The influence of anisotropic electron drift velocity on the signal shapes of closed-end HPGe detectors

Mihailescu, Lucian; Gast, W.; Lieder, R.M.; Brands, H.; Jäger, Herbert

doi:10.1016/s0168-9002(99)01286-3

Cited by 66 publications

(26 citation statements)

References 24 publications

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“…We see that the core T30 increases as a function of the radius which clearly illustrates the effect of the anisotropic drift velocity. On the other hand, the T90 parameter is more complex as it is smallest at medium radius which confirms the effect of the combination of the overall charge carrier drifts [34,35].…”

Section: Single Front Face Scanningmentioning

confidence: 73%

New setup for the characterisation of the AGATA detectors

Korichi

Blanc

et al. 2013

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Single Front Face Scanningmentioning

confidence: 73%

New setup for the characterisation of the AGATA detectors

Korichi

Blanc

et al. 2013

Nuclear Instruments and Methods in Physics Research Section A:

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“…Frequently this final step is difficult or is not implemented. However, in situ sourcecalibration techniques [34,35,36] have the capability of determining the relative angle between different HPGe detectors due to the anisotropy in the charge carrier drift velocity with respect to the crystal axes. As a result, some future experiments may find that the relative angle between detectors is known better than the absolute solar angle.…”

Section: Experimental Techniquesmentioning

confidence: 99%

Solar axion search technique with correlated signals from multiple detectors

Elliott

2017

Astroparticle Physics

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The coherent Bragg scattering of photons converted from solar axions inside crystals would boost the signal for axionphoton coupling enhancing experimental sensitivity for these hypothetical particles. Knowledge of the scattering angle of solar axions with respect to the crystal lattice is required to make theoretical predications of signal strength. Hence, both the lattice axis angle within a crystal and the absolute angle between the crystal and the Sun must be known. In this paper, we examine how the experimental sensitivity changes with respect to various experimental parameters. We also demonstrate that, in a multiple-crystal setup, knowledge of the relative axis orientation between multiple crystals can improve the experimental sensitivity, or equivalently, relax the precision on the absolute solar angle measurement. However, if absolute angles of all crystal axes are measured, we find that a precision of 2 • − 4 • will suffice for an energy resolution of σ E = 0.04E and a flat background. Finally, we also show that, given a minimum number of detectors, a signal model averaged over angles can substitute for precise crystal angular measurements, with some loss of sensitivity.

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“…The measured drift velocities [27][28][29], v e/h , along the axes 100 and 111 with E(x) 100 for x on 100 and E(x) 111 for x on 111 , respectively, are parametrized well [1,28] for E = |E(x)| < 300 V/mm by where μ 0 e/h , E 0 and β are parameters determined by fitting. The parameters μ 0 e/h represent the linear relation between v and E at large T crystal and low E. The parameters E 0 and β are used to model the deviation from this linear relation at low lattice temperature and high electric fields.…”

Section: Drift Of Charge Carriersmentioning

confidence: 99%

“…The model used for the electron drift [28] is based on the idea that the conduction band in a germanium crystal reaches its minimal potential in regions around the four equivalent 111 axes. Free electrons effectively only populate these regions.…”

Section: Drift Of Charge Carriersmentioning

confidence: 99%

“…A fundamental problem is the input concerning the mobilities. Figure 10 demonstrates how the pulses of events starting at the outer mantle and observed in the core are stretched if a different set [28] of input parameters for the electron mobility is chosen. At V bias = 3000 V and ρ imp = 0.66 · 10 10 /cm 3 , the pulse is 14% longer than with the default input parameters [27].…”

Section: Uncertainties Of the Simulationmentioning

confidence: 99%

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Pulse shape simulation for segmented true-coaxial HPGe detectors

et al. 2010

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A new package to simulate the formation of electrical pulses in segmented true-coaxial high purity germanium detectors is presented. The computation of the electric field and weighting potentials inside the detector as well as of the trajectories of the charge carriers is described. In addition, the treatment of bandwidth limitations and noise are discussed. Comparison of simulated to measured pulses, obtained from an 18-fold segmented detector operated inside a cryogenic test facility, are presented.

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The influence of anisotropic electron drift velocity on the signal shapes of closed-end HPGe detectors

Cited by 66 publications

References 24 publications

New setup for the characterisation of the AGATA detectors

New setup for the characterisation of the AGATA detectors

Solar axion search technique with correlated signals from multiple detectors

Pulse shape simulation for segmented true-coaxial HPGe detectors

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