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Title: Entrance and Exit CSR Impedance for Non-Ultrarelativistic Beam

Abstract

For a high-brightness electron beam being transported through beamlines involving bending systems, the coherent synchrotron radiation (CSR) and longitudinal space charge (LSC) interaction could often cause microbunching instability. The semi-analytical Vlasov solver for microbunching gain* depends on the impedances for the relevant collective effects. The existing results for CSR impedances are usually obtained for the ultrarelativistic limit. To extend the microbunching analysis to cases of low energies, such as the case of an ERL merger, or to density modulations at extremely small wavelength, it is necessary to extend the impedance analysis to the non-ultrarelativistic regime. In this study, we present the impedance analysis for the transient CSR interaction in the non-ultrarelativistic regime, for transients including both entrance to and exit from a magnetic dipole. These impedance results will be compared to their ultra-relativistic counterparts**, and the corresponding wakefield obtained from the impedance for low-energy beams will be compared with the existing results of transient CSR wakefield for general beam energies***.

Authors:
;  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1375795
Report Number(s):
JLAB-ACP-17-2513; DOE/OR/23177-4183
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: IPAC 2017, Copenhagen, Denmark, May 14-19, 2017
Country of Publication:
United States
Language:
English

Citation Formats

Li, Rui, and Tsai, Cheng Ying. Entrance and Exit CSR Impedance for Non-Ultrarelativistic Beam. United States: N. p., 2017. Web. doi:10.18429/JACoW-IPAC2017-WEPIK113.
Li, Rui, & Tsai, Cheng Ying. Entrance and Exit CSR Impedance for Non-Ultrarelativistic Beam. United States. doi:10.18429/JACoW-IPAC2017-WEPIK113.
Li, Rui, and Tsai, Cheng Ying. 2017. "Entrance and Exit CSR Impedance for Non-Ultrarelativistic Beam". United States. doi:10.18429/JACoW-IPAC2017-WEPIK113. https://www.osti.gov/servlets/purl/1375795.
@article{osti_1375795,
title = {Entrance and Exit CSR Impedance for Non-Ultrarelativistic Beam},
author = {Li, Rui and Tsai, Cheng Ying},
abstractNote = {For a high-brightness electron beam being transported through beamlines involving bending systems, the coherent synchrotron radiation (CSR) and longitudinal space charge (LSC) interaction could often cause microbunching instability. The semi-analytical Vlasov solver for microbunching gain* depends on the impedances for the relevant collective effects. The existing results for CSR impedances are usually obtained for the ultrarelativistic limit. To extend the microbunching analysis to cases of low energies, such as the case of an ERL merger, or to density modulations at extremely small wavelength, it is necessary to extend the impedance analysis to the non-ultrarelativistic regime. In this study, we present the impedance analysis for the transient CSR interaction in the non-ultrarelativistic regime, for transients including both entrance to and exit from a magnetic dipole. These impedance results will be compared to their ultra-relativistic counterparts**, and the corresponding wakefield obtained from the impedance for low-energy beams will be compared with the existing results of transient CSR wakefield for general beam energies***.},
doi = {10.18429/JACoW-IPAC2017-WEPIK113},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 5
}

Conference:
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