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Title: Fast longitudinal beam dynamics optimization in x-ray free electron laser linear accelerators

Abstract

A high peak current, flat longitudinal phase space electron beam is desirable for efficient X-ray free electron laser (FEL) radiation in next generation light sources. To attain such a beam requires the extensive design of the linear accelerator (linac) including both linear and nonlinear effects. In this paper, we propose a lumped longitudinal beam dynamics model for fast optimization of the electron beam longitudinal phase space through the accelerator. This model is much faster than available tracking programs and also shows good agreement with the fully three-dimensional element-by-element multiparticle simulations. We applied this model in a parallel multiobjective differential evolution optimization program to an existing LCLS-II superconducting linac design and obtained an optimal solution with significantly higher core peak current than the original design.

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566937
Alternate Identifier(s):
OSTI ID: 1572062
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 22 Journal Issue: 9; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Qiang, Ji. Fast longitudinal beam dynamics optimization in x-ray free electron laser linear accelerators. United States: N. p., 2019. Web. doi:10.1103/PhysRevAccelBeams.22.094401.
Qiang, Ji. Fast longitudinal beam dynamics optimization in x-ray free electron laser linear accelerators. United States. doi:10.1103/PhysRevAccelBeams.22.094401.
Qiang, Ji. Fri . "Fast longitudinal beam dynamics optimization in x-ray free electron laser linear accelerators". United States. doi:10.1103/PhysRevAccelBeams.22.094401.
@article{osti_1566937,
title = {Fast longitudinal beam dynamics optimization in x-ray free electron laser linear accelerators},
author = {Qiang, Ji},
abstractNote = {A high peak current, flat longitudinal phase space electron beam is desirable for efficient X-ray free electron laser (FEL) radiation in next generation light sources. To attain such a beam requires the extensive design of the linear accelerator (linac) including both linear and nonlinear effects. In this paper, we propose a lumped longitudinal beam dynamics model for fast optimization of the electron beam longitudinal phase space through the accelerator. This model is much faster than available tracking programs and also shows good agreement with the fully three-dimensional element-by-element multiparticle simulations. We applied this model in a parallel multiobjective differential evolution optimization program to an existing LCLS-II superconducting linac design and obtained an optimal solution with significantly higher core peak current than the original design.},
doi = {10.1103/PhysRevAccelBeams.22.094401},
journal = {Physical Review Accelerators and Beams},
number = 9,
volume = 22,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.22.094401

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