Transcript B2_TC_OGSE_MGSE

Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
PACS
Test Cryostat,
OGSE and MGSE
Gerd Jakob
MPE
AIV
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
Test Equipment and OGSE: Overview
vacuum-pump
m3/h
He-pump
RS 232
Pumping unit
m3/h
CEA
300 K Harness
m3/h
IEEE/
RS 232
cryostat
temp diodes
Monitor 218
IEEE
cryostat
temp sensors
Monitor 1
TIC 304 M
IEEE
Monitor 2
TIC 304 M
gas
cell
Scanner
3716
TEST
OPTCS
4-300 K Harness
ext. BB
and
controller
XY Stage
CRYOBB1
IEEE
Hotplate
IEEE
CRYOVAC
PACS
FPU
Scanner
3716
Temp
Sensors
Monitor 218
BB1
Controller 370
BB2
Controller 370
IEEE
RS 232
IEEE
I/F
LENS I/F
Motor drive
electronics
IEEE
RS 232
1.7 K
LHe
IEEE
RS 232
LHe
4.2 K
RS 232
LN2
Testoptics
4 K Harness
RS 232
Pressure
Monitor
PKR 251
RS 232
AIV
SPU
testoptics
300 K Harness
4.2 K LHe-Level
Model 135
77 K LN2-Level
Model 186
DPU
PACSTestcryostat
77 K
1.7 K LHe-Level
Model 136
BOLC
DEC/MEC
CSL
300 K Harness
CRYOBB2
CRYOVAC
P
XY-Stage
Control
PC
"Labview"
RS 232
IEEE
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
PACS test 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 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
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
Test cryostat status
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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
AIV
FPU integration
evacuation
optical bench dia.1060mm
operation with 20°tilt
cryostat transportation
PACS cryostat in different positions:
Overall height ~2400mm,
Mounting rack ~1400mm x 2100mm
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
Test optics and Herschel telescope simulator specifications
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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
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
Test optics schematic and design
BB1
test optics housing
and baffling system
T C
background
heater
integr.sphere
aperture
4.2K
M7
CW1
F4
light cone
P3
F5
H
P
H
P2
M5
M6
G
point source mask
and X/Y translation
stage
GB2
P
3
B
T
MD2
C
chopper
wheel
C
2. TUFIR input
point source
F3
shutter2
T
IF PC I/F
C control
MD3
T temperature read out
P position switch
H hall sensor
GB gear box
MD motor drive
M mirror
A alignment mirror
P pupil
F focus
M2
BB blackbody
CF cryogenic filter
CW cryostat window
M4
H
3. external BB:
extented or
point source
M1
T
A1 A2
C
P1
M3
F2
GB1
flip P
mirror
C MD1 mech.1
T
PACS-FPU
4. water vapour
absorption cell
with BB
CW2
H
P
alignment with
auto collimator
CF
CF
M9
CF
CF
1. TUFIR input
integr. sphere
CF
P4
M8
T T
M10
P5
external
calibration
sources:
T
C
BB2
T
C
shutter1
PACS test cryostat
T
align.cube
align.device
test optics
rigid support
structure
F1
telescope X
focus Z
T T
T
77K
liquid helium
4.2K
T T
T
T
1.7K
77K
PACS test optics
G.Jakob 31.10.03
IF
AIV
3D design of test optics and
Herschel telescope simulator
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
Test optics status
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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
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
Test optics status ctd.
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FIR black coating according KT72process 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
AIV
Test optics and PACS FPU STM
Cryo flip mirror
Mechanism1
assembly with
gear box and
cryo torquer motor
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
Internal calibration source: cryogenic blackbody
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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 heater
power 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
AIV
MPE design of a cryogenic blackbody
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
External calibration source: TUFIR and I/F
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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
AIV
Test optics with integrating sphere,
4.2K-aperture and background heater for
TUFIR input through cryostat window1
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
External calibration source: blackbody
P
A
C
S
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tsc
tryo
sa
tt
M
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C
C
W
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tso
tp
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ts
P
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P
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F
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BB 300K-750K
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
CF
CF
CF
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ran
t
sl
st
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ag
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X Y
C
P
S
p
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n
is
to
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ask
F
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fcu
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C
F
cryo
g
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cf
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t
l
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C
W
cryo
st
at
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w
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B
g
earb
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x
Schematic of external
blackbody set-up (above)
and 3D design with point
source mask on X/Y
translation stage,
aligned with cryostat window2
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
External calibration source: water vapor source
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Design of a water vapor
absorption cell for initial
wavelength calibration
300mm absorption path
length and typical water
vapor pressure of
10-25mbar provide
appropriate absorption
lines in the PACS
wavelength 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
m
bar
F
I
M
1
501
m
bar
F
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C
W
2
bar
300m
m 15m
est
t
opt
cs
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M
2
X
Z
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t l
escope
F1e
ocus
f
w
at
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vapour
absor
pt
oncel
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F2
G
B
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M
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p
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f
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m
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1m
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CF
CCFF
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P1
H
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F
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I
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F
Ppupi
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M
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B
gear
box
M
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Ff
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C
Fcr
yogeni
cf
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C
W
cr
yost
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w
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schematic of the
water vapor source
set-up (above)
and 3D design of
absorption cell aligned
with cryostat window 2
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h ot plate 30 0K -600 K
PA
C
St
est
cr
yost
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
Mechanical ground support equipment MGSE
Hoisting device for
PACS FPU available,
used for STM integration
06/03
AIV
Crane with fine drives
installed in MPE PACS
cleanroom class 1000,
07/03
Pumping unit available,
containing oil free vacuum
and helium pumps,
pressure gauges,
gas flow meters and
vacuum assembly; 10/03
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Test Cryostat, OGSE and MGSE
PACS IHDR: MPE 12/13 Nov 2003
Mechanical ground support equipment MGSE ctd.
PACS FPU class 1000
transportation container
with shock absorber,
shock and tilt indicators,
venting ports;
design complete,
manufacturing starts
11/03
AIV
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