CEA bolometer arrays: the first year in space

Billot, N.; Sauvage, M.; Rodriguez, L.; Horeau, B.; Kiss, Csaba; Aussel, H.; Okumura, K.; Boulade, O.; Altiéri, B.; Poglitsch, A.; Agnèse, P.

doi:10.1117/12.856449

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…This is the most common effect and in Section 3.3 we describe how to detect and mask the data for PACS, as well as to mask any possible residual glitches for SPIRE. Very powerful glitches, on the other hand, make the detector signal unstable for a considerable interval of time (see, e.g., Billot et al 2010). This effect depends on the glitch amplitude and on the bolometers time response.…”

Section: Corrupted Todsmentioning

confidence: 99%

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Data reduction pipeline for the Hi-GAL survey

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Calzoletti

Veneziani

et al. 2011

Monthly Notices of the Royal Astronomical Society

136

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We present the data reduction pipeline for the Herschel Infrared\ud Galactic Plane survey (Hi-GAL). Hi-GAL is a key project of the Herschel\ud satellite, which is mapping the inner part of the Galactic plane\ud (vertical bar l vertical bar <= 70 degrees and vertical bar b vertical\ud bar <= 1 degrees), using two Photodetector Array Camera and Spectrometer\ud (PACS) and three Spectral and Photometric Imaging Receiver (SPIRE)\ud frequency bands, from 70 to 500 mu m. Our pipeline relies only partially\ud on the Herschel Interactive Processing Environment (HIPE). It features\ud several newly developed routines to perform data reduction, including\ud accurate data culling, noise estimation and minimum variance map-making,\ud the latter performed with the ROMAGAL algorithm, a deep modification of\ud the ROMA code already tested on cosmological surveys. We discuss in\ud depth the properties of the Hi-GAL science demonstration phase data

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Section: Corrupted Todsmentioning

confidence: 99%

“…The core of ROMAGAL is the same of the ROMA code (de Gasperis et al 2005) where the input-output routines have been deeply modified to adapt to the HIPE generated dataset. ROMA-GAL inputs are the TOD generated by HIPE, pointing and transient flagging.…”

Section: From Roma To Romagalmentioning

confidence: 99%

Data reduction pipeline for the Hi-GAL survey

Traficante

Calzoletti

Veneziani

et al. 2011

Monthly Notices of the Royal Astronomical Society

136

130

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“…Though CSs do not see the primary mirror directly, their signals might be influenced via straylight. We also note that during the commisioning phase of the PACS Photometer the detector bias voltages were modified at OD128 (for more details see Billot et al, 2010). The discontinuity seen in the differential signal levels at around this epoch in Figure 10 (right) might be due to this bias change.…”

Section: Evolution Of Differential Cb Signalsmentioning

confidence: 99%

“…Using this database we searched for the dependencies of detector signal output on various instrument and satellite parameters. A prelimininary analysis of the CB signals and the features observed in the first year of the Herschel mission are summarized in Billot et al (2010).…”

Section: Introductionmentioning

confidence: 99%

PACS photometer calibration block analysis

et al. 2013

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The absolute stability of the PACS bolometer response over the entire mission lifetime without applying any corrections is about 0.5% (standard deviation) or about 8% peak-to-peak. This fantastic stability allows us to calibrate all scientific measurements by a fixed and time-independent response file, without using any information from the PACS internal calibration sources. However, the analysis of calibration block observations revealed clear correlations of the internal source signals with the evaporator temperature and a signal drift during the first half hour after the cooler recycling. These effects are small, but can be seen in repeated measurements of standard stars. From our analysis we established corrections for both effects which push the stability of the PACS bolometer response to about 0.2% (stdev) or 2% in the blue, 3% in the green and 5% in the red channel (peak-to-peak). After both corrections we still see a correlation of the signals with PACS FPU temperatures, possibly caused by parasitic heat influences via the Kevlar wires which connect the bolometers with the PACS Focal Plane Unit. No aging effect or degradation of the photometric system during the mission lifetime has been found. A. Moór

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“…The Herschel Space Observatory [8] with its 3.5 m telescope provided an excellent platform for FIR observations with unprecedented sensitivity, photometric accuracy and spatial resolution. The FIR instrument PACS [9] employed the largest detector arrays [2] ever flown in space. Its bolometer arrays needed to be cooled to an operational temperature of 285 mK, which was achieved by means of a 3 He sorption cooler inside the instrument.…”

Section: Introductionmentioning

confidence: 99%

Operations and performance of the PACS instrument 3He sorption cooler on board of the Herschel space observatory

et al. 2014

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A 3 He sorption cooler produced the operational temperature of 285 mK for the bolometer arrays of the Photodetector Array Camera and Spectrometer (PACS) instrument of the Herschel Space Observatory. This cooler provided a stable hold time between 60 and 73 h, depending on the operational conditions of the instrument. The respective hold time could be determined by a simple functional relation established early on in the mission and reliably applied by the scientific mission planning for the entire mission. After exhaustion of the liquid 3 He due to the heat input by the detector arrays, the cooler was recycled for the next operational period following a well established automatic procedure. We give an overview of the cooler operations and performance over the entire mission and distinguishing in-between the Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. M. Sauvage

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CEA bolometer arrays: the first year in space

Cited by 7 publications

References 12 publications

Data reduction pipeline for the Hi-GAL survey

Data reduction pipeline for the Hi-GAL survey

PACS photometer calibration block analysis

Operations and performance of the PACS instrument 3He sorption cooler on board of the Herschel space observatory

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