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Diminished electron cloud broadening in a silicon drift detector by sawtooth p+ strips

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6 Author(s)
J. Sonsky ; Interfaculty Reactor Inst., Delft Univ. of Technol., Netherlands ; H. Valk ; C. P. Allier ; R. W. Hollander
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Already in 1993, sawtooth-shaped p+ strips were proposed to diminish lateral diffusion in linear multi-anode silicon drift detectors. The sawtooth structure generates small electric fields directed parallel to the detector surface and perpendicular to the drift direction. These fields confine the drifting electrons within a sawtooth period, In this paper the authors present for the first time experimental proof of the applicability of the concept. For a sawtooth period of 500 μm, we have tested the confinement of electron clouds as a function of injected charge up to 5×106 electrons. The maximum number of electrons for which full confinement is achieved has been measured as a function of the potential gutter depth generated by different sawtooth angles

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IEEE Transactions on Nuclear Science  (Volume:46 ,  Issue: 1 )