This vector-tensor system contains 13 integrated low-critical temperature (LTc) superconducting quantum interference devices (SQUIDs) inside a small cylindrical liquid helium Dewar with a height of 31 cm and 37 cm in diameter.
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For the magnetic characterization of such environments, we present a portable SQUID system that measures the absolute magnetic flux density vector and the gradient tensor. Several experiments in fundamental physics demand an environment of very low, homogeneous, and stable magnetic fields. Voigt, J Knappe-Grüneberg, S Gutkelch, D Haueisen, J Neuber, S Schnabel, A Burghoff, M It is concluded that absolute gain accuracies within + or - 0.30 to 0.40 db are possible, depending primarily on the repeatability (scatter) in the field data from Deep Space Network user stations.ĭevelopment of a vector-tensor system to measure the absolute magnetic flux density and its gradient in magnetically shielded rooms. The follow-on considerations to apply these results to an operational network of ground antennas are discussed. Third, using the calibrated large aperture directly, the absolute flux density of five selected galactic and extragalactic natural radio sources was determined with an absolute accuracy better than 2 percent, now quoted at the familiar 1 sigma confidence level. Second, a very careful transfer calibration technique using an artificial far-field coherent-wave source was used to accurately obtain the gain of one large (26 m) aperture. The program is considered unique in at least three ways first, absolute gain calibrations of high quality suppressed-sidelobe dual mode horns first provide a high accuracy foundation to the foundation to the program. A.Ī detailed description of a NASA/JPL Deep Space Network program to improve S-band gain calibrations of large aperture antennas is reported. Absolute flux density calibrations of radio sources: 2.3 GHzįreiley, A.
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