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Electron confinement in multi-anode saw tooth silicon drift detectors with an anode pitch of 250 μm

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6 Author(s)
Sonsky, J. ; Interfaculty Reactor Inst., Delft Univ. of Technol., Netherlands ; Valk, H. ; Huizenga, J. ; Hollander, R.W.
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Recently it has been experimentally shown that saw tooth shaped p + strips allows confinement of drifting electrons in the lateral direction. This is achieved by means of potential gutters induced by an appropriate saw tooth design of p+ cathodes. The saw tooth period px (= anode pitch) is the parameter mainly determining the maximal capacity of confined charge. Up-to-now the confinement effect was experimentally observed with a saw tooth detector with px=500 μm. The final detector is intended to have an anode pitch of 250 μm. The simulation of a saw tooth configuration with px=250 μm, py=200 μm, and α=60° showed that potential gutters with a depth of 80 mV are produced assuming a drift field of 250 V/cm. We give experimental evidence of these shallow charge confining potential gutters

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Nuclear Science, IEEE Transactions on  (Volume:46 ,  Issue: 3 )