Characterisation of an n-type segmented BEGe detector

Abt, I.; Caldwell, A.; Dönmez, Burçin; Etrillard, C.; Gooch, C.; Hauertmann, Lukas; Lampert, M.-O.; Liao, H.; Liu, X.; Ma, Hui; Majorovits, B.; Schulz, O.; Schuster, M.

doi:10.1016/j.nima.2019.02.005

Cited by 5 publications

(15 citation statements)

References 12 publications

(11 reference statements)

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“…The first detector operated in the Compton Scanner was an n-type segmented Broad Energy Germanium (segBEGe) detector [34]. A schematic of this detector is depicted in Fig.…”

Section: N-type Segbege Detectormentioning

confidence: 99%

“…5c. For the n-type segBEGe detector, the energy resolution at 356.017 keV is 0.74% FWHM [34]. When reconstructing θ using the energy deposited in the segBEGe detector, the resolution is slightly improved to 1.52 mm FWHM at r = 0 mm and to 1.09 mm FWHM at r = 36 mm.…”

Section: Intrinsic Spatial Resolutionmentioning

confidence: 99%

“…where A 0 = (158.1 ± 1.2) • is the offset between φ = 0 • and the zero of the rotational motor stage. The value of A 0 was determined by measuring the position of the segment boundaries in rotational motor coordinates [34]. In the following, all motor stage positions are converted to detector coordinates using Eqs.…”

Section: Spatial Alignmentmentioning

confidence: 99%

“…The event selection for the analysis was performed using only coincident events. Events were selected if the energy in the segBEGe detector, E det , as determined from the core pulse [34] and the total energy detected in the pixelated camera, E cam , added up to the characteristic energy of the gammas from the 137 Cs source, i.e. E det + E cam = (662 ± 8) keV.…”

Section: Event Selectionmentioning

confidence: 99%

“…At the center height of the detector, i.e. at z = 20 mm, the electric field in the segBEGe detector points primarily inwards in r-direction [19,34]. There, the electrons Fig.…”

Section: Comparison Of Simulated To Measured Pulsesmentioning

confidence: 99%

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A novel wide-angle Compton Scanner setup to study bulk events in germanium detectors

Abt¹,

Gooch²,

Hagemann³

et al. 2022

Preprint

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A novel Compton Scanner setup has been built, commissioned and operated at the Max-Planck-Institute for Physics in Munich to study pulse shapes from bulk events in high-purity germanium detectors. In this fully automated setup, the detector under test is irradiated from the top with 661.660 keV gammas, some of which Compton scatter inside the detector. The interaction points in the detector can be reconstructed when the scattered gammas are detected with a pixelated camera placed at the side of the detector. This allows for the creation of position-dependent pulse shape libraries. The wide range of accepted Compton angles results in shorter measurement times in comparison to similar setups where only perpendicularly scattered gammas are selected by slit collimators. In this paper, the construction of the Compton Scanner, its alignment and the procedure to reconstruct interaction points in the germanium detector are described in detail. The creation of a first pulse shape library for an n-type segmented point-contact germanium detector is described. Selected pulses are compared to simulated pulses to demonstrate the power of such pulse shape libraries to better understand the charge carrier drift in germanium.

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“…The first detector operated in the Compton Scanner was an n-type segmented Broad Energy Germanium (segBEGe) detector [34]. A schematic of this detector is depicted in Fig.…”

Section: N-type Segbege Detectormentioning

confidence: 99%

Section: Intrinsic Spatial Resolutionmentioning

confidence: 99%

Section: Spatial Alignmentmentioning

confidence: 99%

Section: Event Selectionmentioning

confidence: 99%

“…At the center height of the detector, i.e. at z = 20 mm, the electric field in the segBEGe detector points primarily inwards in r-direction [19,34]. There, the electrons Fig.…”

Section: Comparison Of Simulated To Measured Pulsesmentioning

confidence: 99%

See 3 more Smart Citations

A novel wide-angle Compton Scanner setup to study bulk events in germanium detectors

Abt¹,

Gooch²,

Hagemann³

et al. 2022

Preprint

Self Cite

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show abstract

Simulation of semiconductor detectors in 3D with SolidStateDetectors.jl

Abt¹,

Fischer²,

Hagemann³

et al. 2021

J. Inst.

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The open-source software package SolidStateDetectors.jl to calculate the fields and simulate the drifts of charge carriers in solid state detectors, especially in large volume high-purity germanium detectors, together with the corresponding pulses, is introduced. The package can perform all calculations in full 3D while it can also make use of detector symmetries. The effect of the surroundings of a detector can also be studied. The package is programmed in the user friendly and performance oriented language julia, such that 3D field calculations and drift simulations can be executed efficiently and in parallel. The package was developed for high-purity germanium detectors, but it can be adjusted by the user to other types of semiconductors. The verification of the package is shown for an n-type segmented point-contact germanium detector. Additional features of SolidStateDetectors.jl, which are under development are listed.

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Temperature dependence of the electron-drift anisotropy and implications for the electron-drift model

Abt,

Gooch,

Hagemann

et al. 2023

J. Inst.

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The electron drift in germanium detectors is modeled making many assumptions. Confronted with data, these assumptions have to be revisited. The temperature dependence of the drift of electrons was studied in detail for an n-type segmented point-contact germanium detector. The detector was mounted in a temperature controlled, electrically cooled cryostat. Surface events were induced with collimated 81 keV photons from a 133Ba source. A detailed analysis of the rise time of pulses collected in surface scans, performed at different temperatures, is presented. The longitudinal anisotropy of the electron drift decreases with rising temperature. A new approach, making use of designated rise-time windows determined by simulations using SolidStateDetectors.jl, was used to isolate the longitudinal drift of electrons along different axes to quantify this observation. The measured temperature dependence of the longitudinal drift velocities combined with the standard electron-drift model as widely used in relevant simulation packages results in unphysical predictions. A modification of the electron-drift model based on assuming phonons to be the dominating scattering centers for electrons is motivated and described. The results of a first implementation of the modified model in SolidStateDetectors.jl are shown. They describe the temperature dependence of the data reasonably well. A general review of the model and the standard input values for mobilities is suggested.

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Characterisation of an n-type segmented BEGe detector

Cited by 5 publications

References 12 publications

A novel wide-angle Compton Scanner setup to study bulk events in germanium detectors

A novel wide-angle Compton Scanner setup to study bulk events in germanium detectors

Simulation of semiconductor detectors in 3D with SolidStateDetectors.jl

Temperature dependence of the electron-drift anisotropy and implications for the electron-drift model

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