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Title: Impact of x-ray dose on track formation and data analysis for CR-39-based proton diagnostics

The nuclear track detector CR-39 is used extensively for charged particle diagnosis, in particular proton spectroscopy, at inertial confinement fusion facilities. These detectors can absorb x-ray doses from the experiments in the order of 1–100 Gy, the effects of which are not accounted for in the previous detector calibrations. X-ray dose absorbed in the CR-39 has previously been shown to affect the track size of alpha particles in the detector, primarily due to a measured reduction in the material bulk etch rate [Rojas-Herrera et al., Rev. Sci. Instrum. 86, 033501 (2015)]. Similar to the previous findings for alpha particles, protons with energies in the range 0.5–9.1 MeV are shown to produce tracks that are systematically smaller as a function of the absorbed x-ray dose in the CR-39. The reduction of track size due to x-ray dose is found to diminish with time between exposure and etching if the CR-39 is stored at ambient temperature, and complete recovery is observed after two weeks. Furthermore, the impact of this effect on the analysis of data from existing CR-39-based proton diagnostics on OMEGA and the National Ignition Facility is evaluated and best practices are proposed for cases in which the effect of xmore » rays is significant.« less
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3] ; ORCiD logo [2] ;  [2] ; ORCiD logo [2] ;  [2] ;  [4] ;  [2] ;  [2] ; ORCiD logo [2] ;  [5] ;  [6] ;  [5] ;  [5] ;  [5]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Rochester, Rochester, NY (United States)
  5. State Univ. of New York at Geneseo, Geneseo, NY (United States)
  6. Rochester Institute of Technology, Rochester, NY (United States)
Publication Date:
Grant/Contract Number:
NA0002726; NA0001857; NA0002949
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 86; Journal Issue: 12; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; protons; x-ray effects; x-ray spectra; etching; charged particle spectroscopy
OSTI Identifier:
1261134
Alternate Identifier(s):
OSTI ID: 1261136; OSTI ID: 1261138

Rinderknecht, H. G., Rojas-Herrera, J., Zylstra, A. B., Frenje, J. A., Gatu Johnson, M., Sio, H., Sinenian, N., Rosenberg, M. J., Li, C. K., Seguin, F. H., Petrasso, R. D., Filkins, T., Steidle, Jeffrey A., Steidle, Jessica A., Traynor, N., and Freeman, C.. Impact of x-ray dose on track formation and data analysis for CR-39-based proton diagnostics. United States: N. p., Web. doi:10.1063/1.4938161.
Rinderknecht, H. G., Rojas-Herrera, J., Zylstra, A. B., Frenje, J. A., Gatu Johnson, M., Sio, H., Sinenian, N., Rosenberg, M. J., Li, C. K., Seguin, F. H., Petrasso, R. D., Filkins, T., Steidle, Jeffrey A., Steidle, Jessica A., Traynor, N., & Freeman, C.. Impact of x-ray dose on track formation and data analysis for CR-39-based proton diagnostics. United States. doi:10.1063/1.4938161.
Rinderknecht, H. G., Rojas-Herrera, J., Zylstra, A. B., Frenje, J. A., Gatu Johnson, M., Sio, H., Sinenian, N., Rosenberg, M. J., Li, C. K., Seguin, F. H., Petrasso, R. D., Filkins, T., Steidle, Jeffrey A., Steidle, Jessica A., Traynor, N., and Freeman, C.. 2015. "Impact of x-ray dose on track formation and data analysis for CR-39-based proton diagnostics". United States. doi:10.1063/1.4938161. https://www.osti.gov/servlets/purl/1261134.
@article{osti_1261134,
title = {Impact of x-ray dose on track formation and data analysis for CR-39-based proton diagnostics},
author = {Rinderknecht, H. G. and Rojas-Herrera, J. and Zylstra, A. B. and Frenje, J. A. and Gatu Johnson, M. and Sio, H. and Sinenian, N. and Rosenberg, M. J. and Li, C. K. and Seguin, F. H. and Petrasso, R. D. and Filkins, T. and Steidle, Jeffrey A. and Steidle, Jessica A. and Traynor, N. and Freeman, C.},
abstractNote = {The nuclear track detector CR-39 is used extensively for charged particle diagnosis, in particular proton spectroscopy, at inertial confinement fusion facilities. These detectors can absorb x-ray doses from the experiments in the order of 1–100 Gy, the effects of which are not accounted for in the previous detector calibrations. X-ray dose absorbed in the CR-39 has previously been shown to affect the track size of alpha particles in the detector, primarily due to a measured reduction in the material bulk etch rate [Rojas-Herrera et al., Rev. Sci. Instrum. 86, 033501 (2015)]. Similar to the previous findings for alpha particles, protons with energies in the range 0.5–9.1 MeV are shown to produce tracks that are systematically smaller as a function of the absorbed x-ray dose in the CR-39. The reduction of track size due to x-ray dose is found to diminish with time between exposure and etching if the CR-39 is stored at ambient temperature, and complete recovery is observed after two weeks. Furthermore, the impact of this effect on the analysis of data from existing CR-39-based proton diagnostics on OMEGA and the National Ignition Facility is evaluated and best practices are proposed for cases in which the effect of x rays is significant.},
doi = {10.1063/1.4938161},
journal = {Review of Scientific Instruments},
number = 12,
volume = 86,
place = {United States},
year = {2015},
month = {12}
}