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Title: Analysis of the microbunching instability in a mid-energy electron linac

Abstract

Microbunching instability usually exists in the linear accelerator (linac) of a free electron laser (FEL) facility. If it is not controlled effectively, the beam quality will be damaged seriously and the machine will not operate properly. In the electron linac of a soft X-ray FEL device, because the electron energy is not very high, the problem can become even more serious. As a typical example, the microbunching instability in the linac of the proposed Shanghai Soft X-ray Free Electron Laser facility (SXFEL) is investigated in detail by means of both analytical formulae and simulation tools. In the study, a new mechanism introducing random noise into the beam current profile as the beam passes through a chicane-type bunch compressor is proposed. The higher-order modes that appear in the simulations suggest that further improvement of the current theoretical model of the instability is needed.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1402846
Report Number(s):
arXiv:1406.6427; FERMILAB-PUB-14-600-APC
Journal ID: ISSN 1674-1137; 1303138
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Chinese Physics. C, High Energy Physics and Nuclear Physics; Journal Volume: 39; Journal Issue: 3
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Huang, Da-Zhang, Gu, Qiang, Wang, Zhen, Zhang, Meng, and Ng, King Yuen. Analysis of the microbunching instability in a mid-energy electron linac. United States: N. p., 2015. Web. doi:10.1088/1674-1137/39/3/038101.
Huang, Da-Zhang, Gu, Qiang, Wang, Zhen, Zhang, Meng, & Ng, King Yuen. Analysis of the microbunching instability in a mid-energy electron linac. United States. doi:10.1088/1674-1137/39/3/038101.
Huang, Da-Zhang, Gu, Qiang, Wang, Zhen, Zhang, Meng, and Ng, King Yuen. Sun . "Analysis of the microbunching instability in a mid-energy electron linac". United States. doi:10.1088/1674-1137/39/3/038101. https://www.osti.gov/servlets/purl/1402846.
@article{osti_1402846,
title = {Analysis of the microbunching instability in a mid-energy electron linac},
author = {Huang, Da-Zhang and Gu, Qiang and Wang, Zhen and Zhang, Meng and Ng, King Yuen},
abstractNote = {Microbunching instability usually exists in the linear accelerator (linac) of a free electron laser (FEL) facility. If it is not controlled effectively, the beam quality will be damaged seriously and the machine will not operate properly. In the electron linac of a soft X-ray FEL device, because the electron energy is not very high, the problem can become even more serious. As a typical example, the microbunching instability in the linac of the proposed Shanghai Soft X-ray Free Electron Laser facility (SXFEL) is investigated in detail by means of both analytical formulae and simulation tools. In the study, a new mechanism introducing random noise into the beam current profile as the beam passes through a chicane-type bunch compressor is proposed. The higher-order modes that appear in the simulations suggest that further improvement of the current theoretical model of the instability is needed.},
doi = {10.1088/1674-1137/39/3/038101},
journal = {Chinese Physics. C, High Energy Physics and Nuclear Physics},
number = 3,
volume = 39,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}