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

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>05/2002
<mark>Journal</mark>Physica B: Condensed Matter
Number of pages3
<mark>Original language</mark>English


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.