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FIFI LS SITR April 2009. Randolf Klein (UCB) . Quick Summary. Schedule Issues. Blue Spectrometer We are making good progress , but not as much as originally hoped. The main efforts are focussed on characterizing the red spectrometer. Schedule Issues. Documentation - PowerPoint PPT Presentation
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1SITR April 2009
FIFI LS
SITR
April 2009
Randolf Klein (UCB)
2SITR April 2009
Quick SummaryTechnical Cost Schedule Color Code
Detectors Technical Budget Schedule
Red Manufacturing
Red Testing Go At/ under On/ ahead
Blue Manufacturing Concern Concern Concern
Blue Testing Problem Above Behind
Optics
Design
Manufacturing
Gratings
Alignment/ Calibration
Filters
Structures
Cryostat
Main Structure
Electronics Boxes
Electronics
Read out
Hardware control
Sof tware
Data Collection
I nstrument Control
FAA certifi cation
I CP progress
3SITR April 2009
Schedule Issues
Blue Spectrometer
• We are making good progress, but not as much as originally hoped. The main efforts are focussed on characterizing the red spectrometer.
4SITR April 2009
Schedule Issues
Documentation• Not much real progress, yet, but
preparations to get the airworthiness efforts re-started are very promising.
• A TIM on FIFI LS Airworthiness will be held at the MPE on June 2nd, 2009.
5SITR April 2009
FIFI LS Team
F. Fumi - electronics design - 1FTE
N. Geis – FP guider + operations - 0.1 FTE
R. Hönle - detector design and testing – 0.5 FTE
R. Klein – project scientist & S/W (UCB) – 0.75 FTE
L. Looney - system & optics (UIUC) – 0.1 FTE
K. Nishikida – EOOP S/W - 1 FTE
A. Poglitsch – PI and interface for CREs – 0.1 FTE
W. Raab - cryo-mechanical systems & optics – 0.5 FTE
USRA contact: Murad Hamidouche
6SITR April 2009
ScheduleFIFI LS Development 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
FIFI LS Completion Milestones
√ Warm Electronics Test April 2003
√ Cryostat November 2004
√ Cold Electronics Test January 2005
Red Channel
√ -Detector Manufactured March 2002
√ -Optics Manufactured November 2002
√ -Grating Manufactured August 2004
√ -Spectrometer Integrated October 2005
√ -First Light January 2006
√ -End-to-End Test May 2007
√ -Performance Verif ication July 2007
Blue Channel
√ -Optics Manufactured November 2002
√ -Grating Manufactured August 2004
√ -Detector Manufactured April 2008
√ -Spectrometer Integrated December 2007
-First Light 3Q 2009
-End-to-End Test 4Q 2009
-Performance Verif ication 1Q 2010
√ Telescope Simulator March 2007
Flight Electronics Integrated 3Q 2009
MCCS Integration Test 3Q 2009
FAA
√ -Cryogen Vessels Conf. Inspection September 2004
√ -SSA Submitted June 2006
- Airworthiness TIM Jun-09
Pre-shipment Review 3Q2010
Ready for Observing 4Q 2010
EOOP
√ -Start SW Development October 2007
-MCCS Integration 4Q 2009
-Pipeline Data Reduction Tests Oct-08
-Frist EOOP Observations 2012?
7SITR April 2009
Budget
• EOOP: underspending as planning had some margin
O N D J F M A M J J A S0
50
100
150
200
250
300
350
BudgetActual
k$
FIFI LS itself is funded by the MPE.
8SITR April 2009
Progress
9SITR April 2009
Progress Summary
• Extensive Performance tests of the Red Spectrometer
• Alignment verification
• CO spectra to verify spectral resolution
• 399 out 400 red detector pixels working
• Blue detector is finished + two spare modules
10SITR April 2009
Alignment verification
The point spread function has been measured at 6 wavelengths and found to consistent with the optical design last November (from last SITR).
There was one under-illuminated column before the re-alignment.
HD [N II] [O I] [C II] CO 14-13 [N II]
11SITR April 2009
Alignment verification
• Before: Modules 5, 10, 15, 20, 25 (blue dots) got ~1/2 the light of the other modules (red squares). The data is not corrected for responsivity variations and thus the scatter.
• After re-alignment, no obvious decrease on the pixels in the “rightmost” column of the slicer. Only pixel 25 looks a bit weak, but not weaker than pixel 3. Could just be detectors.
12SITR April 2009
Alignment verification
The pixel positions are the same after the re-alignment. And the relative pixel positions do not change with wavelength.
The measurements show that the alignment is repeatable and the spatial calibration is stable.
13SITR April 2009
Spectral Resolution
• The spectral resolution of FIFI LS was measured with 6 CO lines through out the red spectrometer’s wavelength range (J=23->22 @113µm to J=14->13 @186µm) at a gas cell pressure of 1.2 mbar executed with ~1/4 pixel step size.
• Due to the low line intensity, all 399 working pixels had to be stacked. We first took the same scans at ~20 mbar to derive accurate center positions on all pixels individually.
• These center positions were used to shift the individual low-pressure profiles for the stacking.
14SITR April 2009
Spectral Resolution
A broadened CO
line at “high
pressure” of
20mbar to get an
exact wavelength
calibration for each
pixel. Lorentz Gauß
R=λ/Δλ1/2 1241 1363
15SITR April 2009
Spectral Resolution
Hardly broadened CO line at 1.2mbar all 399 pixels stacked together.
The stacking was actually done by drizzling the individual signals on a 1/8 pixel grid. The result of this procedure is shown as blue line.
The Lorentz/Gauß fits were done to the full set of individual, shifted data directly.
Lorentz GaußR=λ/Δλ1/2 1610 1560
"J=15->14", 173.631, 1.2 mbar
16SITR April 2009
Spectral Resolution
Another example for
a low pressure CO
line.
"J=23->22", 113.458, 1.2 mbar
Lorentz GaußR=λ/Δλ1/2 695 704
17SITR April 2009
Spectral Resolution
Spectral resolution vs wavelength
Prediction vs MeasurementsThe red curve shows simple model: Rectangular (rather than the elliptical geometrical beam), flat illumination of grating with borders determined by geometrical diameters of collimated beam. The resulting LSF is convolved with square pixel and FWHM calculated.
Diffraction effects give a larger illumination at longer wavelength thus a higher spectral resolutio and vice versa.
R
µm
18SITR April 2009
Blue Detector
Blue detector
is finished!
25 detector
modules
plus CREs
+ 2 spares
19SITR April 2009
FIFI LS
EOOP
Extended Observing Opportunity
ProgramAllowing the US community to use FIFI LS
as if it were a facility instrument.
20SITR April 2009
Progress
• The main focus lies on the data reduction pipeline.
• Currently, we are realizing the drizzle step and will test the pipeline on real data from the recent tests.
• Next steps:
• Interface to DCS and test data ingestion.
• Refine observing modes
• Define FIFI LS API so that SOFIA can schedule FIFI LS observation
21SITR April 2009
Data Reduction Pipeline
removenoise
fit_ramps
split_chop_cycle
demodulate
*.rff*.scn *.fit *.dff*.fits
*.chop#.FITS
*.chop#.CLEAN.FITS
*.chop#.CLEAN.rampfits.FITS
*.L2.dmod2pt.FITS
*.L2.dmod4pt1.FITS
or
FIFI-LS Data Reduction Pipeline Flow Chart
chop# = [0,1] for 2pt chop or [0,1,2,3] for 4pt chop
x2 or x4
x2 or x4
x2 or x4
“alpha”
Level 1 Processing
Level 1 Product
Level 2 Product[I.U., x 0, y0, slope0 ... slope 449]
normalize *.L2.demod.norm.FITS
(optional)
calibrate
drizzle
flux
map
*.L4.map.FITS
*.L3.flux.FITS
*.drizzle.FITS
*.cal.FITS
in-flightcalibrator
Level 2 Processing
Level 3 Processing
Level 4 Product
Level 3 Product[lambda, x, y, flux, weight]
Pipeline Flow Chart (continued)
[x,y]=f(module#, lambda)[∆RA, ∆DEC]=f(x,y)
lambda=f(I.U., pixel#, module#)
ground calibration
Recommended