Effect of a surface channel on the performance of a P-type Point Contact HPGe detector

R. J. Cooper; D. C. Radford; E. Hull; K. Lagergren; P. Mullowney; M. C. Lin; K. Paul; C. Athens; M. Loh

doi:10.1016/j.nima.2012.04.005

Effect of a surface channel on the performance of a P-type Point Contact HPGe detector

R. J. Cooper, D. C. Radford, E. Hull, K. Lagergren, P. Mullowney, M. C. Lin, K. Paul, C. Athens, M. Loh

Physics Division

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The observation of anomalous charge collection in a P-type Point Contact (PPC) High Purity Germanium (HPGe) detector is reported. By studying preamplifier charge signals from the detector, these anomalous events are shown to be consistent with charge carrier drift along the surface of the detector, prior to collection at the contact. It is believed that these events arise from the formation of a surface channel in the detector. By coupling analysis of these experimental signals with field calculations, an estimate of the radial drift velocity of holes at the surface has been made. This value is found to be around 40 times slower than the accepted value for saturated hole drift in the bulk, and is in good agreement with that calculated using a newly developed technique for modelling carrier transport.

Original language	English
Pages (from-to)	48-55
Number of pages	8
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	680
DOIs	https://doi.org/10.1016/j.nima.2012.04.005
State	Published - Jul 11 2012

Funding

Research sponsored by the U.S. Department of Energy Office of Science, Office of Nuclear Physics . Also supported by U.S. Department of Energy Office of Science , Office of Nuclear Physics Grant DE-FG02-07ER84758 . The Joint Institute for Heavy Ion Research has as member institutions: the University of Tennessee, Vanderbilt University, and the Oak Ridge National Laboratory; it is supported by the members and by the U.S. Department of Energy .

Keywords

HPGe detector
Mobility
Modelling
Surface channel

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10.1016/j.nima.2012.04.005

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Cooper, R. J., Radford, D. C., Hull, E., Lagergren, K., Mullowney, P., Lin, M. C., Paul, K., Athens, C., & Loh, M. (2012). Effect of a surface channel on the performance of a P-type Point Contact HPGe detector. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 680, 48-55. https://doi.org/10.1016/j.nima.2012.04.005

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title = "Effect of a surface channel on the performance of a P-type Point Contact HPGe detector",

abstract = "The observation of anomalous charge collection in a P-type Point Contact (PPC) High Purity Germanium (HPGe) detector is reported. By studying preamplifier charge signals from the detector, these anomalous events are shown to be consistent with charge carrier drift along the surface of the detector, prior to collection at the contact. It is believed that these events arise from the formation of a surface channel in the detector. By coupling analysis of these experimental signals with field calculations, an estimate of the radial drift velocity of holes at the surface has been made. This value is found to be around 40 times slower than the accepted value for saturated hole drift in the bulk, and is in good agreement with that calculated using a newly developed technique for modelling carrier transport.",

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year = "2012",

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doi = "10.1016/j.nima.2012.04.005",

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Cooper, RJ, Radford, DC, Hull, E, Lagergren, K, Mullowney, P, Lin, MC, Paul, K, Athens, C & Loh, M 2012, 'Effect of a surface channel on the performance of a P-type Point Contact HPGe detector', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 680, pp. 48-55. https://doi.org/10.1016/j.nima.2012.04.005

TY - JOUR

T1 - Effect of a surface channel on the performance of a P-type Point Contact HPGe detector

AU - Cooper, R. J.

AU - Radford, D. C.

AU - Hull, E.

AU - Lagergren, K.

AU - Mullowney, P.

AU - Lin, M. C.

AU - Paul, K.

AU - Athens, C.

AU - Loh, M.

PY - 2012/7/11

Y1 - 2012/7/11

N2 - The observation of anomalous charge collection in a P-type Point Contact (PPC) High Purity Germanium (HPGe) detector is reported. By studying preamplifier charge signals from the detector, these anomalous events are shown to be consistent with charge carrier drift along the surface of the detector, prior to collection at the contact. It is believed that these events arise from the formation of a surface channel in the detector. By coupling analysis of these experimental signals with field calculations, an estimate of the radial drift velocity of holes at the surface has been made. This value is found to be around 40 times slower than the accepted value for saturated hole drift in the bulk, and is in good agreement with that calculated using a newly developed technique for modelling carrier transport.

AB - The observation of anomalous charge collection in a P-type Point Contact (PPC) High Purity Germanium (HPGe) detector is reported. By studying preamplifier charge signals from the detector, these anomalous events are shown to be consistent with charge carrier drift along the surface of the detector, prior to collection at the contact. It is believed that these events arise from the formation of a surface channel in the detector. By coupling analysis of these experimental signals with field calculations, an estimate of the radial drift velocity of holes at the surface has been made. This value is found to be around 40 times slower than the accepted value for saturated hole drift in the bulk, and is in good agreement with that calculated using a newly developed technique for modelling carrier transport.

KW - HPGe detector

KW - Mobility

KW - Modelling

KW - Surface channel

UR - https://www.scopus.com/pages/publications/84860271167

U2 - 10.1016/j.nima.2012.04.005

DO - 10.1016/j.nima.2012.04.005

M3 - Article

AN - SCOPUS:84860271167

SN - 0168-9002

VL - 680

SP - 48

EP - 55

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

ER -

Effect of a surface channel on the performance of a P-type Point Contact HPGe detector

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