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Title: Dispersion calibration for the National Ignition Facility electron–positron–proton spectrometers for intense laser matter interactions

Abstract

Electron–positron pairs, produced in intense laser–solid interactions, are diagnosed using magnetic spectrometers with image plates, such as the National Ignition Facility Electron–Positron–Proton Spectrometers (EPPSs). Although modeling can help infer the quantitative value, the accuracy of the models needs to be verified to ensure measurement quality. The dispersion of low-energy electrons and positrons may be affected by fringe magnetic fields near the entrance of the EPPS. We have calibrated the EPPS with six electron beams from a Siemens Oncor linear accelerator (linac) ranging in energy from 2.7 MeV to 15.2 MeV as they enter the spectrometer. A Geant4 Tool for Particle Simulation Monte Carlo simulation was set up to match depth dose curves and lateral profiles measured in water at 100 cm source–surface distance. An accurate relationship was established between the bending magnet current setting and the energy of the electron beam at the exit window. The simulations and measurements were used to determine the energy distributions of the six electron beams at the EPPS slit. Furthermore, analysis of the scanned image plates together with the determined energy distribution arriving in the spectrometer provides improved dispersion curves for the EPPS.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [4]; ORCiD logo [6]; ORCiD logo [5]; ORCiD logo [5]
+ Show Author Affiliations
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Max Planck Society, Garching (Germany). Max Planck Institute for Plasma Physics
  2. Univ. of California, San Francisco, CA (United States)
  3. Columbia Univ., New York, NY (United States)
  4. Univ. of Michigan, Ann Arbor, MI (United States). Center for Ultrafast Optical Science
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1806410
Alternate Identifier(s):
OSTI ID: 1769447
Report Number(s):
LLNL-JRNL-817275
Journal ID: ISSN 0034-6748; 1027215; TRN: US2213123
Grant/Contract Number:  
AC52-07NA27344; 20-LW-021
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 92; Journal Issue: 3; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; particle beams; Monte Carlo methods; particle accelerators; calibration methods; pair production; lasers; electron positron interactions; linear accelerators

Citation Formats

von der Linden, Jens, Ramos-Méndez, José, Faddegon, Bruce, Massin, Devan, Fiksel, Gennady, Holder, Joe P., Willingale, Louise, Peebles, Jonathan, Edwards, Matthew R., and Chen, Hui. Dispersion calibration for the National Ignition Facility electron–positron–proton spectrometers for intense laser matter interactions. United States: N. p., 2021. Web. doi:10.1063/5.0040624.
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von der Linden, Jens, Ramos-Méndez, José, Faddegon, Bruce, Massin, Devan, Fiksel, Gennady, Holder, Joe P., Willingale, Louise, Peebles, Jonathan, Edwards, Matthew R., & Chen, Hui. Dispersion calibration for the National Ignition Facility electron–positron–proton spectrometers for intense laser matter interactions. United States. https://doi.org/10.1063/5.0040624
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von der Linden, Jens, Ramos-Méndez, José, Faddegon, Bruce, Massin, Devan, Fiksel, Gennady, Holder, Joe P., Willingale, Louise, Peebles, Jonathan, Edwards, Matthew R., and Chen, Hui. Fri . "Dispersion calibration for the National Ignition Facility electron–positron–proton spectrometers for intense laser matter interactions". United States. https://doi.org/10.1063/5.0040624. https://www.osti.gov/servlets/purl/1806410.
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@article{osti_1806410,
title = {Dispersion calibration for the National Ignition Facility electron–positron–proton spectrometers for intense laser matter interactions},
author = {von der Linden, Jens and Ramos-Méndez, José and Faddegon, Bruce and Massin, Devan and Fiksel, Gennady and Holder, Joe P. and Willingale, Louise and Peebles, Jonathan and Edwards, Matthew R. and Chen, Hui},
abstractNote = {Electron–positron pairs, produced in intense laser–solid interactions, are diagnosed using magnetic spectrometers with image plates, such as the National Ignition Facility Electron–Positron–Proton Spectrometers (EPPSs). Although modeling can help infer the quantitative value, the accuracy of the models needs to be verified to ensure measurement quality. The dispersion of low-energy electrons and positrons may be affected by fringe magnetic fields near the entrance of the EPPS. We have calibrated the EPPS with six electron beams from a Siemens Oncor linear accelerator (linac) ranging in energy from 2.7 MeV to 15.2 MeV as they enter the spectrometer. A Geant4 Tool for Particle Simulation Monte Carlo simulation was set up to match depth dose curves and lateral profiles measured in water at 100 cm source–surface distance. An accurate relationship was established between the bending magnet current setting and the energy of the electron beam at the exit window. The simulations and measurements were used to determine the energy distributions of the six electron beams at the EPPS slit. Furthermore, analysis of the scanned image plates together with the determined energy distribution arriving in the spectrometer provides improved dispersion curves for the EPPS.},
doi = {10.1063/5.0040624},
journal = {Review of Scientific Instruments},
number = 3,
volume = 92,
place = {United States},
year = {Fri Mar 05 00:00:00 EST 2021},
month = {Fri Mar 05 00:00:00 EST 2021}
}
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https://doi.org/10.1063/5.0040624
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