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Position sensitivity of the proposed segmented germanium detectors for the DESPEC project
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.ORCID iD: 0000-0003-1771-2656
2009 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 604, no 1/2, 56-59 p.Article in journal (Refereed) Published
Abstract [en]

The DESPEC HPGe array is a part of the NuSTAR project at FAIR, Germany. It is aimed at the spectroscopy of the stopped decaying exotic nuclei. Segmented gamma-ray tracking detectors are proposed for this array in order to maximize detection efficiency and background suppression when searching for very rare events. Two types of detector modules-stacks of three 16-fold segmented planar crystals and 12- and 16-fold segmented clover detectors-have been investigated and compared from the point of view of the achievable position resolution using pulse shape analysis (PSA). To this end, detector signals from realistic gamma-ray interactions have been calculated. These signals were treated by PSA in order to reconstruct the photon interaction locations. Comparing the initial interaction locations to the reconstructed ones, it was found that the double-sided strip planar detector yielded position reconstruction errors at least a factor 2 lower than the other detectors considered

Place, publisher, year, edition, pages
2009. Vol. 604, no 1/2, 56-59 p.
Keyword [en]
DESPEC, Segmented germanium detector, Pulse shape analysis, Matrix method
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-11998DOI: 10.1016/j.nima.2009.01.080ISI: 000267405700017Scopus ID: 2-s2.0-65749100014OAI: oai:DiVA.org:kth-11998DiVA: diva2:292895
Note
QC 20110211(8th International Conference on Position Sensitive Detectors Univ Glasgow, Glasgow, SCOTLAND, SEP 01-05, 2008) Available from: 2010-02-10 Created: 2010-02-10 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Position-sensitive germanium detectors for gamma-ray tracking, imaging and polarimetry
Open this publication in new window or tab >>Position-sensitive germanium detectors for gamma-ray tracking, imaging and polarimetry
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Modern germanium detectors are often manufactured with two-dimensionally segmented electrical contacts. Signals induced in each segment are read out simultaneously when a photon is detected. Detailed pulse shape analysis (PSA) of these signals allows to resolve positions of individual γ-ray interactions with a precision of at least a few mm. The track of a photon can then be reconstructed using γ-ray tracking. Using these techniques, highly efficient large-volume germanium detectors can replace detector systems where previously highly granulated detector arrays were required, and/or large fractions of photons had to be rejected. The ability to reconstruct the direction of an incoming photon and its scattering path makes it possible to use segmented detectors for γ-ray imaging and polarimetry. Doppler correction of photon energies in experiments where γ rays are emitted from fast ion beams can be greatly improved due to improved determination of the emission angle with respect to the beam. Furthermore, arrays of many detectors can be built without the need for conventional anticoincidence detectors for escape suppression. Instead, photons escaping a detector crystal can be tracked through neighbouring ones.

In this work position reconstruction accuracy was evaluated for segmented detectors in a number of geometries in realistic applications. Particular emphasis has been put on the reconstruction of data sets containing events of arbitrary complexity in terms of the number of hit segments and interactions per segment. The imaging and polarization sensitivities of a single planar germanium pixel detector have been evaluated experimentally. In these measurements, photons absorbed in two, often adjacent, segments were reconstructed. Simulated interactions of γ-rays with the detectors of the proposed DESPEC germanium array were analysed yielding the position resolution obtainable in realistic experimental situations, as well as its dependence on photon energy, event complexity, noise and other sources of error.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. viii, 88 p.
Series
TRITA-FYS, ISSN 0280-316X ; 2010:04
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-11996 (URN)978-91-7415-555-6 (ISBN)
Public defence
2010-02-26, FB54, Roslagstullsbacken 21, AlbaNova, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170222

Available from: 2010-02-10 Created: 2010-02-09 Last updated: 2017-02-22Bibliographically approved

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Cederwall, Bo

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