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EXESSOFIA 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 disksH2, H2O, CH4 in emission and absorption
line shapes give spatial distribution in Keplerian disks
Gas in star-formation regionsH2O, 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 Resolved
13m
SOFIA/EXES provides access to stronger lines near 18 m
Water emission resolved:90 km/s FWHMFrom r = 0.3--1 AU
Gemini/TEXES R=100,000
Carr, Knez, Richter, Knez et al.
Spitzer/IRS R=600
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EXES Summary StatusCategory Item Technical Budget Schedule Comments/Mitigation
Structures Cryostat Received and tested
Mounting Received
OptomechanicalPositioning of flip mirrors for changing modes still TBD
Optical Echelon Grating Received 2000
Echelle X-D grating Talking about custom with Bach Research
MirrorsMirror fixed by warping. Long term stability will be watched
Filters Still need custom flight filters
Detector 10242 arrayArray being tested. Must run fast for low resolution and long slit. Talking with JPL about alternate array
Electronics 10242 readout Received early April
Control and HK Work with J. Schoenwald on FPGA software
AirworthinessConformity Audit in Austin and Code QS on team
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 cell) not designed
sci produce more detailed design
postdoc
x-d grating major need two rulings for all modes. custom grating is top choice
sci go with back-to-back depending on sensitivity, cost, and risk
mjr, jl
flip mirrors major performance of mode switching mirror not tested
sci. use test images to refine during observing
jh, mm, mjr
flight filters major need order sorting filters for 5-7 um region
sci. discussions with IRML in Reading, UK
mjr
detector major is fast enough for full low-res operation?
sci. read out subarrays. look into new array with JPL
mm
MOU/transfer of PI
critical EXES still PI instrument through UCD, although hardware work at Ames
sci, sched
finalize in June mjr, pz, sh, mr, mc
Airworthiness minor Knowing where we are and getting approval
bud, sched
audit in Austin, Code QS on team
pz, mjr, ei, rg
74/16/09 7
(DRAFT)
EXES Instrument Project - Completion and Commissioning Timeline
2nd SOFIA CommissioningFlight Series(2 flights-12 hrs)
1st SOFIA CommissioningFlight Series (3 flights-18 hrs)
2nd Ground-Based Test
~ 3 mos.1st Ground-Based Test
~1 year
Project ATP
Airworthiness Approval Received
EXES in Flight Mode
Final Performance Report,
Prep. @UTA
Ship to ARC Assemble Instrumentin Lab @ARC
1st Cold EngineeringTest Complete
1st Cold ScienceTest Complete
Lab Test and Evaluation
Evidence Complete forGround-Based Test
Proposal
Baseline Project PlanFY 2009-2013
4/13
2/1312/12
5/12
8/15/11
8/15/10
3/101/1011/09
6/25/09
4/16/09
EXES Development Complete
Based on EXES IMS version 7, 4/6/09
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Overview of Progress and Status
• Project Management• EXES ATP granted for UCD/Ames team• EXES will be based at Ames with Richter as PI
• Treated as other PI instruments
• Project airworthiness audit scheduled for May 6 in Austin
• Mechanical/Cryogenic Design and Fabrication• Most parts done. Will test after shipping to
Ames
• Optics• Still need cross-dispersion grating and full filter
complement.
• Electronics & software• Electronics for 10242 array delivered to Ames
94/16/09 9
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) 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 Airworthiness 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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Last four monthsProgram Management
Detailed Schedule and budget
Received ATP
Cryogenic FabNo activities
Mechanical fabNo activities
Optical fabDiscussions with Bach Research regarding x-d grating options
Working on Dacron shield to prevent scattered light
Electronics design and fabMcKelvey and Hanratty visited Cornell to see electronics
FORCAST delivered 10242 electronics
Ames developing new thermal mount
SoftwareDiscussions with Schoenwald at Cornell regarding FPGA code
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Next 4 months plan of work
Complete MOU
Conduct EXES Audit in Austin
Prepare lab space (N211 Rm 121)
Ship EXES to Ames
Duplicate performance at Ames that was achieved in Austin
Order remaining opticscustom filters, cross-dispersion grating
Test array and electronics at all EXES backgrounds in Ames Dewar
Get new team members up to speed
System testing warm with bare readout and cold with 10242
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