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Signals induced by charge-trapping in EDELWEISS FID detectors: analytical modeling and applications

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arxiv 1606.08097 v2 pith:LPNBSAX4 submitted 2016-06-26 physics.ins-det astro-ph.COastro-ph.IM

Signals induced by charge-trapping in EDELWEISS FID detectors: analytical modeling and applications

classification physics.ins-det astro-ph.COastro-ph.IM
keywords detectorsenergyionizationanalyticalelectrodesheatinducedsignals
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The EDELWEISS-III direct dark matter search experiment uses cryogenic HP-Ge detectors Fully covered with Inter-Digitized electrodes (FID). They are operated at low fields ($<1\;\mathrm{V/cm}$), and as a consequence charge-carrier trapping significantly affects both the ionization and heat energy measurements. This paper describes an analytical model of the signals induced by trapped charges in FID detectors based on the Shockley-Ramo theorem. It is used to demonstrate that veto electrodes, initially designed for the sole purpose of surface event rejection, can be used to provide a sensitivity to the depth of the energy deposits, characterize the trapping in the crystals, perform heat and ionization energy corrections and improve the ionization baseline resolutions. These procedures are applied successfully to actual data.

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