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Time Dependence of Partial Integrated Charge Fluctuations in STJs

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Abstract

Multiple tunneling of quasiparticles in a superconducting tunnel junction (STJ) detector increases the fluctuations in the measured charge. To optimize the energy resolution of an STJ detector, it is necessary to know the time dependence of the integrated charge and its noise. In this work, the theory of branching cascade processes was applied to the process of quasiparticle multitunneling. The duality nature of quasiparticles and the coupling of the quasiparticle and the phonon subsystems were taken into account. The formulae for time dependences of the mean value and the relative variance of the integrated charge were derived. Influence of a shaping amplifier on the relative variance of an STJ detector was also considered.

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Authors and Affiliations

  1. National Research Nuclear University (Moscow Engineering Physics Institute), Moscow, Russia

    Victor V. Samedov

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  1. Victor V. Samedov
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Correspondence to Victor V. Samedov.

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Samedov, V.V. Time Dependence of Partial Integrated Charge Fluctuations in STJs. J Low Temp Phys 176, 228–236 (2014). https://doi.org/10.1007/s10909-014-1110-z

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  • DOI: https://doi.org/10.1007/s10909-014-1110-z

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