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Title: Investigation of Microwave Instability on Electron Storage Ring TLS

Abstract

With the planned installation of a superconducting rf system, the new operation mode of TLS, the electron storage ring at NSRRC, is expected to double the beam intensity. Several accelerator physics topics need to be examined. Beam instability of single-bunch longitudinal microwave instability is one of these topics. We consider two approaches to measure the effective broad band impedance. We compare these measurement results with each other and to old data [Ref.1]. We calculate the threshold current of microwave instability with a mode-mixing analysis code written by Dr. K. Oide of KEK [Ref.2]. We also develop a multi-particle tracking code to simulate the instability. The results of simulation and measurement are compared and discussed. We conclude that doubling of beam current from 200 mA (1.5 mA/bunch) to 400 mA (3 mA/bunch) will not trigger the microwave instability even without a Landau cavity to lengthen the bunch. The benefit of Landau cavity is mainly for beam life time.

Authors:
;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
890852
Report Number(s):
SLAC-PUB-11223
TRN: US0604846
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Presented at the 9th European Particle Accelerator Conference (EPAC 2004), Lucerne, Switzerland, 5-9 Jul 2004
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; BEAM CURRENTS; ELECTRONS; IMPEDANCE; INSTABILITY; PHYSICS; RF SYSTEMS; SIMULATION; STORAGE RINGS; THRESHOLD CURRENT; Accelerators,ACCPHY, HEPEX

Citation Formats

Wang, M -H, /NSRRC, Taiwan, Chao, A, and /SLAC. Investigation of Microwave Instability on Electron Storage Ring TLS. United States: N. p., 2005. Web.
Wang, M -H, /NSRRC, Taiwan, Chao, A, & /SLAC. Investigation of Microwave Instability on Electron Storage Ring TLS. United States.
Wang, M -H, /NSRRC, Taiwan, Chao, A, and /SLAC. 2005. "Investigation of Microwave Instability on Electron Storage Ring TLS". United States. https://www.osti.gov/servlets/purl/890852.
@article{osti_890852,
title = {Investigation of Microwave Instability on Electron Storage Ring TLS},
author = {Wang, M -H and /NSRRC, Taiwan and Chao, A and /SLAC},
abstractNote = {With the planned installation of a superconducting rf system, the new operation mode of TLS, the electron storage ring at NSRRC, is expected to double the beam intensity. Several accelerator physics topics need to be examined. Beam instability of single-bunch longitudinal microwave instability is one of these topics. We consider two approaches to measure the effective broad band impedance. We compare these measurement results with each other and to old data [Ref.1]. We calculate the threshold current of microwave instability with a mode-mixing analysis code written by Dr. K. Oide of KEK [Ref.2]. We also develop a multi-particle tracking code to simulate the instability. The results of simulation and measurement are compared and discussed. We conclude that doubling of beam current from 200 mA (1.5 mA/bunch) to 400 mA (3 mA/bunch) will not trigger the microwave instability even without a Landau cavity to lengthen the bunch. The benefit of Landau cavity is mainly for beam life time.},
doi = {},
url = {https://www.osti.gov/biblio/890852}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 17 00:00:00 EDT 2005},
month = {Tue May 17 00:00:00 EDT 2005}
}

Conference:
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