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Design and tests of high sensitivity NTD Ge thermometers for the Planck-High Frequency Instrument

Piat, M. and Torre, J. P. and Lamarre, J. M. and Beeman, J. W. and Bhatia, R. S. and Leriche, B. and Crussaire, J. P. and Langlet, F. (2002) Design and tests of high sensitivity NTD Ge thermometers for the Planck-High Frequency Instrument. In: Low temperature detectors. AIP Conference Proceedings. No.605. American Institute of Physics , Melville, NY, pp. 79-82. ISBN 0-7354-0049-0.

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The High Frequency Instrument of Planck needs high sensitivity semi-conductors at low temperature to monitor the temperature of the bolometer plate. We have modeled such thermometers by using a semi-analytical approach of Anderson insulators, taking into account both the electrical field and the electron/phonon decoupling effects. The optimized design uses convenient NTD Ge material and has larger dimension than the initial design. The first measurements of these optimized thermometers showed a significant thermal de-coupling effect due to Kapitza resistance with its mechanical support. Nevertheless, a sensitivity of about 8 nK.Hz^(–0.5), not far from the predicted one, was obtained. The noise spectrum of the thermometer was flat down to 1 Hz, dominated at lower frequency by the thermal fluctuations.

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Additional Information:© 2002 American Institute of Physics. Issue Date: 5 February 2002. We thank P. Garoche at Laboratoire de Physique des Solides in Orsay for fruitful discussions. The Symbol experiment is funded by CNES and supported by IAS.
Funding AgencyGrant Number
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Subject Keywords:bolometers, temperature sensors, temperature measurement, germanium, electric properties, frequency response, sensitivity, low-temperature techniques, radiofrequency cosmic radiation, astronomical instruments
Series Name:AIP Conference Proceedings
Issue or Number:605
Classification Code:PACS: 95.55.Rg
Record Number:CaltechAUTHORS:20111028-093354204
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27481
Deposited By: Tony Diaz
Deposited On:07 Nov 2011 18:24
Last Modified:09 Nov 2021 16:49

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