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

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 [1] ;  [2] ;  [2] ;  [1] ;  [3] ;  [1] ;  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. National Security Technologies, Los Alamos, NM (United States)
  3. Voss Scientific, Albuquerque, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-23447
Journal ID: ISSN 0093-3813; TRN: US1703058
Grant/Contract Number:
AC52-06NA25396
Type:
Published Article
Journal Name:
IEEE Transactions on Plasma Science
Additional Journal Information:
Journal Volume: 45; Journal Issue: 11; Journal ID: ISSN 0093-3813
Publisher:
IEEE
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Beam instabilities; emittance; intense relativistic electron beams; linear induction accelerators (LIAs)
OSTI Identifier:
1410477
Alternate Identifier(s):
OSTI ID: 1407889; OSTI ID: 1410478

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., 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.. 2017. "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 = {10}
}