Lowenergy highbrightness electron beam dynamics based on slice beam matrix method
Abstract
Preserving the phase space quality has been of crucial importance to highbrightness electron beam transport. Any driving source of beam performance limitations in such a transport system must be carefully examined in order to preserve the beam phase space quality. It is found that in the low beam energy, high bunch charge regime, space charge effect on the charged particle beam evolution can be complicated. It may be insufficient to analyze the beam properties through the envelope or lower order moments for the mere bulk of the beam. In this work we will study the spacechargedominated, lowenergy, highbrightness electron beam dynamics based on the slice beam matrix method. The slice beam matrix method, extended from the existing bulk beam analysis, is applicable to an arbitrary longitudinal bunch distribution and can thus take the nonlinear RF curvature into account. The semianalytical sliced beam space charge model is constructed and assumes an axisymmetric beam in the presence of perfect conducting cylindrical pipe with circular cross section. We present in this paper the theoretical formulation, starting from singleparticle dynamics, space charge field calculation, followed by the moment description of a collection of particles, based on beam sigma matrix and longitudinal slice decomposition. Wemore »
 Authors:

 Huazhong Univ. of Science and Technology, Wuhan (China); SLAC National Accelerator Lab., Menlo Park, CA (United States)
 Huazhong Univ. of Science and Technology, Wuhan (China)
 SLAC National Accelerator Lab., Menlo Park, CA (United States)
 SLAC National Accelerator Lab., Menlo Park, CA (United States); Institute of High Energy Physics, Chinese Academy of Sciences, and Univ. of Chinese Academy of Sciences, Beijing (China)
 Stony Brook Univ., Stony Brook, NY (United States)
 Publication Date:
 Research Org.:
 SLAC National Accelerator Lab., Menlo Park, CA (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1532408
 Alternate Identifier(s):
 OSTI ID: 1547222
 Grant/Contract Number:
 5003131049; AC0276SF00515; FWP2013SLAC100164
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
 Additional Journal Information:
 Journal Volume: 937; Journal Issue: C; Journal ID: ISSN 01689002
 Publisher:
 Elsevier
 Country of Publication:
 United States
 Language:
 English
 Subject:
 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Highbrightness electron beam; Space charge dynamics; Beam matrix method; Slice analysis; Semianalytical calculation
Citation Formats
Tsai, Cheng Ying, Fan, Kuanjun, Feng, Guangyao, Wu, Juhao, Zhou, Guanqun, and Wu, Yuan Hui. Lowenergy highbrightness electron beam dynamics based on slice beam matrix method. United States: N. p., 2019.
Web. doi:10.1016/j.nima.2019.05.035.
Tsai, Cheng Ying, Fan, Kuanjun, Feng, Guangyao, Wu, Juhao, Zhou, Guanqun, & Wu, Yuan Hui. Lowenergy highbrightness electron beam dynamics based on slice beam matrix method. United States. doi:10.1016/j.nima.2019.05.035.
Tsai, Cheng Ying, Fan, Kuanjun, Feng, Guangyao, Wu, Juhao, Zhou, Guanqun, and Wu, Yuan Hui. Tue .
"Lowenergy highbrightness electron beam dynamics based on slice beam matrix method". United States. doi:10.1016/j.nima.2019.05.035. https://www.osti.gov/servlets/purl/1532408.
@article{osti_1532408,
title = {Lowenergy highbrightness electron beam dynamics based on slice beam matrix method},
author = {Tsai, Cheng Ying and Fan, Kuanjun and Feng, Guangyao and Wu, Juhao and Zhou, Guanqun and Wu, Yuan Hui},
abstractNote = {Preserving the phase space quality has been of crucial importance to highbrightness electron beam transport. Any driving source of beam performance limitations in such a transport system must be carefully examined in order to preserve the beam phase space quality. It is found that in the low beam energy, high bunch charge regime, space charge effect on the charged particle beam evolution can be complicated. It may be insufficient to analyze the beam properties through the envelope or lower order moments for the mere bulk of the beam. In this work we will study the spacechargedominated, lowenergy, highbrightness electron beam dynamics based on the slice beam matrix method. The slice beam matrix method, extended from the existing bulk beam analysis, is applicable to an arbitrary longitudinal bunch distribution and can thus take the nonlinear RF curvature into account. The semianalytical sliced beam space charge model is constructed and assumes an axisymmetric beam in the presence of perfect conducting cylindrical pipe with circular cross section. We present in this paper the theoretical formulation, starting from singleparticle dynamics, space charge field calculation, followed by the moment description of a collection of particles, based on beam sigma matrix and longitudinal slice decomposition. We prove the equivalence between the beam matrix method and the envelope formalism in the presence of space charge effect, in both the transverse and longitudinal dimensions. Two examples are then demonstrated, one for a unit cell of superconducting radiofrequency (RF) cavity and the other for a 1.5cell RF gun system. The semianalytical results from beam matrix calculation are discussed and compared with particle tracking simulation using ASTRA. In conclusion, we expect that the analysis based on the slice beam matrix method shall serve as an efficient and advanced tool to further investigate the lowenergy highbrightness electron beam dynamics.},
doi = {10.1016/j.nima.2019.05.035},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 937,
place = {United States},
year = {2019},
month = {5}
}