Representative cryogenic harness with 1100 wires + 227 shields + 30
overshields + ~80 wires and shields for cryostat and test equipment
Provide clean instrument environment, payload integration in cleanroom
class 1000
- Status: final specifications by MPE in progress
detailed design phase startet at manufacturer Cryovac GmbH
AIV
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PACS IBDR
MPE 27/28 Feb 2002
OGSE 3 for PACS instrument characterization ctd.
PACS cryostat dimensions:
PACS FPU integration
PACS cryostat evacuation
1060.0
PACS cryostat operation
PACS cryostat transportation
1400.0
Y
X
Y X
Y
1890.0
Y
X
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•
AIV
681.9
610.7
1332.0
2100.0
°
2320.0
X
90
900.0
537.3
20°
Tolerable overall dimensions: 1400mm diameter, ~max. 2300mm height
Specific mounting rack for different cryostat positions
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PACS IBDR
MPE 27/28 Feb 2002
OGSE 3 for PACS instrument characterization ctd.
Cryostat interfaces:
Mounting rack 1400
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FPU
suspension
1.7K I/F
1.7K
heat-sink
4.2K I/F
PACS FPU
Harness
feedthrough
4.2K I/F with
1400
test optics
1.7K I/F
Harness
feedthrough FPU
suspension
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1.7K I/F
4.2K I/F
FPU
suspension
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opt.bench 1060
AIV
Opto-mechanical I/F PACS FPU with test
optics and optical bench
3x FPU suspension feet on optical bench
4x 1.7K I/F
3x 4.2K I/F
Test optics I/F with cryostat windows
Test optics I/F with alignment devices
2x cryogenic harness feedthrough at
optical bench
Harness I/F with FPU
16x vacuum feedthrough 128 pin
connectors to warm electronics
Mechanical I/F to pumping unit
- Status:
final definition
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PACS IBDR
MPE 27/28 Feb 2002
OGSE 3 for PACS instrument characterization ctd.
Test optics specifications:
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Herschel telescope simulator test optics integrated with test cryostat, aligned
to PACS 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 fiew
Complex opto-mechanical imaging and baffling system
3 cryogenic mechanism for filter, mirror and chopper wheels
Internal or external calibration source input pre-selected by cryogenic
mechanisms
2 internal cryogenic blackbodies
TUFIR input in combination with an internal integrating sphere
TUFIR input as point source
External blackbody, extended or with point source simulator
Water vapour absorption cell
- Status:
AIV
detailed optics design
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PACS IBDR
MPE 27/28 Feb 2002
OGSE 3 for PACS instrument characterization ctd.
Test optics
schematic:
P A C S te s tc ry o s ta t
T
TC
BB1
e x te rn a l
c a ib
l ra tio n
s ouc
r e s :
in te g r.s p h e re
T
P4
BB2
T
C
C W2
M7
C
P3
P
M5
1 T
. UF R
I in p u t
in te g r.s p h e e
r
CF
CF
P5
F4
c hoppe r
wh e e
M l8
FLE
MD 3
M4
P2
M6
m iro r
wh e e l
p o in ts o u c
r e ma s k
a n d X /Y ra
t n s la io
t n
s ta g e
IF P C I/F
C
C c o n tro l
T te m p e ra u
t re e
r a dout
P p o s tio n re a d o u /s
t y nc
M D mo
M m iro r
Ppup
F fo c u
B B b la
C F c ry
C W c ry
FLEe
P
MD 2
F3
2 T
. UF R
I in p u t
pon
i ts o u rc e
to rd riv e
M2
li
s
c
o
o
n
k
g
s
tra
b
e
ta
n
od
n ic
tw in
c e
y
filte r
dow
filte r
M1
C W1
M3
C
P1
P A C S -F P U
m iro /r
filte r
wh e e l P
T
4 .w a te rv a p o u r
a b s o rp tio n c e l
w ith B B
C
F
F
C
t s to p tic s h o u s in g
e
a n d b a flin g s y s e
t m
FLE
F2
3 e
. x te n
r a lB B :
Ex e
t nde dor
p o in s
t ouc
r e
MD 1
C
C W3
a lig n .c u b e
t s to p ic
e
t s
rig id s u p p o rt
s tru c u
t re
a ig
l n m e n tw ith
a uo
t c o lim a to r
F1
t e
e
l s c ope X
fo c u s
Z
T
7 7 K
4 .2 K
liq u id h e liu m
AIV
1 .7 K
7 7 K
PACSe
t s o
t p ic
t s
G .J a k o b 0 7 .0 2 .0 2
IF
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PACS IBDR
MPE 27/28 Feb 2002
OGSE 3 for PACS instrument characterization ctd.
M2
PACS test cryostat
CW1
test optics
IF
1000-1
mbar
IF
pump
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50-1
mbar
15mbar
300mm
M1
P1
telescope
F1 focus
CF
CF
FLE
mirror/
filter
wheel
F2
water vapour absorption cell
MD1
IF PC I/F
MD motor drive
M mirror
P pupil
F focus
CF cryogenic filter
CW cryostat window
FLE entrance filter
H2O reservoir
hot plate 300K - 600K
Water vapour absorption cell:
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Initial wavelength
calibration with water
vapour (or CO gas)
absorption cell
Absorption path length
300mm, vapour
pressure 10–25mbar
Hot plate 300K – 600K
I/F with cryostat
- Status:
conceptual design
AIV
Water vapour spectrum for
PACS initial wavelength
calibration
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PACS IBDR
MPE 27/28 Feb 2002
OGSE 3 for PACS instrument characterization ctd.
External blackbody with point source simulator:
PACS test cryostat
M2
transl.stage
Y
X
C
test optics
BB 300K-750K
CW1
PS
P1
X
Z
F1
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MD motor drive
M mirror
P pupil
CF
PS point source mask
F focus
CF cryogenic filter
CW cryostat window
FLE entrance filter
Point spread function investigations and grating alignment
Translation stage with single point source or pattern masks
Blackbody source 300K – 750K
I/F with cryostat
- Status:
AIV
C
MD1
C control
telescope
focus
CF
mirror/
filter
wheel
F2
FLE
M1
conceptual design
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PACS IBDR
MPE 27/28 Feb 2002
OGSE 3 for PACS instrument characterization ctd.
Internal blackbodies:
TUFIR input (OGSE 4):
300-6000 GHz
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2 EOI Model 19726 cryogenic
blackbodies, modified to the specific
dimensions of PACS test optics
Chopping between two BB to provide
a)calibrated signal and
b)calibrated background
- Status:
AIV
conceptual design
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Final wavelength calibration at LENS
with a set of ~200 spectral lines
Combination of PACS with TUFIR, a
tunable high resolution coherent FIR
radiation source
- Status:
interface definition phase
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