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This content will become publicly available on July 5, 2018

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

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