Herschel ST38 ESAC 30 Jun 2009 Herschel map

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

IAS map making workshop IAS, 10 July 2009 Herschel/PACS Commissioning Date OD Activities So, Mai 24, 09 Mo, Mai 25, 09 Di, Mai 26, 09 Mi, Mai 27, 09 Do, Mai 28, 09 Fr, Mai 29, 09 11 PACS switch on, SFT 12 13 14 15 16 Grating tuning - 1 Sa, Mai 30, 09 17 So, Mai 31, 09 Mo, Jun 1, 09 Di, Jun 2, 09 Mi, Jun 3, 09 Do, Jun 4, 09 Fr, Jun 5, 09 18 Grating tuning - 2 19 Grating tuning - 3 20 Chopper stability - 1 21 Grating tuning - 4 22 Chopper tuning -2 23 Sa, Jun 6, 09 24 So, Jun 7, 09 25 Mo, Jun 8, 09 26 FFT + dark measurement Di, Jun 9, 09 Mi, Jun 10, 09 Do, Jun 11, 09 Fr, Jun 12, 09 PACS Status Report 27 Chopper tuning (MTL) - 5, SPT SPEC, SPT PHOT, Bolo bias=0 28 Ge: Ga bias - 1, part 1 29 Ge: Ga bias - 1, part 2 30 3

IAS map making workshop IAS, 10 July 2009 Herschel/PACS Commissioning Sa, Jun 13, 09 31 end of OD: Cooler Recycling So, Jun 14, 09 32 Cryo cover open, Sneak Preview Mi, Jul 1, 09 49 Mo, Jun 15, 09 33 Chopper tuning (MTL) - 6, Telescope background Do, Jul 2, 09 50 Di, Jun 30, 09 48 SIAM Scan Search Di, Jun 16, 09 34 Fr, Jul 3, 09 51 Mi, Jun 17, 09 35 Sa, Jul 4, 09 52 Do, Jun 18, 09 36 Coarse Ge: Ga Bias, CS cooldown So, Jul 5, 09 53 SIAM Updates & Check Fr, Jun 19, 09 37 Coarse Ge: Ga Bias (dark) Mo, Jul 6, 09 54 Sa, Jun 20, 09 38 Bolometer Biases for Pointing - 1 Di, Jul 7, 09 55 So, Jun 21, 09 39 Mi, Jul 8, 09 56 Mo, Jun 22, 09 40 Do, Jul 9, 09 57 Di, Jun 23, 09 41 Fr, Jul 10, 09 58 Mi, Jun 24, 09 42 Sa, Jul 11, 09 59 Do, Jun 25, 09 43 Bolometer Biases for Pointing - 2, Coarse Ge. Ga Bias Fr, Jun 26, 09 44 So, Jul 12, 09 60 Mo, Jul 13, 09 61 Sa, Jun 27, 09 45 Di, Jul 14, 09 62 So, Jun 28, 09 46 Mi, Jul 15, 09 63 End of Co. P Mo, Jun 29, 09 47 Coarse Ge. Ga Bias (PACS Co. P completed) PACS Status Report 4

IAS map making workshop IAS, 10 July 2009 Herschel/PACS Performance Verification Do, Jul 16, 09 Fr, Jul 17, 09 Sa, Jul 18, 09 So, Jul 19, 09 Mo, Jul 20, 09 Di, Jul 21, 09 Mi, Jul 22, 09 Do, Jul 23, 09 Fr, Jul 24, 09 Sa, Jul 25, 09 So, Jul 26, 09 Mo, Jul 27, 09 Di, Jul 28, 09 Mi, Jul 29, 09 Do, Jul 30, 09 Fr, Jul 31, 09 Sa, Aug 1, 09 So, Aug 2, 09 Mo, Aug 3, 09 Di, Aug 4, 09 Mi, Aug 5, 09 Do, Aug 6, 09 Fr, Aug 7, 09 Sa, Aug 8, 09 So, Aug 9, 09 Mo, Aug 10, 09 Di, Aug 11, 09 Mi, Aug 12, 09 Do, Aug 13, 09 Fr, Aug 14, 09 Sa, Aug 15, 09 So, Aug 16, 09 Mo, Aug 17, 09 Di, Aug 18, 09 Mi, Aug 19, 09 Do, Aug 20, 09 Fr, Aug 21, 09 Sa, Aug 22, 09 So, Aug 23, 09 Mo, Aug 24, 09 Di, Aug 25, 09 Mi, Aug 26, 09 Do, Aug 27, 09 Fr, Aug 28, 09 Sa, Aug 29, 09 64 Start of PV 65 66 Cooler, Phot Setup, FPG 67 Spec Set Up, Spec flux 68 69 70 71 72 Cooler, Phot Setup, FPG 73 FPG, Spec Setup, Spec FPG 74 75 76 77 78 Cooler, Phot Setup, Bias (12 xgreen) 1. 1. 1 (8 xgreen, 3 xblue), Phot. Spatial, Spec. S Setup, 79 FPG 80 81 82 83 84 Cooler, Phot Setup, Bias (12 xblue) 851. 1. 1 (5 xblue), Spec. S Setup, FPG, Ge. Ga, IP, Flux 86 87 88 89 90 Spec Setup, Flux, FPG, Wave 91 Ge. Ga, IP, Wave, AOT, Spatial, FPG 92 93 94 95 96 Flux, Ge. Ga, IP, AOT 97 Cooler, Bias, Flux 98 Bias, Spatial Cooler, Bias, Flux, Spatial, Spec IP, Spec Flux, Spec 99 AOT 100 101 102 103 104 Cooler, Spatial, Bias, AOT, Flux 105 AOT, Flux 106 Cooler, AOT, Flux 107 AOT, Flux, Ge. Ga (1. 2. 3) 108 PACS Status Report So, Aug 30, 09 Mo, Aug 31, 09 Di, Sep 1, 09 Mi, Sep 2, 09 Do, Sep 3, 09 Fr, Sep 4, 09 Sa, Sep 5, 09 So, Sep 6, 09 Mo, Sep 7, 09 Di, Sep 8, 09 Mi, Sep 9, 09 Do, Sep 10, 09 Fr, Sep 11, 09 Sa, Sep 12, 09 So, Sep 13, 09 Mo, Sep 14, 09 Di, Sep 15, 09 Mi, Sep 16, 09 Do, Sep 17, 09 Fr, Sep 18, 09 Sa, Sep 19, 09 So, Sep 20, 09 Mo, Sep 21, 09 Di, Sep 22, 09 Mi, Sep 23, 09 Do, Sep 24, 09 Fr, Sep 25, 09 Sa, Sep 26, 09 So, Sep 27, 09 Mo, Sep 28, 09 Di, Sep 29, 09 Mi, Sep 30, 09 Do, Okt 1, 09 Fr, Okt 2, 09 Sa, Okt 3, 09 So, Okt 4, 09 Mo, Okt 5, 09 Di, Okt 6, 09 Mi, Okt 7, 09 Do, Okt 8, 09 Fr, Okt 9, 09 Sa, Okt 10, 09 So, Okt 11, 09 Mo, Okt 12, 09 Di, Okt 13, 09 Mi, Okt 14, 09 110 Flux, IP, Spatial, AOT 111 Spatial, Flux, AOT 112 Cooler, AOT, Spatial, Flux 113 Spatial, Flux, AOT 114 115 116 117 118 Cooler, Spatial, AOT 119 Flux, Spatial, AOT 120 121 122 123 124 Spatial, Flux, AOT 125 AOT, Spatial, Flux 126 127 128 Wave, AOT 129 AOT, Flux, Wave 130 Wave, Flux, AOT 131 Cooler, AOT, Flux 132 133 134 SPIRE/PACS parallel 135 SPIRE/PACS parallel 136 137 138 PACS TBD 139 PACS TBD 140 141 142 PACS TBD 143 PACS TBD 144 PACS TBD 145 PACS TBD 146 147 148 SPIRE/PACS parallel 149 SPIRE/PACS parallel 150 151 152 PACS TBD 153 PACS TBD 154 End of PV 5

IAS map making workshop IAS, 10 July 2009 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! PACS Status Report 6

IAS map making workshop IAS, 10 July 2009 Chopper • Needed for rapid modulation on/off source on sky • Also used to look at calibration sources • Performance as on ground - final optimisation coming PACS Status Report 7

IAS map making workshop IAS, 10 July 2009 Calibration Sources • Dynamics and temperature stability is nominal • Temperatures may have to be adjusted to match (lower) telescope background PACS Status Report 8

IAS map making workshop IAS, 10 July 2009 Filter Wheels • Needed to select “blue” (70µm) or “green” (100µm) photometer band • Needed to select 2 nd vs. 3 rd grating order in “blue” spectrometer • Nominal performance in orbit verified PACS Status Report 9

IAS map making workshop IAS, 10 July 2009 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 PACS Status Report 10

IAS map making workshop IAS, 10 July 2009 300 m. K 3 He 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 PACS Status Report Pump temperature is now stable when the "steady-state" heater current is applied. Leaks through thermal shunt are drastically reduced 11

IAS map making workshop IAS, 10 July 2009 300 m. K 3 He Sorption Cooler Operation Cold side runs 1 K colder than before. Better insulation in thermal shunt. Evaporator driven below 2 K by the cooling strap. More efficient cooling through the strap (temperature peak occurs before the end of pump strong heating) PACS Status Report Estimated operating time ~60 ht_hold = 72. 7 - 0. 19 * t_oper 12

IAS map making workshop IAS, 10 July 2009 Bolometer Operation • Qualitatively no difference to before launch • Glich rate 1/150 s-1 per pixel, glitch duration ~2 frames of 0. 1 s Bolometer array noise maps: black = no noise (blind), white = high noise (hot) PACS Status Report 13

IAS map making workshop IAS, 10 July 2009 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 PACS Status Report 14

PEP Meeting�IAS map making workshop IAS, 10 July 2009 Photometer “Sneak Preview” Herschel/PACS Images of M 51 (“Whirlpool Galaxy”) MADmap 160 µm 100 µm 70 µm © ESA & The PACS Consortium PACS Status Report 15

Herschel/PACS 160µm Herschel/PACS 70/100/160 µm Spitzer/MIPS 160µm 16

IAS map making workshop IAS, 10 July 2009 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-TN 029 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 PACS Status Report Right: Model 17

IAS map making workshop IAS, 10 July 2009 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 PACS Status Report 18

IAS map making workshop IAS, 10 July 2009 Predicted PSF from WFE • Effect explained (qualitatively) - telescope, not PACS • Thermo-elastic stress on M 1 • Strehl ratio / main beam efficiency under evaluation PACS Status Report 21

IAS map making workshop IAS, 10 July 2009 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. 35 arcsec – dz=5. 50 stdev 1. 19 arcsec – Note that these errors are based on two independent pointings (nod) each Consistent up to OD 53 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. PACS Status Report 22

IAS map making workshop IAS, 10 July 2009 Deglitching • Multi-median resolution transform (MMT), Starck et al. 1998. PACS Status Report 23

IAS map making workshop IAS, 10 July 2009 Flux-calibration • Will start : – once the final detector biases are implemented (adjusted to the final telescope temperature) – and the high gain is used. PACS Status Report 24

IAS map making workshop IAS, 10 July 2009 1/f noise removal: simple high pass filter PACS Status Report 28

IAS map making workshop IAS, 10 July 2009 Telescope Background nominal telescope background @ 108 K, 95 K, 85 K telescope background, OD 33 telescope background, OD 38 cryo-cover @ 86 K cryo-cover @ 72 K, in orbit • 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 PACS Status Report 29

IAS map making workshop IAS, 10 July 2009 Instrument Anomalies • Drop-outs in temperature sensor data • “Na. N” symptom - no explanation, yet; running tests • Could potentially affect T-control of calibration sources? No! PACS Status Report 30

IAS map making workshop IAS, 10 July 2009 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 Phot. Proj map reconstruction PACS Status Report 31

IAS map making workshop IAS, 10 July 2009 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 PACS Status Report 32

IAS map making workshop IAS, 10 July 2009 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 • Let’s keep fingers crossed. . . PACS Status Report 33

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