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    EXES Development Status




             Matt Richter
    University of California, Davis

              28 Sep 09




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                   EXES
    SOFIA Echelon X Echelle Spectrograph
    A High Resolution Mid-Infrared Spectrograph
    Three Spectral Modes:
        R = 50-100,000 cross-dispersed
        R = 15,000 long-slit
        R = 4,000 long-slit
        plus source acquisition and pupil imaging camera
    Protoplanetary disks
        H2, H2O, CH4 in emission and absorption
        line shapes give spatial distribution in Keplerian disks
    Gas in star-formation regions
        H2O, CH4, C2H2, HCN, CH3, NH3, HNCO
        Fe, Fe+, O+3, Ne+, Ne+4, S, S+2, S+3, Ar+, Ar+2, Ar+4
    Atmospheres of Planets and Satellites


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        H2O Rotational Emission Line
                 ResolvedGemini/TEXES R=100,000
           Spitzer/IRS R=600
        13m




                                       Carr, Knez, Richter, Knez et al.



                                     Water emission resolved:
                                     90 km/s FWHM
                                     From r = 0.3--1 AU

    SOFIA/EXES provides access to stronger lines near 18
    m
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                                        EXES Summary Status
     Category               Item        Technical   Budget   Schedule                  Comments/Mitigation

    Structures    Cryostat                                              Received and tested

                  Mounting                                              Received
                                                                        Positioning of flip mirrors for changing modes still
                  Optomechanical
                                                                        TBD
    Optical       Echelon Grating                                       Received 2000

                  Echelle X-D grating                                   Ordering custom echelle from Bach Research
                                                                        Likely purchasing new diamond turned
                  Mirrors
                                                                        mirrors
                  Filters                                               Still need custom flight filters
                                                                        Low resolution readout modes not being
    Detector      10242 array
                                                                        worked on right now.
    Electronics   10242 readout                                         Received and being tested

                  Control and HK                                        Work with J. Schoenwald on FPGA software

                  Airworthiness                                         Conformity Audit in Austin went well

    Software      Instrument Control                                    Modify TEXES

                  Quicklook                                             Modify TEXES
                  Pipeline                                              Use TEXES




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                                     Issues and Mitigations

         Issue       Sev’ty           Description            Impact            Mitigation            Who

    Cal Unit         major    Cal unit (blackbody & gas     sci       produce more detailed        as
                              cell) not designed                      design over next 18 months
    x-d grating      major    using custom echelle with     sci       go with back-to-back         mjr
                              unproven sensitivity
    flip mirrors     major    performance of mode           sci.      use test images to refine    mm, mjr
                              switching mirror not tested             during observing
    flight filters   major    need order sorting filters    sci.      discussions with IRML in     mjr
                              for 5-7 um region                       Reading, UK
    detector         major    is it fast enough for full    sci.      read out subarrays. look     mm
                              low-res operation?                      into new array with JPL
    MOU/transfer     minor    EXES still PI instrument      sched     paperwork at UCD/NASA        mjr, pz
    of PI                     through UCD, although                   HQ seem slow
                              hardware work at Ames
    Airworthiness    minor    Knowing what will need to     bud,      keep tabs on other           pz, mjr,
                              be done                       sched     instruments                  df




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                      EXES Instrument Project - Completion and Commissioning Timeline

Project ATP                6/25/09

4/16/09
                                                                                                             Baseline Project Plan
                                                                                                                             FY 2009-2013


                    Ship to ARC           Assemble Instrument
                                          in Lab @ARC
    Prep. @UTA                                                  Lab Test and Evaluation
                                        11/09                   1/10         3/10
                                                                                          Evidence Complete for
                                                                                           Ground-Based Test
                                                                                                Proposal
                 1st Cold Engineering
                                                                                                   ~1 year
                 Test Complete
                                                                       (DRAFT)
                                                                           8/15/10
                                                                                                                            2nd Ground-
                                                                                                      8/15/11               Based Test

                                                        1st Cold Science                                                 Airworthiness Approval Received
                                                        Test Complete
                                                                                                           5/12            EXES in Flight Mode
                                                                                                                                                    2/13
                                                                                                                             ~ 3 mos.
                                                                                     1st Ground-        12/12
                                                                                     Based Test




                                                                                                   1st SOFIA Commissioning
                                                                                                                                       2nd SOFIA Commissioning
      Based on EXES IMS version 7, 4/6/09                                                          Flight Series (3 flights-18 hrs)
                                                                                                                                       Flight Series(2 flights-12 hrs)

                                                                                                                                      Final Performance Report,

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          4/16/09                                                                                                              7 Development Complete
                                                                                                                               EXES
                                                                                                                                                                         4/13
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      Overview of Progress and Status

    • Project Management
       • Working well in Ames N211-121
    • Mechanical/Cryogenic
       • No damage seen post shipping
       • 29 hr LHe cooldown (>26hr LN2)
    • Optics
       • Custom XD grating (Bach Research) PO
         submitted to UCD
    • Detector
       • Verified SB226 works.
           • ~0.5% bad pixels
           • Identified alternate detectors and mods
             required
    • Electronics & software
       • Concentrating on running detector.


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                             EXES Major Milestones


      Project Major Milestones                                                     04/12/13
        EXES Project Plan (Draft)                                                  02/27/09
        Cornell Boxes Receival                                                     04/10/09
        EXES Project ATP                                                           04/16/09
        Deliver EXES Instrument to Ames (From Texas)                  7 / 2 / 09   06/25/09
        Submit Proposal for First Ground-based Observatory                         03/09/10
        First Observations at Ground-based Observatory Start                       08/15/10
        Submit Proposal for second Ground-based Observatory                        03/23/11
        Second Observations at Ground-based Observatory Start                      08/15/11
        EXES Commissioning Plan Submittal                                          01/19/12
        EXES Commissioning Plan Approval                                           03/16/12
        EXES Airw orthiness Approval                                               04/05/12
        EXES Delivered to DAOF                                                     07/16/12
        EXES Line Ops starts                                                       11/15/12
        EXES Commissioning Flights Start                                           12/04/12
        EXES Development Complete                                                  04/12/13




                                                      Based on EXES IMS version 7, 4/6/09



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    4/16/09                                                              9
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                            Last four months
     Program Management
         Conducted audit in Austin (May)
     Cryogenic
         Tested post shipping.
         Developing thermal model at UCD
     Mechanical
         New slit/decker wheel bids
     Optics
         Settled on custom echelle from Bach Research
     Electronics
         Cabling installed in EXES
         Temperature sensors installed and tested
     Detector
         Verified SB 226 is working
     Software
         Schoenwald at Cornell working to modify detector control for EXES

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                      Next 4 months plan of work
     Cooldown 2
         Test bare mux in EXES
         Test hold time with wiring
         Investigate optical performance
         Review results
     Procure/Install new optical elements
         slit/decker wheel
         alignment mirrors
     Cooldown 3
         Optical alignment
         Pupil mode
     Test array in test Dewar (readout speed, sampling, clocking patterns)
     Order custom filters
     Ground-based telescope interface equipment
     Begin work on Instrument Control Software

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                                       Personnel
                                         FY10
     M. Richter (UCD)       P.I.              K. Ennico-Smith (Ames)
         Software and System Integration          System Integration
     A. Seifahrt (UCD)                        J. Reimer (Ames)
         Software, optics                         Systems Engineer
     M. McKelvey (Ames) co-I                  D. Flansburg (Ames)
         Ames lead & Array characterization       Safety and MIssion Assurance
     P. Zell (Ames)                           J. Blair (Ames)
         Project Management                       Mechanical Engineering
     J. Hanratty (Ames)                       D. Lynch (Ames)
         Electrical Engineering                   Optical Testing
     N. Scott (Ames)                          J. Lacy (UT)
         Electrical Tech                          General consulting
     Y. Nguyen (Ames)                         W. Moller (UT)
         scheduler                                Optics & electronics



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