fifi ls sitr december 2008
DESCRIPTION
FIFI LS SITR December 2008. Randolf Klein (UCB) . Quick Summary. QA Issues and Mitigations. Ghost Images in Red Spectrometer – Minor Ghost images have been seen in the red spectrometer tests. The ghost images are spectrally very dilute. - PowerPoint PPT PresentationTRANSCRIPT
2SITR December 2008
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 December 2008
QA Issues and Mitigations
• Ghost Images in Red Spectrometer – Minor• Ghost images have been seen in the red
spectrometer tests. The ghost images are spectrally very dilute.
• Want to remove ghost images to minimize contamination of continuum sources.
• Analysis of the ghost properties, spatial and spectral, is underway and progressing well. −Norbert analyzed a similar issue in PACS.−Need to isolate ghost path, then mitigate via
optical baffling.• Assigned to Norbert Geis, Walfried Raab, Rainer
Hoenle
4SITR December 2008
QA Issues and Mitigations
• Grating Fine Drive Software– Minor• The PID control loop for the grating fine drive
(piezo actuator) is not performing optimally.• Intermittent loss of control loop (sometimes
requiring controller reset) is degrading observing efficiency.
• Debugging of the code is underway. Compiler optimization of the code may be the cause.
• Further investigation assigned to Randolf Klein
5SITR December 2008
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.
• Limited amount of manpower is responsible for the schedule slip concerning the testing of the red spectrometer.
6SITR December 2008
Schedule Issues
Documentation• The System Safety Analysis is submitted for
comments to Dryden. We hope that this will be a positive experience allowing us to continue our airworthiness documentation.
• Leslie Looney (UIUC) is working on the SSA, again.
• Help from DSI is needed, too, but no one is available as far as we know.
• Leslie works also on the Integration and Commissioning with help by Murad Hamidouche (USRA).
7SITR December 2008
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 2Q 2009
-End-to-End Test 3Q 2009
-Performance Verif ication 4Q 2009
√ Telescope Simulator March 2007
Flight Electronics Integrated 1Q 2009
MCCS Integration Test 1Q 2009
FAA
√ -Cryogen Vessels Conf. Inspection September 2004
√ -SSA Submitted June 2006
-Instrument Conf. Inspection 3Q 2009
Pre-shipment Review 4Q 2009
Ready for Observing 1Q 2010
EOOP
-Start SW Development October 2007
-MCCS Integration 3Q 2009
-Pipeline Data Reduction Tests Oct-08
-Frist EOOP Observations 2010/11
8SITR December 2008
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
BudgetActual+Obligations
k$
FIFI LS itself is funded by the MPE.
10SITR December 2008
Progress Summary
• Extensive Performance tests of the Red Spectrometer
• Verification that misalignment is corrected
• Full Water spectrum for further wavelength calibration (all pixels)
• First line scans with grating fine drive to verify the spectral resolution
• Maps of point sources to verify the point-spread function
• Blue CRE modules bonded soon
11SITR December 2008
Online Viewer:data from a fine line scan
• Alignment problems have been solved
• 17 unconnected pixels (4%)They can easily be reconnected.
Raw Spectral Line Data
Time lapse movie of a line scan
12SITR December 2008
Wavelength Calibration
Coarse spectral scan:
• Line fit (Lorentzian)to 136.5μm water line
• Full water spectrum:108μm – 187μm
13SITR December 2008
Wavelength Calibration
Coarse spectral scan:
• Line fit (Lorentzian)to 136.5μm water line
• Full water spectrum:108μm – 187μm
• Model fit reproduces grating constant, smile/frown.
14SITR December 2008
Water Line – Fine Scan
Wavelength calibration for each individual pixel
Water line at 144.5 μm
Line fit for all pixels of the central module
Fit function: Lorentz function with offsetand linear and quadratic baseline
15SITR December 2008
Characterization of FIFI LS : Measuring the LSF
CO line at 153 µm (J: 17-16) CO line at 163 µm (J: 16-15)
A grating coarse scan => modestly sampled single pixel line scan
Predicted:R=1268
16SITR December 2008
Characterization of FIFI LS : Doing the wavelength calibration
= central wavelength + correction for pixel offset
grating equation:
assume: shrinking factor for g + const. angle offset from position read out
fit wavelength to literature wavelength values using the angles from position read out.
sigma = 0.014 µm (1/10 )
wavelength [µm]
17SITR December 2008
Focal Plane Geometry
• Continuum point source at 158μm [CII], all pixels spectrally collapsed
• You see:– Point source– Holding wire– Continuum Ghost
(w/ wire)
18SITR December 2008
Focal Plane Geometry
• Continuum point source at 158μm [CII], all pixels spectrally collapsed
• You see:– Point source
• Peak positions from “point source” fitwith spectrally collapsed “[C II]” data
19SITR December 2008
Focal Plane Geometry
“Spaxels” are not on an ideal, rectangular grid
“Spaxel” position is wavelength-independent
All spectral pixels within a “spaxel” look at same position
20SITR December 2008
Point Spread Function
• Drizzle map (1mmx1mm resolution) to combine all pixels to a PSF map.
• Point source (width 1.76mm)as predicted (1.88mm)
21SITR December 2008
PSFs across the Wavelengths
HD [N II] [O I] [C II] CO 14-13 [N II]
14.9241 10.22712.18659 1.86903
15.0232 10.23571.68634 1.53105
14.9415 10.24481.92769 1.71332
15.0419 10.23711.60656 1.48581
15.0692 10.29361.4805 1.4169
15.051 10.28681.44015 1.3904
PSFs are fully understood in terms of diffraction and pixel sampling
22SITR December 2008
FIFI LS
EOOP
Extended Observing Opportunity
ProgramAllowing the US community to use FIFI LS
as if it were a facility instrument.
23SITR December 2008
Progress
• We received the EMCCD guider camera, needed for EOOP operations. It will be integrated into FIFI LS at the MPE.
• A data reduction pipeline is built up to demodulated data.
• Currently, we are testing the pipeline on real data from the tests.
• Next steps:
• Extend the pipeline to create drizzled data cubes.
• Interface to DCS and test data ingestion.
24SITR December 2008
3D DrizzleThis is what we did 2-d: divide up the flux between 4 adjacent grid cells with weight factors defined by overlap areas
And this is the 3-d analogue: divide up the flux between 8 grid cells with weight factors defined by overlap volumes
25SITR December 2008
Data ReductionVarious single routines to reduce and analyze the data have been developed by the team. At Berkeley, we now gather these algorithms to provide a single set of tools for the team and build the data reduction pipeline from them for EOOP (all IDL).
•FIFI LS observations basic building blocks are spectral scans (with chopping[/nodding])•Simplest observation is single pointing, but to eliminate systematic errors dither maps will be used mostly•The final data product will be a calibrated data cube based on a regular grid in (ΔR.A., ΔDec.) and λ (or ΔvLSR).•Currently we are using a drizzle algorithm to combine data onto a regular grid.•A Maximum Entropy Method will be used for cube-making, ultimately.
26SITR December 2008 26/35FIFI LS Instrument Overview
“Worm Holes” Through Cube
Peak position fit
Literature value:162.812µm
LorentzGauss
(Line is pressure broadened)