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12 July 2018 A new pulse shape description for α particle pulses in a highly-sensitive sub-Kelvin bolometer
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The next generation of cosmology space missions will be sensitive to parasitic signals arising from cosmic rays. Using a composite bolometer, we have investigated pulses produced by α particles in order to understand the movement of energy produced by ionising radiation. Using a series of measurements at 100 mK, we have compared the typical fitting algorithm (a mathematical model) with a second method of pulse interpretation by convolving the detector’s thermal response function with a starting profile of thermalised athermal phonons, taking into account the effects of heat propagation. Using this new fitting method, we have eliminated the need for a non-physical quadratic nonlinearity factor produced using more common methods, and we find a pulse form in good agreement with known aspects of thermal physics. This work is carried forward in the effort to produce a physical model for energy deposition in this detector. The modelling is motivated by the reproduction of statistical features in the experimental dataset, and the new interpretation of α pulse shapes represents an improvement in the current understanding of the energy propagation mechanisms in this detector.
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S. L. Stever, F. Couchot, N. Coron, R. M. J. Janssen, and B. Maffei "A new pulse shape description for α particle pulses in a highly-sensitive sub-Kelvin bolometer", Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 1069863 (12 July 2018);

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