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SSSC/SITR: FORCAST
September 29, 2009
Cornell University
Adams/Herter
29-Sept-09 2
FORCAST Description
• Facility Instrument• Dual-Channel 256x256 Camera
w/ Si BIB arrays 5-25 m with Si:As array 25-38 m with Si:Sb array
• 0.75 arcsec/pixel giving a 3.23.2 arcmin FOV
• Selectable Filters in 5-38 m range
FORCAST Trimester Review
Foldmirrors
Collimatormirror
SOFIAFocal plane
Cryostatwindow
FPA
Camera 1
Camera 2
25 mm
FORCAST Optical Raytrace
f/20
f/5.5
Lyot stop (pupil)
29-Sept-09 3FORCAST Trimester Review
29-Sept-09 4
FORCAST/SOFIA Early Science Goals
• Perform demonstrative science observations• Emphasize unique capabilities of SOFIA/FORCAST
Observations at 30 – 40 µm High spatial resolution in the mid-IR (2″ - 4″)
• Build collaborations between the science instrument team and external investigators
• Bridge SOFIA observations with Spitzer observations Follow-up of regions that are too bright for Spitzer Follow-up of Spitzer objects with higher spatial resolution
• Selected Early Short Science Objects Winter/Spring: Orion Summer: Galactic Center, M17
FORCAST Trimester Review
Early Science Filter Configuration
29-Sept-09 5
Position Filter Wheel
SWC LWC
FW 2 FW 1 FW 1 FW 2
1 (Home) OPEN 24.4 m (R=7.5) 38.0 m (R=8.8) OPEN2 5.3 m (R=33) 19.5 m (R=3.8) OPEN 30.6 m (R=5.7)3 6.3 m (R=48) OPEN 33.4 m (R=18) Grism 5 (R=140)4 6.6 m (R=34) 8.6 m (R=42) ND 34.8 m (R=8.3)5
7.6 m (R=15) 11.0 m (R=12)Door Occulting Mask
Door Occulting Mask
6 ND 11.28 m (R=56) 11.8 m (R=16) Grism 6 (R=250)
FORCAST Trimester Review
29-Sept-09 6
2008 2009 2010
Preship Review
Ground integration
Short science flights
J F M A M J J A S O N D J F M A M J J A S O N D
Early Science Timeline
• 10/16/08 Preship Review• 12/09 Ship to DAOF; Post-ship checkout• 1/10 Ground installation• 2/1/10 Lineops #1• 3/4/10 First Light Flight• 7/6/10 Short Science Flights
(also includes facility checkout)• 12/7/10 Start Basic Science Flights
J F M A M J A S O N DJ
Ship to DAOF
Basic science flights
First light flight
FORCAST Trimester Review
29-Sept-09 7
Detailed Timeline & Personnel LoadingDates Personnel Tasks
js MCCS Checkout
Mid-12/09 Ship
Mid-12/09 Arrival of instrument
Mid-12/09 geg,ch,jda,tlh Post-ship operations, warm test, leak check
1/10 geg, ch Cooldown
1/10 geg,ch,jda,tlh,jmdb Baseline testing & margin
1/10 geg,ch,jda,tlh,js,jmdb Install on plane
2/1/10 geg,ch,jda,tlh,js,ldk,jmdb Hangar/Line ops (9 nights; 5 contingency)
3/4/10 tlh,js First light flight
7/6/10 geg,ch,jda,tlh,js,ldk,gjs,tn,jmdb (not all fly at once)
Short science flights
FORCAST Trimester Review
Line Ops Plan
29-Sept-09 FORCAST Trimester Review 8
Test Name Description Mode
FOR-LO-1 Alignment of FORCAST to TA STARE
FOR-LO-2 SMA Focus Sequence STARE
FOR-LO-2a Occulting Masks Test STARE
FOR-LO-3 Ground Boresight Determination STARE
FOR-LO-4 TA Emissivity STARE
FOR-LO-5 Chop and Nod Settle Times; Image Quality C2N
FOR-LO-6 Optimum Chop Frequency C2N
FOR-LO-7 Plate Scale C2N
FOR-LO-8 Asymmetric Chop C2N
FOR-LO-9 Pointing Stability STARE
FOR-LO-10 Header Population for Acquired Data STARE, C2N, C2ND
FOR-LO-11 Data Reduction Pipeline Verification C2N, C2ND
FOR-LO-12 EMI/EMC Ground Testing STARE, C2N, C2ND
FOR-LO-13 Flight Scenario for Determining Frame Rates STARE
FOR-LO-14 Flight Scenario for Focus Determination STARE
FOR-LO-15 Flight Scenario for Standard Star Observations C2N, C2ND
FOR-LO-16 Flight Scenario for Science Object C2N, C2ND
FOR-LO-17 Flight Scenario for Science Object STARE (Scan)
FOR-LO-18 Flight Scenario for Science Object STARE (step)
Status ChartCategory Tech. Cost Schedule Comment
a. Cryostat No problems
b. Optics New Lakeshore Mesh Filters are installed and tested
Dichroic is still intact and performing adequately
Calibration Box is ready for end-to-end testing
c. Detector Backup 256x256 Si:Sb ready for flight
New Si:Sb larger format array in Fab (DRS Tech)
d. Electronics Both channels are operating synchronously
e. Software IMC is implemented; ready for testing CD36
f. Opto-mechanical system Pupils are aligned to simulated secondary
Arrays are co-aligned to center of field
FPA masks are installed
g. Airworthiness All documents are submitted
h. DCS
j. Documentation Some done, more to do
k. Commissioning Plan Pre-ship version to be released after cooldown 36
FORCAST Calibration Box Design
Layout in front of FORCAST
Illumination at the detector
• KRS-5 Lens images a black hot source onto the FORCAST Lyot stop• Chopper blade provides a background source
10/16/2008 10FORCAST Preship Review
Calibration Box
Lakeshore Mesh Filter Image Quality
29-Sept-09 12
2 4 6 8 10
100
200
300
Distance (pixels)
Sig
nal
Radial Plot at ( 124.22, 124.52)
• Results are consistent with diffraction-limited performance
33.4 µm
Grid of 200 µm diam. Pinholes @ field stop (77 K)
0 2 4 6 8 10
100
150
200
250
Distance (pixels)
Sig
nal
Radial Plot at ( 125.22, 127.10)
0 2 4 6 8 10
150
200
250
300
Distance (pixels)
Sig
nal
Radial Plot at ( 125.04, 127.15)
38.0 µm24.4 µm
FORCAST Trimester Review
Dichroic Performance
29-Sept-09 FORCAST Trimester Review 13
Barr 2 has better reflective performance
B Files 2568-2801R files 2411-2566
Barr3 Barr2 Mirror/open R/T_Barr3 R/T_Barr2SWC 11.0 3221 3689 4611 0.70 0.80SWC 11.3 2767 3336 4346 0.64 0.77SWC 19.5 3780 4195 4868 0.78 0.86SWC 24.4 1348 1627 1811 0.74 0.90LWC 30.6+ND2 1390 1405 3370 0.41 0.42
LWC 33.4 1865 1866 4351 0.43 0.43LWC 34.8 2499 2475 5126 0.49 0.48LWC 38.0 2064 2022 4958 0.42 0.41
Array Optimization
• Sb-083, 30.6 µm + ND2, Low Cap• Detectors are optimized for best S/N vs.:
• Detector bias • Well size• Frame time
• Determine trade-off between signal vs. dark current, hot pixels
29-Sept-09 14FORCAST Trimester Review
29-Sept-09 15
Budget Status
• FY10 budget Carry over of travel funds from previous year Delays will require an additional ~ $100k of support above current
allocation
• No future funding for larger format Si:As detector
FORCAST Trimester Review
29-Sept-09 16
Are We Ready? Yes we are!!
• FORCAST is working Mechanisms and software appear very robust
• Technical things to do yet (no show stoppers) End-to-end testing of Calibration Box Testing of IMC (shift-and-add) Implement acquisition scripts for lineops flight scenarios Implement digital detector bias control
• Schedule risks None
• Early science planning underway for range of possible flight dates, e.g. Orion or Galactic Center emphasis
GC plan requires tweaking per new (June 2010) schedule for ESS Line Ops will test different observing strategies (C2N, Scanning, etc.)
FORCAST Trimester Review
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