03-Heyminck - GREAT SITR 100219

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					                                                                         MPIfR
                                                                         KOSMA
                            GREAT                                        MPS
                                                                         DLR-Berlin

  Lab-picture of GREAT             GREAT: German REceiver for
 equipped with theL#1 and
       L#2 channel              Astronomy at Terahertz frequencies


                                 PI-Instrument funded and
                                        developed by
                                MPIfR (2.7THz channel)
                                    R. Güsten (PI)
                                    S. Heyminck (system engineer)
                                    B. KIein (FFT spectrometer)
                                    MPIfR Engineers (electronics, LO-mechanics)
                                KOSMA (1.4/1.9THz channels)
                                    J. Stutzki (Co-PI)
                                    U.U. Graf et al. (1.4 &1.9THz LO, Optics)
                                    K. Jacobs et al. (mixers @1.9THz & 2.7THz)
                                    R. Schieder et al. (array-AOS)
                                DLR-Berlin (4.7THz channel)
                                    H-W Hübers et al. (IF, cold-Load, …)
                                MPS
                                    P. Hartogh et al. (CO-PI; CTS)


S. Heyminck, MPIfR                                            SITR February 2010; Page 1
                                                                                           MPIfR
                                                                                           KOSMA
                        Early-Science Configurations                                       MPS
                                                                                           DLR-Berlin



Channel                 Frequencies [THz]     Astronomical lines of interest
                                                               (13)                       +
low-frequency #1           1.25 – 1.50        [NII], CO(12-11), CO(13-12), HCN(17-16), H2D
low-frequency #2           1.82 – 1.92        [CII], CO(16-15)
                            2.4 – 2.7         HD, OH( 3/2), CO(22-21), CO(23-22)
                                                       2                (13)
mid-frequency
high-frequency                 4.7           [OI]

      GREAT flight configurations:
       baseline: simultaneous observations with 2 low-frequency channels
       goal: fly mid-frequency channel at the earliest possible
       upgrade: operate 4.7 THz channel (not in short and basic science)

             Short science configuration:
              baseline configuration (2 low-frequency channels)
             Basic science configuration:
              goal configurations (combinations of the mid and low-frequency channels)



S. Heyminck, MPIfR                                                              SITR February 2010; Page 2
                                                                                                                        MPIfR
                                                                                                                        KOSMA
                                   GREAT in L-L configuration                                                           MPS
                                                                                                                        DLR-Berlin


                                          Cryostats
                                                      Oscilloscope


                                          Cold-load   LO-synthesizer #1


                                                      Optics control
                                                                                                         Mixer-BIAS #1 & #2


                                                                                                         Instrument computer

                     SI mounting flange
                                                                                                         Power-supply
             SOFIA PI-rack
                                                                                                         LO-synthesizer #2

             Monitor drawler                                                                             1.9 THz Solid-state LO

                                                                                                         1.4 THz Solid-state LO
             Power distributor
             Ethernet-HUB
             Obs-computer

             IF-Power-supply


                                                                          FFTS
             IF Pre-processor
                                                                          CTS #1 and #2
             IF LO-supply
                                                                          AOS-system
             IF-processor

             Chopper control

                                                                                  Picture taken by DLR


S. Heyminck, MPIfR                                                                                        SITR February 2010; Page 3
                                                                                                                      MPIfR
                                                                                                                      KOSMA
                                            Stoplight-chart                                                           MPS
                                                                                                                      DLR-Berlin

GREAT L-L configuration passed its PSR in Dec. 2008 and is ready for shipment
   Item                    Technical Schedule Budget   Remark
   Structure                                           Finally assembled
   Cryostat                                            6 units Delivered, hold-time >24h
   Optics                                              works fine at 1.9THz
   Detectors (HEBs)                                    1.9THz ready, development ongoing
   Control-Electronics                                 final integration ongoing
   IF-Processor                                        Pre-processor ready, IF ready
   Backends                                            AOS and CTS delivered/ work fine
   BWO-LO                                              Works fine at 1.9THz
   Solid-State LO 1.4THz                               was operated at the APEX-telescope
   Solid-State LO 1.9THz                               First testsresults @ 1.9THz
   2.7THz LO-system                                    Two options                                Comments:
   Laser-LO                                            Not first flight, final assembly started    M-Band Solid-State-LO
   Software                                            In use at KOSMA 3m                            technical risk (not short
   Airworthiness                                       got positive first airworthiness report       science)
   ICP                                                 submitted (document package)

    SOFIA schedule          SOFIA schedule is still slipping fast
                                 GREAT is in sleep mode now:

                                only technology development for THz LO-sources and for mixers
                                no further testing / development activities on GREAT


S. Heyminck, MPIfR                                                                                         SITR February 2010; Page 4
                                                                                      MPIfR
                                                                                      KOSMA
                         M-Band channel developments                                  MPS
                                                                                      DLR-Berlin


        optics and cryostat are ready
               cryostat is full wired, cold-optics assembly is ready

diplexer setup                                            77K-stage
   (Martin Puplett)




    LO-injection                                                      4K-stage
      (via wire-grid)


                        optical bench


                                        cold-optics
                                    (incl. mixer-mount)

S. Heyminck, MPIfR                                                         SITR February 2010; Page 5
                                                                             MPIfR
                                                                             KOSMA
                                 Photonics LO developments                   MPS
                                                                             DLR-Berlin

 photonics LO is now the baseline LO-system
        solid-state LO is backup now
         (but still under development)
 approx. 150nW at 2.5 THz measured at first shot
  (including uncoated window and silicon lens, not
  optimized)                                                      150nW output power
 first 2.5 THz HEB pump-tests are scheduled for                     of the LO-system
  the next months
 LO was successfully tested at APEX in summer
  2009


                                  optics
                     amplifier

Fiber-
connection

                                       Design study:
                                       3D-CAD drawing of the
                                       laser-amplifier setup of
                                       the SOFIA photonics LO

S. Heyminck, MPIfR                                                SITR February 2010; Page 6
                                                                                                        MPIfR
                                                                                                        KOSMA
                                           GREAT H-Band                                                 MPS
                                                                                                        DLR-Berlin

       channel will be ready in summer 2010
                    using the original laser-lo system
                    upgrade to QCL-LO is under development at the DLR-PF
                       good chance to have it in hand after the SOFIA down-time (for LOC)


Future Plans for the H-Band channel:
       upgrade to 4 pixels
                    needs the QCL-LO
                    can most likely make use of the GREAT standard cryostat
                    no big airworthiness overheads
                    timeline: operational readiness in 2014 should be possible (maybe for FOC)
       possible upgrade to 7 pixels
                    needs redesign of the cryostat
                    new airworthiness procedure required
                    timeline: unclear


First we need to gain confidence in the SOFIA project schedule
S. Heyminck, MPIfR                                                                           SITR February 2010; Page 7
                                                                                                                                                                                  MPIfR
                                                                                                                                                                                  KOSMA
                                               6 years of schedule history                                                                                                        MPS
                                                                                                                                                                                  DLR-Berlin
                                                                          1998         1999       2000        2001         2002       2003        2004         2005       2006
                     ID                Activ ity                       Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3
                      1            GREAT Devel opment
                     2        PRELIMINARY DESIGN PHASE                                                    PDR PHASE
                     3    SI Preliminary Airworthiness Design Review                 PADR Held
                     4    DER Report Submitted to GREAT Tea m                        DER PADR Report Submitted to GREAT Te am
                     5         Revi ew and Update Sche dule
                     6                PADR Complete                                                       PADR Process Complete
                     7       CRITICAL AIRW. DESIGN PHASE                                                                                  CADR PHASE
                     8          Incremental CADR Cryostat
                     9     Review Cryostat Drawings and Analysis                                                                         (Cryostat Data Rev iew by DERs)
                     10   Incremental Cryostat Revi ew Complete                                                                          ICADR Cryostat Rev iew Complete
                     11    Rel ease Cri ti cal Ai rworthine ss Data                                                                     Release CADR Date to USRA
                     12     Review System Drawings and Analysis                                                                           System Data Rev iew by DERs
                     13        SI MANUFACTURING PHASE                                                                                           MANUFACTURING PHASE
                     14    SI QUALIFICATION TESTING PHASE                                                                                              SI TESTING PHASE
                     15           Shipment of SI to USRA...                                                                                               Shipment to USRA




                                  SOFIA Program - Level 1 Milestones

                L1-032               1st Flight (Aircraft Functional Checks)                                   04.12.2009
                L1-107               Segment 3 System Requirements Review (SRR)                                19.01.2010
                L1-101               1st Open Door Flight (Door at 100%)                                       18.12.2009
                L1-102               FORCAST Line Ops                                                          28.03.2010
                L1-103               First Light Opportunity                                                   23.04.2010
                L1-037               Short Science 1 (ISF)                                                     19.08.2010
                L1-106               Envelope Expansion 2 Start                                                01.10.2010
                L1-108
                L1-104
                                     Segment 3 Progress Review
                                     GREAT Line Ops
                                                                                                               30.11.2010
                                                                                                               08.12.2010
                                                                                                                                  This requires shipping
                L1-105               Short Science 2 Start                                                     11.01.2011
                L1-046               Basic Science Start                                                       09.02.2011         GREAT in September
                L1-110               FIFI-LS Line Ops                                                          26.04.2011
                L1-109               FIFI-LS Flights Start                                                     10.05.2011                 2010
                L1-047               TA V&V A/C Performance Flights Start                                      02.06.2011
                L1-052               Open Door Flight Test Complete                                            29.06.2011
                L1-055               Limited Operational Capability (LOC)                                      31.08.2012
                L1-056               Full Operational Capability (FOC)                                         19.06.2014


S. Heyminck, MPIfR                                                                                                                                                    SITR February 2010; Page 8
                                                                           MPIfR
                                                                           KOSMA
                          Schedule towards first (f)light                  MPS
                                                                           DLR-Berlin



           GREAT needs 24 weeks
           prior to short science #2 for:

            re-testing the first flight configuration
                     (as accepted in PSR Dec. 2008)
                       incl. testing of new HEB mixers and amplifiers
            shipment
            post-shipment test in Palmdale
            integration test aboard SOFIA (incl. EMI-test)


S. Heyminck, MPIfR                                              SITR February 2010; Page 9

				
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