Response of CR-39 nuclear track detectors to protons with non-normal incidence

Przybocki, R.; Johnson, M. Gatu; Sutcliffe, G.; Lahmann, B.; Seguin, F. H.; Frenje, J.; Adrian, P.; Johnson, T. M.; Pearcy, J.; Kabadi, N. V.; Birkel, A.; Petrasso, R. D.

doi:10.1063/5.0029230

Response of CR-39 nuclear track detectors to protons with non-normal incidence

Journal Article · Thu Jan 07 23:00:00 EST 2021 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0029230· OSTI ID:1850395

^[1]; ^[2]; Sutcliffe, G. ^[2]; Lahmann, B. ^[2]; Seguin, F. H. ^[2]; ^[2]; ^[2]; ^[2]; Pearcy, J. ^[2]; ^[2]; ^[2]; ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

This paper presents data from experiments with protons at non-normal incidence to CR-39 nuclear track detectors, analyzing the properties of detection efficiency, proton track diameter, track contrast, and track eccentricity. Understanding the CR-39 response to protons incident at an angle is important for designing charged particle detectors for inertial confinement fusion (ICF) applications. This study considers protons with incident energies less than 3 MeV. In this regime, an incident angle of 10° has no effect on CR-39 detection efficiency, and >85% detection efficiency is preserved up through 25° in the range of 1.0 MeV–2.1 MeV. For ICF applications, incident angles above 30° are deemed impractical for detector design due to significant drops in proton detection at all energies. We observe significant reductions in detection efficiency compared to theoretical predictions, particularly at low energies where proton tracks are etched away. The proton track diameter measured by the scan system is observed to decrease with higher incident angles. The track diameters are analyzed with two fitting models, and it is shown that the diameter–energy relation can be fit with the existing models at angles up to 30° . The optical contrast of the tracks tends to increase with the angle, meaning that the tracks are fainter, and a larger increase is observed for higher energies. Eccentricity, a measure of how elongated proton tracks are, increases with the incident angle and drops after the critical angle. The lowest energy tracks remain nearly circular even at higher angles.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003868

OSTI ID:: 1850395

Alternate ID(s):: OSTI ID: 1756210

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 1 Vol. 92; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Response of CR-39 nuclear track detectors to protons with non-normal incidence R. Przybocki, M. Gatu Johnson Harvard Dataverse https://doi.org/10.7910/dvn/9pfegz	dataset	January 2021

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