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Title: High-energy 3D calorimeter for use in gamma-ray astronomy based on position-sensitive virtual Frisch-grid CdZnTe detectors

Here, we will present a concept for a calorimeter based on a novel approach of 3D position-sensitive virtual Frisch-grid CdZnTe (hereafter CZT) detectors. This calorimeter aims to measure photons with energies from ~100 keV to 20–50 MeV . The expected energy resolution at 662 keV is better than 1% FWHM, and the photon interaction position-measurement accuracy is better than 1 mm in all 3 dimensions. Each CZT bar is a rectangular prism with typical cross-section from 5×5 to 7×7 mm 2 and length of 2–4 cm. The bars are arranged in modules of 4×4 bars, and the modules themselves can be assembled into a larger array. The 3D virtual voxel approach solves a long-standing problem with CZT detectors associated with material imperfections that limit the performance and usefulness of relatively thick detectors (i.e., >1 cm). Also, it allows us to use the standard (unselected) grade crystals, while achieving the energy resolution of the premium detectors and thus substantially reducing the cost of the instrument. Such a calorimeter can be successfully used in space telescopes that use Compton scattering of γ-rays, such as AMEGO, serving as part of its calorimeter and providing the position and energy measurement for Compton-scattered photons (likemore » a focal plane detector in a Compton camera). Also, it could provide suitable energy resolution to allow for spectroscopic measurements of γ-ray lines from nuclear decays.« less
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [3] ;  [2]
  1. CRESST/NASA/GSFC and Univ. of Maryland, College Park, Greenbelt, MD (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. NASA/GSFC, Greenbelt, MD (United States)
  4. Savannah River National Lab., Savannah River, SC (United States)
Publication Date:
Report Number(s):
SRNL-STI-2017-00748
Journal ID: ISSN 1748-0221
Grant/Contract Number:
AC09-08SR22470
Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 12; Journal Issue: 12; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Research Org:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Calorimeters; Gamma detectors (scintillators, CZT, HPG, HgI etc); Space instrumentation; Gamma telescopes
OSTI Identifier:
1439432

Moiseev, Alexander, Bolotnikov, A., DeGeronimo, G., Hays, E., James, R., Thompson, D., and Vernon, E.. High-energy 3D calorimeter for use in gamma-ray astronomy based on position-sensitive virtual Frisch-grid CdZnTe detectors. United States: N. p., Web. doi:10.1088/1748-0221/12/12/c12037.
Moiseev, Alexander, Bolotnikov, A., DeGeronimo, G., Hays, E., James, R., Thompson, D., & Vernon, E.. High-energy 3D calorimeter for use in gamma-ray astronomy based on position-sensitive virtual Frisch-grid CdZnTe detectors. United States. doi:10.1088/1748-0221/12/12/c12037.
Moiseev, Alexander, Bolotnikov, A., DeGeronimo, G., Hays, E., James, R., Thompson, D., and Vernon, E.. 2017. "High-energy 3D calorimeter for use in gamma-ray astronomy based on position-sensitive virtual Frisch-grid CdZnTe detectors". United States. doi:10.1088/1748-0221/12/12/c12037. https://www.osti.gov/servlets/purl/1439432.
@article{osti_1439432,
title = {High-energy 3D calorimeter for use in gamma-ray astronomy based on position-sensitive virtual Frisch-grid CdZnTe detectors},
author = {Moiseev, Alexander and Bolotnikov, A. and DeGeronimo, G. and Hays, E. and James, R. and Thompson, D. and Vernon, E.},
abstractNote = {Here, we will present a concept for a calorimeter based on a novel approach of 3D position-sensitive virtual Frisch-grid CdZnTe (hereafter CZT) detectors. This calorimeter aims to measure photons with energies from ~100 keV to 20–50 MeV . The expected energy resolution at 662 keV is better than 1% FWHM, and the photon interaction position-measurement accuracy is better than 1 mm in all 3 dimensions. Each CZT bar is a rectangular prism with typical cross-section from 5×5 to 7×7 mm2 and length of 2–4 cm. The bars are arranged in modules of 4×4 bars, and the modules themselves can be assembled into a larger array. The 3D virtual voxel approach solves a long-standing problem with CZT detectors associated with material imperfections that limit the performance and usefulness of relatively thick detectors (i.e., >1 cm). Also, it allows us to use the standard (unselected) grade crystals, while achieving the energy resolution of the premium detectors and thus substantially reducing the cost of the instrument. Such a calorimeter can be successfully used in space telescopes that use Compton scattering of γ-rays, such as AMEGO, serving as part of its calorimeter and providing the position and energy measurement for Compton-scattered photons (like a focal plane detector in a Compton camera). Also, it could provide suitable energy resolution to allow for spectroscopic measurements of γ-ray lines from nuclear decays.},
doi = {10.1088/1748-0221/12/12/c12037},
journal = {Journal of Instrumentation},
number = 12,
volume = 12,
place = {United States},
year = {2017},
month = {12}
}