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Heat pulse studies of quasiparticle dynamics in superconducting tunnel junction photon detectors.

Research output: Contribution to journalJournal article

Published

Journal publication date05/2002
JournalPhysica B: Condensed Matter
Journal number1
Volume316-31
Number of pages3
Pages583-585
Original languageEnglish

Abstract

We describe experiments to characterise the responsivity of superconducting tunnel junction (STJ) X-ray detectors in which the absorbed photons were simulated by heat pulses. Independent values of tunnel and loss times could be inferred from the time variation of the STJ current, whilst its integration gave the total charge output. The effects of self-recombination and trapped magnetic flux could also be determined. Results were obtained at 1.3 K for a Nb STJ, and at 20 mK for a Ta device.