FIFI LS SITR December 2008

1SITR December 2008

FIFI LS

SITR

December 2008

Randolf Klein (UCB)

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.

9SITR December 2008

Progress

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


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


Wavelength Calibration

Coarse spectral scan:

• Line fit (Lorentzian)to 136.5μm water line

• Full water spectrum:108μm – 187μm


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.


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


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


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]


Focal Plane Geometry

• Continuum point source at 158μm [CII], all pixels spectrally collapsed

• You see:– Point source– Holding wire– Continuum Ghost

(w/ wire)



• 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



“Spaxels” are not on an ideal, rectangular grid

“Spaxel” position is wavelength-independent

All spectral pixels within a “spaxel” look at same position


Point Spread Function

• Drizzle map (1mmx1mm resolution) to combine all pixels to a PSF map.

• Point source (width 1.76mm)as predicted (1.88mm)


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


FIFI LS

EOOP

Extended Observing Opportunity

ProgramAllowing the US community to use FIFI LS

as if it were a facility instrument.


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.


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


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)


Flight Through Cube

With telescope simulator, we realized a monochromaticpoint source

The observation was carried out as fine, spatial raster+ spectral scan

FIFI LS SITR December 2008

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