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