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PACS IIDR
ESTEC 01/02 March 2001
PACS Instrument
Intermediate Design Review (IIDR)
OGSE
Reinhard Katterloher
OGSE
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PACS IIDR
ESTEC 01/02 March 2001
Optical Ground Support Equipment (OGSE)
• PACS OGSE consists of different cryostats, several cryogenic
beam conditioning optics and infrared sources
(i.e. OGSE –0, -1, -2, -3, -4)
• OGSE 0 for FPU alignment/verification is under design and will
be provided by KT/MPE
• OGSE 1, 2 and 4 are required for detector module testing
(will be provided by MPE, MPIA and LENS)
• OGSE 3 and 4 are required for instrument performance
verification and on-ground wavelength calibration
(will be provided by MPE and LENS)
• Use of the various OGSEs is required from June 01 – July 05
OGSE
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PACS IIDR
ESTEC 01/02 March 2001
OGSE 1 for Detector Module Performance Testing
• OGSE 1 consists of a cryostat, optics and cryogenic BB source, it
provides IR-background and signals within later operational
range of photon flux
• OGSE 1 will be located at MPE (2x) and at MPIA (1x)
• MPE optics version „FIRSA“ was in use for EM1 – 6 tests and will
be replaced by OGSE 1 before QM, FM, FS module testing starts
• OGSE 1 is currently under final assembly (ready end March 01)
• OGSE 1 is designed for simultaneous tests on 4 resp. 7 modules
(depending on the electronics set-up used)
OGSE
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PACS IIDR
ESTEC 01/02 March 2001
OGSE 1
connector
block
cryogenic
blackbody
30-100K
shutter
test cryostat
4.2K baseplate
ø400mm
filter
filter
s-Ge:Ga detector
module 1.7K
baffle
system
connector
4.2K
f/24
flat
mirror
1.7K housing
4.2K housing
connector
block
OGSE
1.7K
heat
sink
4
PACS IIDR
ESTEC 01/02 March 2001
OGSE 1
light cone array
4.2K housing
baffle
system
filter
s-Ge:Ga detector
module 1.7K
1.7K housing
FEE 4.2K
f/24
shutter
4.2K heat sink
cryogenic
blackbody
30-100K
mirror
therm. insulator
1.7K
heat
sink
test cryostat
4.2K baseplate
ø400mm
LHe
OGSE
5
PACS IIDR
ESTEC 01/02 March 2001
OGSE 2 for Detector Module #8 spectral
and proton-irradiation Tests
• OGSE 2 consists of a LHe-dewar with optics
(providing the right IR-background) and will be
combined with
– a tunable infrared source (OGSE 4) for the spectral
investigations on the Ge:Ga pixels
– OGSE 2 will be located at LENS for this test
– a 100 MeV proton source for the high energy particle spike
(transient) investigations
– OGSE 2 will be located at PSI for this test
• OGSE 2 is under manufacture (ready July 01)
OGSE
6
PACS IIDR
ESTEC 01/02 March 2001
OGSE2
detector test
dewar ø283mm
integrating
sphere
light
cone
PACS 1x16 detector
module 1.7K
and CRE 4.2K
window
f/18 paraboloid
f/18
electrical
connector
aperture
1.7K ø3mm
1.7K
ø20
TUFIR source
20K
housing 1.7K
77K
OGSE
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PACS IIDR
ESTEC 01/02 March 2001
OGSE 2
electrical
connector
aperture
1.7K ø3mm
LHe 1.7K
integrating
sphere
light
cone
window
f/18
aperture
ø10mm
TUFIR input
CRE 4K heat sink
therm.
insulator
band pass
filter
PACS detector
module 1.7K
and CRE 4.2K
baffle
system
light cone array
f/24
2K
20K
flat mirrors
77K
detector test
dewar ø=283mm
h=700mm
OGSE
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PACS IIDR
ESTEC 01/02 March 2001
OGSE 3 for instrument characterization
Performance test and calibration activities with OGSE 3 will comprise:
• Sensitivity calibration of the photometer and spectrometer sections
of PACS
• Wavelength calibration of PACS spectrometers
• Characterization of spectral and spatial instrumental profiles for point
sources
• Use of other external sources (e.g. gas cell) in addition to TUFIR
• OGSE 3 consists of a big test cryostat, telescope simulator, optics, BB
and a window to feed-in outside cryostat IR-sources (OGSE 4 and
others)
• during functionality/performance testing (ILT1, ILT2) the optics and
the cryogenic BB is used (OGSE 3 will be located at MPE)
• during final wavelength calibration (ILT3) the optics and the tunable
IR-source TUFIR is used (OGSE 3 will be located at LENS)
• OGSE 3 is currently under design (preliminary concepts are shown),
it has to be ready for use July 02
OGSE
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PACS IIDR
ESTEC 01/02 March 2001
PACS Test Cryostat with OGSE 3
OGSE
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PACS IIDR
ESTEC 01/02 March 2001
Top view of test cryostat and optical beam of PACS FPU
and telescope simulator
OGSE
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PACS IIDR
ESTEC 01/02 March 2001
Side view of test cryostat and optical beam of PACS
FPU and telescope simulator
OGSE
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PACS IIDR
ESTEC 01/02 March 2001
OGSE 3 Schematic
PACS
+Z
FIRST focus ø240
+X
pupil
external
focus
light
cone
TUFIR input
imaging
mirror
fold
mirror
OGSE
integrating
sphere
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PACS IIDR
ESTEC 01/02 March 2001
OGSE 3 Conceptual Design
+Y
integrating
sphere
3
+Z
pupil
pupil
imaging
mirror
test cryostat
960
cryofilters
light
cone
flip mirror
pos.1
TUFIR input
integr. sphere
cryostat
windows
external
focus
TUFIR input
point source
2
point source
mask
BB focus
fold
mirror
BB
PACS
OGSE
FIRST focus ø240
14
PACS IIDR
ESTEC 01/02 March 2001
OGSE 4 TUFIR Wavelength Calibrator
• The tunable IR-source TUFIR is based on a third
order mixing of coherent radiation emitted by two
carbon dioxide lasers and microwaves generated by
a synthesizer on a metal-insulator-metal diode.
A complete coverage of the FIR spectral range is
provided. The spectral calibration requirements for
PACS are defined in PACS-ME-PL-003.
• OGSE 4 is located at LENS
• OGSE 4 is operational, adaptation of the beam to the
specific needs of PACS is necessary
(ILT3 test activities start May 03)
OGSE
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PACS IIDR
ESTEC 01/02 March 2001
OGSE 4 Schematic representation of the TUFIR
wavelength calibrator for PACS
OGSE
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PACS IIDR
ESTEC 01/02 March 2001
Cryogenic Blackbody Source (above) and example of an
Incandescent Line Source combined with a Water Vapour Absorption Cell (below)
OGSE
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