pacs status report herschel st#38esac, 30 jun 2009 herschel map making workshop 10 july 2009...
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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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
16Spitzer/MIPS 160µm
Herschel/PACS 160µmHerschel/PACS70/100/160 µm
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
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
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
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
23PACS Status Report
Deglitching
• Multi-median resolution transform (MMT), Starck et al. 1998.
IAS map making workshop IAS, 10 July 2009
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
28PACS Status Report
1/f noise removal: simple high pass filter
IAS map making workshop IAS, 10 July 2009
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
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
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
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
33
• 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
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