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A high-performance wave guide cryogenic thermal break
S. J. Melhuish, E. J. Blackhurst, L. Martinis, M. McCulloch, R. J. Davis, L. Piccirillo, and D. George, in 7th European Microwave Integrated Circuits Conference (EuMIC), 2012 (IEEE, 2012), pp. 393–396.
J. L. C. de Diego, “Cryogenic technology in the microwave engineering: Application to MIC and MMIC very low noise amplifier desig,” Ph.D. thesis, Departamento de Ingenieria de Comunicacione, 2010.
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We describe a high-performance wave guide cryogenic thermal break. This has been constructed both for Ka band, using WR28 wave guide, and Q band, using WR22 wave guide. The mechanical structure consists of a hexapod (Stewart platform) made from pultruded carbon fibre tubing. We present a tentative examination of the cryogenic Young’s modulus of this material. The thermal conductivity is measured at temperatures above the range explored by Runyan and Jones, resulting in predicted conductive loads through our thermal breaks of 3.7 mW to 3 K and 17 μK to 1 K.
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