Use of superconducting bearings to measure the polarization of the cosmic microwave background radiation.

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Measurements of the polarization of the cosmic microwave background (CMB) radiation are expected to significantly increase our understanding of the early universe. We present a design for a CMB polarimeter in which a cryogenically cooled half wave plate rotates by means of a high-temperature superconducting (HTS) bearing. The design is optimized for implementation in MAXIPOL, a balloon-borne CMB polarimeter. A prototype bearing, consisting of commercially available ring-shaped permanent magnet and an array of YBCO bulk HTS material, has been constructed. We report on measurements of the coefficient of friction as a function of temperature between 15 and 80 K, of ... continued below

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Hanany, S.; Matsumura, T.; Johnson, B.; Jones, T.; Hull, J. R. & Ma, K. B. August 21, 2002.

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Measurements of the polarization of the cosmic microwave background (CMB) radiation are expected to significantly increase our understanding of the early universe. We present a design for a CMB polarimeter in which a cryogenically cooled half wave plate rotates by means of a high-temperature superconducting (HTS) bearing. The design is optimized for implementation in MAXIPOL, a balloon-borne CMB polarimeter. A prototype bearing, consisting of commercially available ring-shaped permanent magnet and an array of YBCO bulk HTS material, has been constructed. We report on measurements of the coefficient of friction as a function of temperature between 15 and 80 K, of rotation frequency between 0.3 and 3.5 Hz, of levitation distance between 6 and 10 mm, and of ambient pressure between 1 and 10{sup -7} torr. The low rotational drag of the HTS bearing allows rotations for long periods of time with minimal input power and negligible wear and tear thus making this technology suitable for a future satellite mission.

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  • Applied Superconductivity Conference and Expo (ASC 2002), Houston, TX (US), 08/04/2002--08/09/2002

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  • Report No.: ANL/ET/CP-106853
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 799835
  • Archival Resource Key: ark:/67531/metadc739293

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  • August 21, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 24, 2016, 3:30 p.m.

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Hanany, S.; Matsumura, T.; Johnson, B.; Jones, T.; Hull, J. R. & Ma, K. B. Use of superconducting bearings to measure the polarization of the cosmic microwave background radiation., article, August 21, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc739293/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.