Quantifying the effects of neutron fluence on proton signal retention in CR-39
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103505_1_5.0219479.pdf
Description
Published version
Size
7.19 MB
Format
Adobe PDF
Checksum (MD5)
3911739c1c93cfac8e0f07a62973a7dd
Author(s)
Russell, L
Johnson, TM
Lawrence, Y
Reichelt, B
Vanderloo, N
Cufari, M
Buschmann, BI
Dannhoff, S
DeVault, A
Doeg, E
Date Issued
October 2, 2024
Journal
Review of Scientific Instruments
Publisher
AIP Publishing
Citation
L. Russell, T. M. Johnson, Y. Lawrence, B. Reichelt, N. Vanderloo, M. Cufari, B. I. Buschmann, S. Dannhoff, A. DeVault, E. Doeg, T. Evans, B. C. Foo, R. Frankel, J. H. Kunimune, J. A. Pearcy, J. Vargas, M. Gatu Johnson, J. Frenje; Quantifying the effects of neutron fluence on proton signal retention in CR-39. Rev. Sci. Instrum. 1 October 2024; 95 (10): 103505.
Version
Final published version
Abstract
This paper reports on investigations on the impact of higher neutron fluences on the detection efficiency of protons with CR-39, a charged particle track detector. CR-39 is widely used as a diagnostic for inertial fusion applications and is an integral component of numerous particle diagnostics at the OMEGA laser facility and National Ignition Facility. As experiments continue to produce higher and higher yields, existing diagnostics are impacted by higher particle fluences than they were originally designed for. This paper presents data from experiments measuring proton signal on pieces of CR-39 with different levels of neutron fluence with two different etch times. The experiments show a decrease in signal recovery with increased neutron fluence, which is exacerbated at longer etch times. At 3 h etch time, data suggest a 17% ± 7% signal loss at 1.3 × 105 neutron-induced tracks per cm2 and a 67% ± 21% loss at 6 h etch time. Careful signal isolation techniques can recover most of the proton tracks even with moderate neutron fluence.
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Creative Commons Attribution-Noncommercial
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DOI of Published Version
https://doi.org/10.1063/5.0219479
