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Title: Study of saturation of CR39 nuclear track detectors at high ion fluence and of associated artifact patterns

Abstract

The occurrence of saturation in CR39 solid state nuclear track detectors has been systematically studied as a function of the incident ion ({alpha} particles and laser-accelerated protons) fluence and the etching time. When overexposed (i.e., for fluences above {approx}10{sup 8} particles/cm{sup 2}) and/or overetched, the CR39 detectors enter a saturated regime where direct track counting is not possible anymore. In this regime, optical measurements of saturated CR39 detectors become unreliable as well, since the optical response of the saturated detectors with respect to the ion fluence is highly nonlinear. This nonlinear optical response is likely due to scattering from the surface of irregular clumping patterns which have a diameter {approx}20 {mu}m, i.e., ten times larger than the diameter of individual tracks. These patterns, which aggregate many individual tracks, are observed to develop in highly saturated regimes. For fluences typical of high energy short pulse laser experiments, saturation occurs, inducing the appearance of artifact ringlike structures. By careful microscopic analysis, these artifact ring patterns can be distinguished from the genuine rings occurring below saturation and characteristic of low energy laser accelerated proton beams.

Authors:
; ; ;  [1];  [2];  [3]
  1. Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557 (United States)
  2. (France)
  3. (United States)
Publication Date:
OSTI Identifier:
20953234
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 78; Journal Issue: 1; Other Information: DOI: 10.1063/1.2400020; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ALPHA PARTICLES; DIELECTRIC TRACK DETECTORS; ETCHING; IONS; LASERS; NONLINEAR PROBLEMS; PARTICLE TRACKS; PROTON BEAMS; PROTONS

Citation Formats

Gaillard, S., Fuchs, J., Renard-Le Galloudec, N., Cowan, T. E., Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557 and Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605, CNRS-CEA-Ecole Polytechnique-Universite Paris VI, 91128 Palaiseau Cedex, and Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557. Study of saturation of CR39 nuclear track detectors at high ion fluence and of associated artifact patterns. United States: N. p., 2007. Web. doi:10.1063/1.2400020.
Gaillard, S., Fuchs, J., Renard-Le Galloudec, N., Cowan, T. E., Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557 and Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605, CNRS-CEA-Ecole Polytechnique-Universite Paris VI, 91128 Palaiseau Cedex, & Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557. Study of saturation of CR39 nuclear track detectors at high ion fluence and of associated artifact patterns. United States. doi:10.1063/1.2400020.
Gaillard, S., Fuchs, J., Renard-Le Galloudec, N., Cowan, T. E., Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557 and Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605, CNRS-CEA-Ecole Polytechnique-Universite Paris VI, 91128 Palaiseau Cedex, and Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557. Mon . "Study of saturation of CR39 nuclear track detectors at high ion fluence and of associated artifact patterns". United States. doi:10.1063/1.2400020.
@article{osti_20953234,
title = {Study of saturation of CR39 nuclear track detectors at high ion fluence and of associated artifact patterns},
author = {Gaillard, S. and Fuchs, J. and Renard-Le Galloudec, N. and Cowan, T. E. and Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557 and Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605, CNRS-CEA-Ecole Polytechnique-Universite Paris VI, 91128 Palaiseau Cedex and Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557},
abstractNote = {The occurrence of saturation in CR39 solid state nuclear track detectors has been systematically studied as a function of the incident ion ({alpha} particles and laser-accelerated protons) fluence and the etching time. When overexposed (i.e., for fluences above {approx}10{sup 8} particles/cm{sup 2}) and/or overetched, the CR39 detectors enter a saturated regime where direct track counting is not possible anymore. In this regime, optical measurements of saturated CR39 detectors become unreliable as well, since the optical response of the saturated detectors with respect to the ion fluence is highly nonlinear. This nonlinear optical response is likely due to scattering from the surface of irregular clumping patterns which have a diameter {approx}20 {mu}m, i.e., ten times larger than the diameter of individual tracks. These patterns, which aggregate many individual tracks, are observed to develop in highly saturated regimes. For fluences typical of high energy short pulse laser experiments, saturation occurs, inducing the appearance of artifact ringlike structures. By careful microscopic analysis, these artifact ring patterns can be distinguished from the genuine rings occurring below saturation and characteristic of low energy laser accelerated proton beams.},
doi = {10.1063/1.2400020},
journal = {Review of Scientific Instruments},
number = 1,
volume = 78,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}