Quasiparticle diffusion over several mm in cryogenic detectors

M. Loidl, S. Cooper, O. Meier, F. Pröbst, G. Sáfrán, W. Seidel, M. Sisti, L. Stodolsky, S. Uchaikin

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


The use of quasiparticle diffusion in a superconducting film has the potential to allow an increase in the size of a cryogenic detector without proportional loss of energy resolution. The quasiparticle lifetime and the diffusion constant are critical parameters which have limited this development. Using W superconducting phase transition thermometers as the sensors and a W/Al bilayer as the diffusion film, we have measured quasiparticle diffusion over a distance of 2 mm and deduced a diffusion constant of D = 2.5 × 10-4 m2/s and a quasiparticle lifetime of τ = 9.0 ms, which is, to our knowledge, by far the longest ever observed. With Ir/Au thermometers and an Ir/Au/Al diffusion film we found D = 4.6 × 10-3 m2/s and τ = 0.43 ms with diffusion over 4 mm, the longest distance observed to date.

Original languageEnglish
Pages (from-to)440-446
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2-3
Publication statusPublished - 11 Jun 2001


  • Cryogenic detector
  • Quasiparticle diffusion
  • Superconducting films

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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