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Title: Technique for inferring angle change as a function of time for high-current electron beams using a dose-rate monitor array

Abstract

Intense electron beams striking a high-atomic number target produce high-output pulsed photon fluxes for flash x-ray experiments. Without an external guide field, such beams are subject to the dynamics of high-current electron beam propagation, including changes to electron trajectories either from self-fields or from development of beam instabilities. The bremsstrahlung output (dose-rate) scales approximately as IV x, where I is the beam current, V the electron energy, and x is in the range 2.0–2.65 and depends upon the electron angle on the converter. Using experimental beam data (dose-rate, I and V), this equation can be solved for x, a process known as “inverting the radiographer’s equation.” Inversion methods that rely on thermoluminescent dosimeters, which are time-integrated, yield no information about evolution of the electron beam angle in time. We propose here an inversion method that uses several dose-rate monitors at different angles with respect to the beam axis. By measuring dose-rates at different angles, one can infer the time-dependent beam voltage and angle. Furthermore, this method compares well with estimates of corrected voltage and results in a self-consistent picture of beam dynamics. Techniques are demonstrated using data from self-magnetic pinch experiments at the RITS-6 facility at Sandia National Laboratories.

Authors:
ORCiD logo [1];  [2];  [2];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Naval Research Lab., Washington, D.C. (United States). Plasma Physics Div.
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1575256
Alternate Identifier(s):
OSTI ID: 1574544
Report Number(s):
SAND-2019-5559J
Journal ID: ISSN 0034-6748; 675620
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 90; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Renk, Timothy Jerome, Weber, Bruce V., Rittersdorf, I. M., and Webb, Timothy Jay. Technique for inferring angle change as a function of time for high-current electron beams using a dose-rate monitor array. United States: N. p., 2019. Web. doi:10.1063/1.5110413.
Renk, Timothy Jerome, Weber, Bruce V., Rittersdorf, I. M., & Webb, Timothy Jay. Technique for inferring angle change as a function of time for high-current electron beams using a dose-rate monitor array. United States. doi:10.1063/1.5110413.
Renk, Timothy Jerome, Weber, Bruce V., Rittersdorf, I. M., and Webb, Timothy Jay. Tue . "Technique for inferring angle change as a function of time for high-current electron beams using a dose-rate monitor array". United States. doi:10.1063/1.5110413.
@article{osti_1575256,
title = {Technique for inferring angle change as a function of time for high-current electron beams using a dose-rate monitor array},
author = {Renk, Timothy Jerome and Weber, Bruce V. and Rittersdorf, I. M. and Webb, Timothy Jay},
abstractNote = {Intense electron beams striking a high-atomic number target produce high-output pulsed photon fluxes for flash x-ray experiments. Without an external guide field, such beams are subject to the dynamics of high-current electron beam propagation, including changes to electron trajectories either from self-fields or from development of beam instabilities. The bremsstrahlung output (dose-rate) scales approximately as IVx, where I is the beam current, V the electron energy, and x is in the range 2.0–2.65 and depends upon the electron angle on the converter. Using experimental beam data (dose-rate, I and V), this equation can be solved for x, a process known as “inverting the radiographer’s equation.” Inversion methods that rely on thermoluminescent dosimeters, which are time-integrated, yield no information about evolution of the electron beam angle in time. We propose here an inversion method that uses several dose-rate monitors at different angles with respect to the beam axis. By measuring dose-rates at different angles, one can infer the time-dependent beam voltage and angle. Furthermore, this method compares well with estimates of corrected voltage and results in a self-consistent picture of beam dynamics. Techniques are demonstrated using data from self-magnetic pinch experiments at the RITS-6 facility at Sandia National Laboratories.},
doi = {10.1063/1.5110413},
journal = {Review of Scientific Instruments},
number = 11,
volume = 90,
place = {United States},
year = {2019},
month = {11}
}

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