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PACS IBDR by ewghwehws

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									  Test Cryostat, OGSE and MGSE                PACS IHDR: MPE 12/13 Nov 2003




                                 PACS
                     Test Cryostat,
                    OGSE and MGSE

                                 Gerd Jakob
                                    MPE



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  Test Cryostat, OGSE and MGSE                                                                                            PACS IHDR: MPE 12/13 Nov 2003

                                    Test Equipment and OGSE: Overview
                                             Pumping unit                                                         He-pump




                                                                                      RS 232
                                                           vacuum-pump                                                                        CEA
                                                                               m3/h              m3/h      m3/h                                                       BOLC             DPU
                                                                                                                                              300 K Harness
                                                                                      P
                              cryostat
                 RS 232
                  IEEE/




                            temp diodes                                                                                                                         DEC/MEC                SPU
                            Monitor 218                                                                                                               CSL
                                                                                                                                                      300 K Harness

                               cryostat
                            temp sensors
                  IEEE
      CRYOVAC




                              Monitor 1                                                              PACS-
                              TIC 304 M                                                            Testcryostat
                                                                                                                                                        testoptics
                             Monitor 2
                  IEEE




                                                                                                                                                      300 K Harness
                             TIC 304 M                                         LN2
                                                                                                  LHe               1.7 K




                                                                                                                                                                                        RS 232
                                                                                                                                                                       Motor drive
                                                                                                  4.2 K             LHe                                                electronics
                                                                               77 K

                           4.2 K LHe-Level
                  IEEE




                                                             LENS I/F                             I/F                                                                   Temp
                              Model 135




                                                                                                                                                                                       RS 232
                                                                                                                                                                                        IEEE
                                                                                                 PACS                                                                  Sensors
                                                                                                                                          Scanner   Scanner           Monitor 218
       CRYOVAC




                                                                                                  FPU
                                                                                                                                           3716      3716
                           1.7 K LHe-Level
                  IEEE




                                                                                                                        4-300 K Harness
                                                             ext. BB     XY Stage
                              Model 136                                                           TEST




                                                                                                                                                                                       RS 232
                                                              and                                                                                                         BB1




                                                                                                                                                                                        IEEE
                                                                                                 OPTCS
                                                Hotplate




                                                            controller                                                                                                Controller 370
                                                                                        CRYO-




                                                                                                          CRYO-
                                                                                         BB1




                                                                                                           BB2
                           77 K LN2-Level
                  IEEE




                                                               gas
                             Model 186                         cell




                                                                                                                                                                                       RS 232
                                                                                                                                                                          BB2




                                                                                                                                                                                        IEEE
                                                                                                Testoptics                                                            Controller 370
                                                                                               4 K Harness

                              Pressure
                  RS 232




                               Monitor
                              PKR 251
                                             RS 232




                                                              XY-Stage
                                                                                                           PC
                                                               Control
                                                                                                        "Labview"
                                                                                                         RS 232
                                                                                                          IEEE
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  Test Cryostat, OGSE and MGSE                      PACS IHDR: MPE 12/13 Nov 2003

                    PACS 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
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    Test Cryostat, OGSE and MGSE                          PACS IHDR: MPE 12/13 Nov 2003

                               Test cryostat status
•   Cryostat built at Cryovac GmbH;
    MPE’s design specifications fulfilled      FPU integration   evacuation     operation with 20°tilt
•   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       optical bench dia.1060mm       cryostat transportation
    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                          PACS cryostat in different positions:
                                                    Overall height ~2400mm,
•   Delivery to MPE for optical alignment of        Mounting rack ~1400mm x 2100mm
    test optics with STM after successful
    acceptance test, end Nov.03
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  Test Cryostat, OGSE and MGSE                      PACS IHDR: MPE 12/13 Nov 2003

  Test 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


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        Test Cryostat, OGSE and MGSE                                                                                                                        PACS IHDR: MPE 12/13 Nov 2003

                                                              Test optics schematic and design
                                                                                                                           PACS test cryostat




                                                                                                               shutter1
                        BB1              test optics housing                       background
                                         and baffling system                       heater                                                 external
                    T C
                                                                                                                                          calibration
                                                     integr.sphere             T                                                          sources:
                                                                                   C          aperture
                                           M7                                                 4.2K                         CW1
      BB2      M8    P4
       T         T T          F4                                                                                                          1. TUFIR input
       C                                                                                                                                  integr. sphere
              P5   M10




                                                                                                              CF
                                                                                                              CF
                                                                                         light cone
                                                                  P3
                   F5

                                   H                      H                                   M4
                                                P2        P
                                                                                                                                 point source mask
                                                                                                                                 and X/Y translation
             M9
                                         M6                   M5                                                                 stage
                                                                       GB2
                              T
                                         G




      IF PC I/F                                           P                                                                               2. TUFIR input
                                          B




                                                                  T
                                           3




      C control              MD3                                               C                                                          point source
                                          C                       MD2                    F3
      T temperature read out                  chopper



                                                                                                               shutter2
                                                              H
      P position switch                       wheel                                                                                       3. external BB:
      H hall sensor                                                                                                                       extented or
                                                                                                                                          point source
      GB gear box
                                                     M1
      MD motor drive
      M mirror                                                                                                                            4. water vapour
      A alignment mirror                                                                                                  CW2             absorption cell
                                                                                                    H                                     with BB
      P pupil
                                                                           T                        P
      F focus
      BB blackbody         M2            A1 A2                                                                                   C
      CF cryogenic filter                                             P1                                                                  alignment with
                                                                                               M3
      CW cryostat window                                                                                                        F2        auto collimator
                                                                                   GB1
                                                                                                              CF
                                                                                                         CF
                                                                                                              CF




                                                                                     flip P
                                                                               T
                                                                                     mirror
                        PACS-FPU                                               C MD1 mech.1
                                                                  T
                                                                      align.cube

                               align.device
                                                   F1
                                                telescope X
                    test optics
                                                focus Z
                    rigid support
                    structure
                                                                                   T                    T T


                                                                           T T                      T

                                                                                                                                                             3D design of test optics and
77K                                      liquid helium                                                   77K
            4.2K                                                           T           1.7K
                                                                                                                                      PACS test optics


                                    IF
                                                                                                                                      G.Jakob 31.10.03
                                                                                                                                                             Herschel telescope simulator

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    Test Cryostat, OGSE and MGSE                  PACS IHDR: MPE 12/13 Nov 2003
                                  Test 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


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    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      Test optics and PACS FPU STM
    angular ball bearing in order to achieve
    the goal for chopping frequencies
    up to 2Hz
•   Flip mirror mechanisms to be tested at                      Cryo flip mirror
    4.2K in combination with motor/gear                         Mechanism1
•   Alignment and integration is performed                      assembly with
    in cleanroom class 1000                                     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
•   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   MPE design of a cryogenic blackbody
    performed during test optics alignment checks


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      Test Cryostat, OGSE and MGSE                       PACS IHDR: MPE 12/13 Nov 2003

                  External 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   Test optics with integrating sphere,
      levels                                              4.2K-aperture and background heater for
•     Status: test optics I/F available, TUFIR I/F to    TUFIR input through cryostat window1
      be defined
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    Test Cryostat, OGSE and MGSE                        PACS IHDR: MPE 12/13 Nov 2003

                  External calibration source: blackbody
                                                        M2                       C
                                                                                A tet r ota
                                                                                P S s cys t      a
                                                                                               tr n

•   External blackbody in combination
    with scannable point source                                       tet otic
                                                                        s p s
                                                                                              W
                                                                                              C1

    simulator for point spread function
    and grating alignment                 M1                      P
                                                                  1
                                                                                              S
                                                                                              P
    investigations                                                                            2
                                                                                              F
                                                                                  M3
•   Design of X/Y translation stage and                                    B
                                                                           G1




                                                                                       CF
                                                                                       CF
                                                                                       CF
                                                                              flip
    point source simulator finished                                             ir o
                                                                              mrr
•   Scanning area covers the complete          X
                                                                            D   eh
                                                                           M1 mc.1

    field of external focus F2             Z                               C cn o
                                                                                          S o t or
                                                                                          P pin su
                                                                              otr l           cs
                                                                                          F fou
•   Reproducibility goal 20µm                                               D or r e
                                                                           M mto div      F r oeic
                                                                                          C cygn
                                                           lecp
                                                         te soe                           W r ota
                                                                                          C cys t
•   Point source simulation pattern to                 F
                                                       1
                                                         fou
                                                           cs
                                                                           M mrr
                                                                           P pp
                                                                               ir o
                                                                              uil         B er o
                                                                                          G ga bx
    be PC controlled and synchronized
    with PACS data read-out
•   Calibrated blackbody source and
    controller available, temperature      Schematic of external
    range 300K – 750K, maximum             blackbody set-up (above)
    cavity opening dia. 25mm               and 3D design with point
•   Hot plate alternatively foreseen       source mask on X/Y
•   Status: manufacturing has been         translation stage,
                                           aligned with cryostat window2
    started


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      Test Cryostat, OGSE and MGSE                            PACS IHDR: MPE 12/13 Nov 2003

              External calibration source: water vapor source
                                                                                     00
                                                                                    101-        0
                                                                                               51-
                                                              A ecyst
                                                               S t
                                                                t    t
                                                             PC s r oa              mr
                                                                                    ba          b
                                                                                               mra
                                             1
                                             M                                         F
                                                                                       I     F
                                                                                             I
•     Design of a water vapor
      absorption cell for initial                                                 W
                                                                                  C2

      wavelength calibration                              t
                                                        t i
                                                      e oc
                                                      ts ps                                          30m
                                                                                                      0m
                                                                                                           15
                                  2
                                  M
•     300mm absorption path                          P1
                                                                                            w r a or bopne
                                                                                            a v pua s r t c
                                                                                             e
                                                                                             t          i
                                                                                                        o
      length and typical water
                                                                                      2
                                                                                      F
                                                            G 1
                                                              B   M3




                                                                         CF
      vapor pressure of




                                                                         CF
                                                                         CF
                                                                i
                                                                l
                                                                f
                                                                p
                                                                moir r
                                                                  r
      10-25mbar provide                                     M 1
                                                              D mhe .
                                                                   c1
                                                                                               2 eevi
                                                                                                O     r
                                                                                               H r sr o

      appropriate absorption                                                           up
                                                                                      pm

      lines in the PACS             X                    F C
                                                         I PF I
                                                              /               Pul
                                                                              ppi

                                           1 te c p
                                              l
                                           F e s oe                           ou
                                                                              f
                                                                              Fc s
      wavelength range
                                  Z                       D t di
                                                            m o
                                                         M or r e v
                                             fc s
                                             ou         G er o
                                                          g
                                                         B a bx                c     c
                                                                               F y gni e
                                                                                       l
                                                                                       t
                                                                              C r oe i fr
                                                          moi
                                                            r
                                                         Mr r                 Wy s w o
                                                                               c   an
                                                                              C r otti dw
•     Alternative gas CO foreseen
•     Hot plate provides background,
      temperature range 300K – 600K
•     Alignment with external focus F2 at          schematic of the
      test cryostat window 2                       water vapor source
•     Status: final design finished end of         set-up (above)
                                                   and 3D design of
      Nov.03
                                                    absorption cell aligned
                                                    with cryostat window 2


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  Test Cryostat, OGSE and MGSE                        PACS IHDR: MPE 12/13 Nov 2003

            Mechanical ground support equipment MGSE




      Hoisting device for        Crane with fine drives         Pumping unit available,
      PACS FPU available,        installed in MPE PACS          containing oil free vacuum
      used for STM integration   cleanroom class 1000,          and helium pumps,
      06/03                      07/03                          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




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