1. Thermal conductance characterization of a pressed copper rope strap between 0.13 K and 10 K
- Author
-
M. Ruschman, J.T. Link, J. Eyre, and R.C. Dhuley
- Subjects
010302 applied physics ,Thermal contact conductance ,Materials science ,Liquid helium ,General Physics and Astronomy ,chemistry.chemical_element ,Conductance ,Atmospheric temperature range ,01 natural sciences ,Copper ,law.invention ,Thermal conductivity ,chemistry ,law ,0103 physical sciences ,Braid ,General Materials Science ,Composite material ,010306 general physics ,Electrical conductor - Abstract
Mechanically pressing the ends of a copper braid in solid copper is an effective way of constructing solderless conductive straps for cryogenic applications. In this paper we present thermal conductance data of such a copper strap measured using the two-heater one-thermometer method. The measurements span a wide temperature range of 0.13–10 K applicable to a variety of cryogenic systems employing liquid helium, pulse tube coolers, adiabatic demagnetization refrigerators, and others. Above ≈1.5 K, the braid thermal conductivity dominates the strap conductance resulting in a near-linear dependence with temperature. The variation with temperature below ≈1.5 K is near-quadratic indicating dominance of the pressed contact conductance at the strap ends. Electron-beam welding the braid to the strap ends is shown to be a promising solution for improving sub-Kelvin thermal conductance of the strap.
- Published
- 2017