A compact and portable gamma-ray spectrometer (GRASP) for inertial confinement fusion and basic science experiments
Name
083514_1_5.0219539.pdf
Description
Published version
Size
5.23 MB
Format
Adobe PDF
Checksum (MD5)
c416c1efcf058430cce5ac624edf9e46
Author(s)
Dannhoff, SG
Wink, CW
Mackie, S
Berg, GPA
Frenje, JA
Date Issued
August 5, 2024
Journal
Review of Scientific Instruments
Publisher
AIP Publishing
Citation
S. G. Dannhoff, C. W. Wink, S. Mackie, G. P. A. Berg, J. A. Frenje; A compact and portable gamma-ray spectrometer (GRASP) for inertial confinement fusion and basic science experiments. Rev. Sci. Instrum. 1 August 2024; 95 (8): 083514.
Version
Final published version
Abstract
A compact and portable gamma-ray spectrometer has been designed to diagnose different components of the inertial confinement fusionrelevant γ-ray spectrum with energies between ∼3.7–17.9 MeV. The system is designed to be as compact as possible for convenient transportation and fielding in diagnostic ports on the OMEGA laser, the National Ignition Facility, and other photon-source facilities. The system consists of a conversion foil for Compton scattering in front of four magnetic spectrometer “arms,” each covering a different energy range and constructed out of cylindrical permanent magnet Halbach arrays. Monte Carlo simulations have been used to optimize and assess the performance of the conversion foil, and COSY INFINITY ion-optical simulations have been used to optimize the spectrometer magnets. The performance of the design is assessed for a simulated direct-drive γ-ray spectrum. Spanning its total γ-ray energy bandwidth and using a 1.7 mm thick boron conversion foil, the system’s total energy resolution and efficiency are ∼15.8%–4.5% and 5.4 × 10−7 –3.7 × 10−7 e − /γ, respectively, with room for improvement. Spectral γ-ray measurements will provide guidance to the inertial confinement fusion program toward achieving high-energy gain relevant to inertial fusion energy and enable new measurement capabilities for basic discovery science.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1063/5.0219539
