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Title: Emittance Growth in the DARHT-II Linear Induction Accelerator

Abstract

The dual-axis radiographic hydrodynamic test (DARHT) facility uses bremsstrahlung radiation source spots produced by the focused electron beams from two linear induction accelerators (LIAs) to radiograph large hydrodynamic experiments driven by high explosives. Radiographic resolution is determined by the size of the source spot, and beam emittance is the ultimate limitation to spot size. On the DARHT-II LIA, we measure an emittance higher than predicted by theoretical simulations, and even though this accelerator produces submillimeter source spots, we are exploring ways to improve the emittance. Some of the possible causes for the discrepancy have been investigated using particle-in-cell codes. Finally, the simulations establish that the most likely source of emittance growth is a mismatch of the beam to the magnetic transport, which can cause beam halo.

Authors:
ORCiD logo; ; ; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1410477
Alternate Identifier(s):
OSTI ID: 1407889; OSTI ID: 1410478
Report Number(s):
LA-UR-17-23447
Journal ID: ISSN 0093-3813; 8057598
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Published Article
Journal Name:
IEEE Transactions on Plasma Science
Additional Journal Information:
Journal Name: IEEE Transactions on Plasma Science Journal Volume: 45 Journal Issue: 11; Journal ID: ISSN 0093-3813
Publisher:
Institute of Electrical and Electronics Engineers
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Beam instabilities; emittance; intense relativistic electron beams; linear induction accelerators (LIAs)

Citation Formats

Ekdahl, Carl, Carlson, Carl A., Frayer, Daniel K., McCuistian, B. Trent, Mostrom, Christopher B., Schulze, Martin E., and Thoma, Carsten H. Emittance Growth in the DARHT-II Linear Induction Accelerator. United States: N. p., 2017. Web. doi:10.1109/TPS.2017.2755861.
Ekdahl, Carl, Carlson, Carl A., Frayer, Daniel K., McCuistian, B. Trent, Mostrom, Christopher B., Schulze, Martin E., & Thoma, Carsten H. Emittance Growth in the DARHT-II Linear Induction Accelerator. United States. doi:10.1109/TPS.2017.2755861.
Ekdahl, Carl, Carlson, Carl A., Frayer, Daniel K., McCuistian, B. Trent, Mostrom, Christopher B., Schulze, Martin E., and Thoma, Carsten H. Wed . "Emittance Growth in the DARHT-II Linear Induction Accelerator". United States. doi:10.1109/TPS.2017.2755861.
@article{osti_1410477,
title = {Emittance Growth in the DARHT-II Linear Induction Accelerator},
author = {Ekdahl, Carl and Carlson, Carl A. and Frayer, Daniel K. and McCuistian, B. Trent and Mostrom, Christopher B. and Schulze, Martin E. and Thoma, Carsten H.},
abstractNote = {The dual-axis radiographic hydrodynamic test (DARHT) facility uses bremsstrahlung radiation source spots produced by the focused electron beams from two linear induction accelerators (LIAs) to radiograph large hydrodynamic experiments driven by high explosives. Radiographic resolution is determined by the size of the source spot, and beam emittance is the ultimate limitation to spot size. On the DARHT-II LIA, we measure an emittance higher than predicted by theoretical simulations, and even though this accelerator produces submillimeter source spots, we are exploring ways to improve the emittance. Some of the possible causes for the discrepancy have been investigated using particle-in-cell codes. Finally, the simulations establish that the most likely source of emittance growth is a mismatch of the beam to the magnetic transport, which can cause beam halo.},
doi = {10.1109/TPS.2017.2755861},
journal = {IEEE Transactions on Plasma Science},
number = 11,
volume = 45,
place = {United States},
year = {2017},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1109/TPS.2017.2755861

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