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PACS Status Report Herschel ST#38 ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC

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Page 1: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

PACS Status Report

Herschel ST#38 ESAC, 30 Jun 2009

Herschelmap making workshop

10 July 2009

B.Altieri/E. Sturm for the PACS Team / HSC

Herschelmap making workshop

10 July 2009

B.Altieri/E. Sturm for the PACS Team / HSC

Page 2: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

2PACS Status Report

IAS map making workshop IAS, 10 July 2009

Overview

• Instrument Commissioning and Performance Verification Phase Calendar

• PACS Instrument Status to Date

– Mechanisms

– Detectors

– Optics/PSF/Focus

• Photometer data processing status

Page 3: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

3PACS Status Report

Herschel/PACS Commissioning

Date OD Activities

So, Mai 24, 09 11PACS switch on, SFT

Mo, Mai 25, 09 12

Di, Mai 26, 09 13

Mi, Mai 27, 09 14

Do, Mai 28, 09 15

Fr, Mai 29, 09 16Grating tuning - 1

Sa, Mai 30, 09 17

So, Mai 31, 09 18Grating tuning - 2

Mo, Jun 1, 09 19Grating tuning - 3

Di, Jun 2, 09 20Chopper stability - 1

Mi, Jun 3, 09 21Grating tuning - 4

Do, Jun 4, 09 22Chopper tuning -2

Fr, Jun 5, 09 23

Sa, Jun 6, 09 24 

So, Jun 7, 09 25 

Mo, Jun 8, 09 26FFT + dark measurement

Di, Jun 9, 09 27Chopper tuning (MTL) - 5, SPT SPEC, SPT PHOT, Bolo bias=0

Mi, Jun 10, 09 28Ge:Ga bias - 1, part 1

Do, Jun 11, 09 29Ge:Ga bias - 1, part 2

Fr, Jun 12, 09 30

IAS map making workshop IAS, 10 July 2009

Page 4: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

4PACS Status Report

Herschel/PACS Commissioning

Sa, Jun 13, 09 31 end of OD: Cooler Recycling

So, Jun 14, 09 32Cryo cover open, Sneak Preview

Mo, Jun 15, 09 33Chopper tuning (MTL) - 6, Telescope background

Di, Jun 16, 09 34

Mi, Jun 17, 09 35

Do, Jun 18, 09 36Coarse Ge:Ga Bias, CS cooldown

Fr, Jun 19, 09 37Coarse Ge:Ga Bias (dark)

Sa, Jun 20, 09 38 Bolometer Biases for Pointing - 1

So, Jun 21, 09 39

Mo, Jun 22, 09 40 

Di, Jun 23, 09 41

Mi, Jun 24, 09 42

Do, Jun 25, 09 43Bolometer Biases for Pointing - 2, Coarse GeGa Bias

Fr, Jun 26, 09 44

Sa, Jun 27, 09 45

So, Jun 28, 09 46

Mo, Jun 29, 09 47Coarse GeGa Bias (PACS CoP completed)

Di, Jun 30, 09 48SIAM Scan Search

Mi, Jul 1, 09 49

Do, Jul 2, 09 50

Fr, Jul 3, 09 51

Sa, Jul 4, 09 52

So, Jul 5, 09 53SIAM Updates & Check

Mo, Jul 6, 09 54

Di, Jul 7, 09 55

Mi, Jul 8, 09 56

Do, Jul 9, 09 57

Fr, Jul 10, 09 58 

Sa, Jul 11, 09 59 

So, Jul 12, 09 60 Mo, Jul 13, 09 61 

Di, Jul 14, 09 62 

Mi, Jul 15, 09 63End of CoP

IAS map making workshop IAS, 10 July 2009

Page 5: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

5PACS Status Report

Herschel/PACS Performance VerificationDo, Jul 16, 09 64Start of PV

Fr, Jul 17, 09 65 

Sa, Jul 18, 09 66Cooler, Phot Setup, FPG

So, Jul 19, 09 67Spec Set Up, Spec fluxMo, Jul 20, 09 68

Di, Jul 21, 09 69 Mi, Jul 22, 09 70 Do, Jul 23, 09 71 Fr, Jul 24, 09 72Cooler, Phot Setup, FPG

Sa, Jul 25, 09 73FPG, Spec Setup, Spec FPGSo, Jul 26, 09 74 Mo, Jul 27, 09 75 Di, Jul 28, 09 76 Mi, Jul 29, 09 77 Do, Jul 30, 09 78Cooler, Phot Setup, Bias (12xgreen)

Fr, Jul 31, 09 791.1.1 (8xgreen, 3xblue), PhotSpatial, SpecS Setup, FPGSa, Aug 1, 09 80 So, Aug 2, 09 81 Mo, Aug 3, 09 82 Di, Aug 4, 09 83 Mi, Aug 5, 09 84Cooler, Phot Setup, Bias (12xblue)Do, Aug 6, 09 851.1.1 (5xblue), SpecS Setup, FPG, GeGa, IP, FluxFr, Aug 7, 09 86 

Sa, Aug 8, 09 87 So, Aug 9, 09 88 

Mo, Aug 10, 09 89 Di, Aug 11, 09 90Spec Setup, Flux, FPG, WaveMi, Aug 12, 09 91GeGa, IP, Wave, AOT, Spatial, FPGDo, Aug 13, 09 92 Fr, Aug 14, 09 93 

Sa, Aug 15, 09 94 So, Aug 16, 09 95 Mo, Aug 17, 09 96Flux, GeGa, IP, AOTDi, Aug 18, 09 97Cooler, Bias, FluxMi, Aug 19, 09 98Bias, Spatial

Do, Aug 20, 09 99Cooler, Bias, Flux, Spatial, Spec IP, Spec Flux, Spec AOT

Fr, Aug 21, 09 100 Sa, Aug 22, 09 101 So, Aug 23, 09 102 Mo, Aug 24, 09 103 Di, Aug 25, 09 104Cooler, Spatial, Bias, AOT, FluxMi, Aug 26, 09 105AOT, FluxDo, Aug 27, 09 106Cooler, AOT, FluxFr, Aug 28, 09 107AOT, Flux, GeGa (1.2.3)

Sa, Aug 29, 09 108 

So, Aug 30, 09 109 

Mo, Aug 31, 09 110Flux, IP, Spatial, AOT

Di, Sep 1, 09 111Spatial, Flux, AOT

Mi, Sep 2, 09 112Cooler, AOT,Spatial, Flux

Do, Sep 3, 09 113Spatial, Flux, AOT

Fr, Sep 4, 09 114 

Sa, Sep 5, 09 115 

So, Sep 6, 09 116 

Mo, Sep 7, 09 117 

Di, Sep 8, 09 118Cooler, Spatial, AOT

Mi, Sep 9, 09 119Flux, Spatial, AOT

Do, Sep 10, 09 120 

Fr, Sep 11, 09 121 

Sa, Sep 12, 09 122 

So, Sep 13, 09 123 

Mo, Sep 14, 09 124Spatial, Flux, AOT

Di, Sep 15, 09 125AOT, Spatial, Flux

Mi, Sep 16, 09 126 

Do, Sep 17, 09 127 

Fr, Sep 18, 09 128Wave, AOT

Sa, Sep 19, 09 129AOT, Flux, Wave

So, Sep 20, 09 130Wave, Flux, AOT

Mo, Sep 21, 09 131Cooler, AOT, Flux

Di, Sep 22, 09 132 

Mi, Sep 23, 09 133 

Do, Sep 24, 09 134SPIRE/PACS parallel

Fr, Sep 25, 09 135SPIRE/PACS parallel

Sa, Sep 26, 09 136 

So, Sep 27, 09 137 

Mo, Sep 28, 09 138PACS TBD

Di, Sep 29, 09 139PACS TBD

Mi, Sep 30, 09 140 

Do, Okt 1, 09 141 

Fr, Okt 2, 09 142PACS TBD

Sa, Okt 3, 09 143PACS TBD

So, Okt 4, 09 144PACS TBD

Mo, Okt 5, 09 145PACS TBD

Di, Okt 6, 09 146 

Mi, Okt 7, 09 147 

Do, Okt 8, 09 148SPIRE/PACS parallel

Fr, Okt 9, 09 149SPIRE/PACS parallel

Sa, Okt 10, 09 150 So, Okt 11, 09 151 Mo, Okt 12, 09 152PACS TBDDi, Okt 13, 09 153PACS TBDMi, Okt 14, 09 154 End of PV

IAS map making workshop IAS, 10 July 2009

Page 6: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

6PACS Status Report

WE Operation

• Except for DPU memory hiccup during first switch-on, no major flaws encountered

• Very complex S/W system (ground segment, spacecraft, instrument) has led to failed (or non-optimum) execution of intended tests, already

• On-board data compression seems to work, to first order; optimization necessary/possible after adjustment of detector biases etc. on actual telescope background

• No need to try out redundant branch!

IAS map making workshop IAS, 10 July 2009

Page 7: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

7PACS Status Report

Chopper

• Needed for rapid modulation on/off source on sky

• Also used to look at calibration sources• Performance as on ground - final optimisation

coming

IAS map making workshop IAS, 10 July 2009

Page 8: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

8PACS Status Report

Calibration Sources

• Dynamics and temperature stability isnominal

• Temperatures may have to be adjustedto match (lower) telescope background

IAS map making workshop IAS, 10 July 2009

Page 9: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

9PACS Status Report

Filter Wheels

• Needed to select “blue” (70µm) or “green” (100µm) photometer band

• Needed to select 2nd vs. 3rd grating order in “blue” spectrometer

• Nominal performance in orbit verified

IAS map making workshop IAS, 10 July 2009

Page 10: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

10PACS Status Report

Grating Drive

• Has to actuate grating angle - over 40 deg range - to arcsec absolute accuracy, with milliarcsec/√Hz noise

• Achieved in-orbit performance better than on ground

10

IAS map making workshop IAS, 10 July 2009

Page 11: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

11PACS Status Report

300mK 3He Sorption Cooler for Bolometers

• Performance under zero-g not tested on ground

• Operation/performance in orbit better than on ground - lowest T ever reached outside of CEA lab

0.278 K

Pump temperature is now stable when the "steady-state" heater current is applied. Leaks through the thermal shunt are drastically reduced

IAS map making workshop IAS, 10 July 2009

Page 12: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

12PACS Status Report

300mK 3He Sorption Cooler Operation

Cold side runs 1K colder than before.Better insulation in the thermal shunt.Evaporator driven below 2K by the cooling strap.More efficient cooling through the strap (temperature peak occurs before the end of pump strong heating)

Estimated operating time ~60h

t_hold = 72.7 - 0.19 * t_oper

IAS map making workshop IAS, 10 July 2009

Page 13: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

13PACS Status Report

Bolometer Operation

Bolometer array noise maps:black = no noise (blind), white = high noise (hot)

• Qualitatively no difference to before launch

• Glich rate 1/150 s-1 per pixel, glitch duration ~2 frames of 0.1s

IAS map making workshop IAS, 10 July 2009

Page 14: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

14PACS Status Report

Photometer “Sneak Preview”

• Requested by ESA directorate - “no” was not an option• PS and PACS had serious doubts about feasibility, with no knowledge of

background, untested bolometer settings, ...• Attempt was made, anyway, on 14 June, after lid opening• First data arrived on the evening of 15 June

Map making movie

IAS map making workshop IAS, 10 July 2009

Page 15: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

15PACS Status Report

Photometer “Sneak Preview”

Herschel/PACS Images of M51 (“Whirlpool Galaxy”)

70 µm100 µm

160 µm

© ESA & The PACS Consortium

MADmap

PEP MeetingIAS map making workshop IAS, 10 July 2009

Page 16: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

16Spitzer/MIPS 160µm

Herschel/PACS 160µmHerschel/PACS70/100/160 µm

Page 17: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

17PACS Status Report

First Point Source (Star) Chop/Nod Observation

• Blue PSFs have a narrow core (width ~as expected for ideal telescope)

• Stronger wing than for ideal telescope, triangular shape

• Overall (core+wing) gaussian FHWM in frame is observed to be ~5-6” vs. 4.5” in a model based on PICC-ME-TN029 PSFs

• Strehl estimated ~0.6• Same triangular pattern seen

on 4 different stars, in point source reduction vs. single frames from scan… NOT a source property.

Left: Observation Right: Model

IAS map making workshop IAS, 10 July 2009

Page 18: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

18PACS Status Report

First Point Source (Star) Chop/Nod Observation

• Central peak width is nominal• “Triangular” wings qualitatively understood in

terms of dominating WFE symmetry / calculated spot diagrams

IAS map making workshop IAS, 10 July 2009

Page 19: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

21PACS Status Report

Predicted PSF from WFE

• Effect explained (qualitatively) - telescope, not PACS• Thermo-elastic stress on M1• Strehl ratio / main beam efficiency under evaluation

IAS map making workshop IAS, 10 July 2009

Page 20: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

22PACS Status Report

Pointing Information(4 Stars)

• Using 0032_0003.SIAM

• 4 point sources, several scan maps

• Point sources and CAP 3.1.1:– dy=4.59 stdev 1.35arcsec– dz=5.50 stdev 1.19arcsec– Note that these errors are based on

two independent pointings (nod) each

• Consistent up to OD53 where new offset of ~14 arcsec, observed both in target footprint position and scan map astrometry

– ACMS update ?– Thermo-elastic effect on STR,

SAA dependent.

IAS map making workshop IAS, 10 July 2009

Page 21: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

23PACS Status Report

Deglitching

• Multi-median resolution transform (MMT), Starck et al. 1998.

IAS map making workshop IAS, 10 July 2009

Page 22: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

24PACS Status Report

Flux-calibration

• Will start :– once the final detector biases are implemented (adjusted

to the final telescope temperature) – and the high gain is used.

IAS map making workshop IAS, 10 July 2009

Page 23: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making
Page 24: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making
Page 25: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making
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28PACS Status Report

1/f noise removal: simple high pass filter

IAS map making workshop IAS, 10 July 2009

Page 27: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

29PACS Status Report

Telescope Background

• Spectral scan on cryostat cover and telescope, single pixel. No chopping, no response drift correction; simple glitch removal

• Telescope background on the lower side of nominal• Background measurement with bolometers not quite consistent

cryo-cover @ 86 K

cryo-cover @ 72 K, in orbit

nominal telescope background@ 108K, 95K, 85 K

telescope background, OD 33

telescope background, OD 38

IAS map making workshop IAS, 10 July 2009

Page 28: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

30PACS Status Report

Instrument Anomalies

• Drop-outs in temperature sensor data• “NaN” symptom - no explanation, yet; running

tests• Could potentially affect T-control of calibration

sources?

No!

IAS map making workshop IAS, 10 July 2009

Page 29: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

31PACS Status Report

Instrument/Spacecraft Issues

• DECMEC performance (chopper control) degraded below 0° C - requested change in temperature limits / heater operation

• Timing offsets between science data and position information - under investigation; PACS contribution understood, ACMS part apparently, too

• Interference on bolometer signals?Seen sporadically with amplifier low-gain operation, not with high-gain - but little statistics, yet– without the harness re-routing, ...Single-scan PhotProjmap reconstruction

IAS map making workshop IAS, 10 July 2009

Page 30: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

32PACS Status Report

Ground Segment Issues

• Data seem to arrive at ESOC all complete, but propagation to ICC sometimes incomplete– Delays analysis, which is often time-critical for feed-

back into following OD programmes

IAS map making workshop IAS, 10 July 2009

Page 31: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

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• Let’s keep fingers crossed...PACS Status Report

Instrument Status

• We are about 90% through commissioning

• All elements of PACS have been successfully operated

• Optimisation of mechanism control completed

• First assessment of detector behaviour achieved

• Line of sight / SIAM established

• First assessment of PSF achieved

• Few instrument/satellite anomalies observed so far

• No major problems encountered, yet

IAS map making workshop IAS, 10 July 2009

Page 32: PACS Status Report Herschel ST#38ESAC, 30 Jun 2009 Herschel map making workshop 10 July 2009 B.Altieri/E. Sturm for the PACS Team / HSC Herschel map making

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