Effect of Multiple Scattering on the Compton Recoil Current Generated in an EMP, Revisited
Abstract
Multiple scattering has historically been treated in EMP modeling through the obliquity factor. The validity of this approach is examined here. A simplified model problem, which correctly captures cyclotron motion, Doppler shifting due to the electron motion, and multiple scattering is first considered. The simplified problem is solved three ways: the obliquity factor, Monte-Carlo, and Fokker-Planck finite-difference. Because of the Doppler effect, skewness occurs in the distribution. It is demonstrated that the obliquity factor does not correctly capture this skewness, but the Monte-Carlo and Fokker-Planck finite-difference approaches do. Here, the obliquity factor and Fokker-Planck finite-difference approaches are then compared in a fuller treatment, which includes the initial Klein-Nishina distribution of the electrons, and the momentum dependence of both drag and scattering. It is found that, in general, the obliquity factor is adequate for most situations. However, as the gamma energy increases and the Klein-Nishina becomes more peaked in the forward direction, skewness in the distribution causes greater disagreement between the obliquity factor and a more accurate model of multiple scattering.
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1234629
- Report Number(s):
- LLNL-JRNL-668928
Journal ID: ISSN 0018-9499
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- IEEE Transactions on Nuclear Science
- Additional Journal Information:
- Journal Volume: 62; Journal Issue: 4; Journal ID: ISSN 0018-9499
- Publisher:
- IEEE
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS; 45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
Citation Formats
Farmer, William A., and Friedman, Alex. Effect of Multiple Scattering on the Compton Recoil Current Generated in an EMP, Revisited. United States: N. p., 2015.
Web. doi:10.1109/TNS.2015.2431683.
Farmer, William A., & Friedman, Alex. Effect of Multiple Scattering on the Compton Recoil Current Generated in an EMP, Revisited. United States. https://doi.org/10.1109/TNS.2015.2431683
Farmer, William A., and Friedman, Alex. Thu .
"Effect of Multiple Scattering on the Compton Recoil Current Generated in an EMP, Revisited". United States. https://doi.org/10.1109/TNS.2015.2431683. https://www.osti.gov/servlets/purl/1234629.
@article{osti_1234629,
title = {Effect of Multiple Scattering on the Compton Recoil Current Generated in an EMP, Revisited},
author = {Farmer, William A. and Friedman, Alex},
abstractNote = {Multiple scattering has historically been treated in EMP modeling through the obliquity factor. The validity of this approach is examined here. A simplified model problem, which correctly captures cyclotron motion, Doppler shifting due to the electron motion, and multiple scattering is first considered. The simplified problem is solved three ways: the obliquity factor, Monte-Carlo, and Fokker-Planck finite-difference. Because of the Doppler effect, skewness occurs in the distribution. It is demonstrated that the obliquity factor does not correctly capture this skewness, but the Monte-Carlo and Fokker-Planck finite-difference approaches do. Here, the obliquity factor and Fokker-Planck finite-difference approaches are then compared in a fuller treatment, which includes the initial Klein-Nishina distribution of the electrons, and the momentum dependence of both drag and scattering. It is found that, in general, the obliquity factor is adequate for most situations. However, as the gamma energy increases and the Klein-Nishina becomes more peaked in the forward direction, skewness in the distribution causes greater disagreement between the obliquity factor and a more accurate model of multiple scattering.},
doi = {10.1109/TNS.2015.2431683},
journal = {IEEE Transactions on Nuclear Science},
number = 4,
volume = 62,
place = {United States},
year = {Thu Jun 18 00:00:00 EDT 2015},
month = {Thu Jun 18 00:00:00 EDT 2015}
}
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