The linearity response of the Planck-LFI flight model receivers

Mennella, A.; Villa, F.; Terenzi, L.; Cuttaia, F.; Battaglia, P.; Bersanelli, M.; Butler, R. C.; D'Arcangelo, O.; Artal, E.; Davis, R. J.; Frailis, M.; Franceschet, C.; Galeotta, S.; Gregorio, A.; Hughes, N.; Jukkala, P.; Kettle, D.; Kilpiä, V. H.; Laaninen, M.; Lapolla, P. M.; Leonardi, R.; Leutenegger, P.; Lowe, Stuart; Mandolesi, N.; Maris, M.; Meinhold, P. R.; Mendes, L.; Miccolis, M.; Morgante, G.; Roddis, N.; Sandri, M.; Silvestri, R.; Stringhetti, L.; Tomasi, M.; Tuovinen, J.; Valenziano, L.; Zacchei, A.; Varis, J.; Wilkinson, A.; Zonca, A.

doi:10.1088/1748-0221/4/12/t12011

Cited by 15 publications

(27 citation statements)

References 15 publications

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“…Best-fit parameters have been obtained from the non-linear fit to data acquired during instrument-level tests. The linearity factor was obtained by constraining it to be ±1% around the value found during calibration of individual receivers (see Mennella et al 2009). …”

Section: Discussionmentioning

confidence: 99%

“…This nonlinearity arises from the back-end RF amplification stage and detector diode, which show compression down to very low input powers. The nonlinear response has been thoroughly tested both on the individual back end modules (Mennella et al 2009) and during the RCA calibration campaign (Villa et al 2010) and has been shown to closely reproduce Eq. (2).…”

Section: Photometric Calibration Noise Temperature and Linearitymentioning

confidence: 99%

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Planckpre-launch status: Low Frequency Instrument calibration and expected scientific performance

Mennella¹,

Bersanelli²,

Butler

et al. 2010

A&A

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We present the calibration and scientific performance parameters of the Planck Low Frequency Instrument (LFI) measured during the ground cryogenic test campaign. These parameters characterise the instrument response and constitute our optimal pre-launch knowledge of the LFI scientific performance. The LFI shows excellent 1/ f stability and rejection of instrumental systematic effects; its measured noise performance shows that LFI is the most sensitive instrument of its kind. The calibration parameters will be updated during flight operations until the end of the mission.

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Section: Discussionmentioning

confidence: 99%

Section: Photometric Calibration Noise Temperature and Linearitymentioning

confidence: 99%

Planckpre-launch status: Low Frequency Instrument calibration and expected scientific performance

Mennella¹,

Bersanelli²,

Butler

et al. 2010

A&A

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“…Here we discuss the nonlinear response of the PLANCK LFI detectors, following Refs. [45][46][47]. Two state-of-the-art and complementary instruments are integrated in the focal plane of the PLANCK 1.5-meter dual reflector telescope.…”

Section: Nonlinear Response Of the Low Frequency Instrument Of The Plmentioning

confidence: 99%

Impact of instrumental systematics on the CMB bispectrum

Yadav

Shimon

et al. 2011

Phys. Rev. D

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We study the effects of instrumental systematics on the estimation of primordial non-Gaussianity using the cosmic microwave background (CMB) bispectrum from both the temperature and the polarization anisotropies. For temperature systematics we consider gain fluctuation and beam distortions. For polarization we consider effects related to known instrumental systematics: calibration, pixel rotation, differential gain, pointing, and ellipticity of the instrument beam. We consider these effects at the next to leading order, which we refer to as nonlinear systematic effects. We find that if the instrumental response is linearly proportional to the received CMB intensity, then only the shape of the primordial CMB bispectrum, if there is any, will be distorted. We show that the nonlinear response of the instrument can in general result in spurious non-Gaussian features on both the CMB temperature and polarization anisotropies, even if the primordial CMB is completely Gaussian. We determine the level for both the linear and nonlinear systematics parameters for which they would cause no significant degradation of our ability to constrain the primordial non-Gaussianity amplitude f NL . We find that the nonlinear systematics are potentially a bigger worry for extracting the primordial non-Gaussianity than the linear systematics, especially because the current and near future CMB probes are optimized for CMB power-spectrum measurements which are not particularly sensitive to the nonlinear instrument response. We find that if instrumental nonlinearities are not controlled by dedicated calibration, the effective local non-Gaussianity can be as large as f NL $ Oð10Þ before the corresponding nonlinearities show up in the CMB dipole measurements. The higher-order multipoles are even less sensitive to instrumental nonlinearities.

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“…This was discovered during the previous qualification campaign and has been well characterized during these flight model RCA tests. The non-linearity effects in LFI are discussed in Mennella et al (2009) together with its impact on the science performances. For a radiometer with compression effects the radiometer gain, G, is a function of total input temperature, T = T in + T sys and is given by…”

Section: Basic Propertiesmentioning

confidence: 99%

“…This formula does not include the non-linearity effects that are discussed in detail by Mennella et al (2009). The overall noise performances of all eleven RCAs are reported in Table 6, while Fig.…”

Section: Noise Propertiesmentioning

confidence: 99%

Planckpre-launch status: Calibration of the Low Frequency Instrument flight model radiometers

Villa¹,

Terenzi²,

Sandri³

et al. 2010

A&A

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The Low Frequency Instrument (LFI) on-board the ESA Planck satellite carries eleven radiometer subsystems, called radiometer chain assemblies (RCAs), each composed of a pair of pseudo-correlation receivers. We describe the on-ground calibration campaign performed to qualify the flight model RCAs and to measure their pre-launch performances. Each RCA was calibrated in a dedicated flight-like cryogenic environment with the radiometer front-end cooled to 20 K and the back-end at 300 K, and with an external input load cooled to 4 K. A matched load simulating a blackbody at different temperatures was placed in front of the sky horn to derive basic radiometer properties such as noise temperature, gain, and noise performance, e.g. 1/ f noise. The spectral response of each detector was measured as was their susceptibility to thermal variation. All eleven LFI RCAs were calibrated. Instrumental parameters measured in these tests, such as noise temperature, bandwidth, radiometer isolation, and linearity, provide essential inputs to the Planck-LFI data analysis.

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The linearity response of the Planck-LFI flight model receivers

Cited by 15 publications

References 15 publications

Planckpre-launch status: Low Frequency Instrument calibration and expected scientific performance

Planckpre-launch status: Low Frequency Instrument calibration and expected scientific performance

Impact of instrumental systematics on the CMB bispectrum

Planckpre-launch status: Calibration of the Low Frequency Instrument flight model radiometers

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