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Title: Thermal conductance characterization of a pressed copper rope strap between 0.13 K and 10 K

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. In conclusion, 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.

Authors:
 [1];  [1];  [2];  [2]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Technology Applications, Inc. (TAI), Boulder, CO (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1375037
Report Number(s):
FERMILAB-PUB-17-051-PPD
Journal ID: ISSN 0011-2275; 1610071
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Cryogenics
Additional Journal Information:
Journal Volume: 86; Journal Issue: C; Journal ID: ISSN 0011-2275
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Dhuley, R. C., Ruschman, M., Link, J. T., and Eyre, J.. Thermal conductance characterization of a pressed copper rope strap between 0.13 K and 10 K. United States: N. p., 2017. Web. doi:10.1016/j.cryogenics.2017.07.001.
Dhuley, R. C., Ruschman, M., Link, J. T., & Eyre, J.. Thermal conductance characterization of a pressed copper rope strap between 0.13 K and 10 K. United States. doi:10.1016/j.cryogenics.2017.07.001.
Dhuley, R. C., Ruschman, M., Link, J. T., and Eyre, J.. Wed . "Thermal conductance characterization of a pressed copper rope strap between 0.13 K and 10 K". United States. doi:10.1016/j.cryogenics.2017.07.001. https://www.osti.gov/servlets/purl/1375037.
@article{osti_1375037,
title = {Thermal conductance characterization of a pressed copper rope strap between 0.13 K and 10 K},
author = {Dhuley, R. C. and Ruschman, M. and Link, J. T. and Eyre, J.},
abstractNote = {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. In conclusion, 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.},
doi = {10.1016/j.cryogenics.2017.07.001},
journal = {Cryogenics},
number = C,
volume = 86,
place = {United States},
year = {Wed Jul 05 00:00:00 EDT 2017},
month = {Wed Jul 05 00:00:00 EDT 2017}
}

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Cited by: 2 works
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