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Title: Self-Consistant Numerical Modeling of E-Cloud Driven Instability of a Bunch Train in the CERN SPS

Abstract

The simulation package WARP-POSINST was recently upgraded for handling multiple bunches and modeling concurrently the electron cloud buildup and its effect on the beam, allowing for direct self-consistent simulation of bunch trains generating, and interacting with, electron clouds. We have used the WARP-POSINST package on massively parallel supercomputers to study the growth rate and frequency patterns in space-time of the electron cloud driven transverse instability for a proton bunch train in the CERN SPS accelerator. Results suggest that a positive feedback mechanism exists between the electron buildup and the e-cloud driven transverse instability, leading to a net increase in predicted electron density. Comparisons to selected experimental data are also given. Electron clouds have been shown to trigger fast growing instabilities on proton beams circulating in the SPS and other accelerators. So far, simulations of electron cloud buildup and their effects on beam dynamics have been performed separately. This is a consequence of the large computational cost of the combined calculation due to large space and time scale disparities between the two processes. We have presented the latest improvements of the simulation package WARP-POSINST for the simulation of self-consistent ecloud effects, including mesh refinement, and generation of electrons from gas ionizationmore » and impact at the pipe walls. We also presented simulations of two consecutive bunches interacting with electrons clouds in the SPS, which included generation of secondary electrons. The distribution of electrons in front of the first beam was initialized from a dump taken from a preceding buildup calculation using the POSINST code. In this paper, we present an extension of this work where one full batch of 72 bunches is simulated in the SPS, including the entire buildup calculation and the self-consistent interaction between the bunches and the electrons. Comparisons to experimental data are also given.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Accelerator& Fusion Research Division
OSTI Identifier:
1015565
Report Number(s):
LBNL-4510E
TRN: US1102860
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: ECLOUD10, Ithaca, New York, October 8-12, 2010
Country of Publication:
United States
Language:
English
Subject:
43; ACCELERATORS; BEAM DYNAMICS; BUILDUP; CERN; CLOUDS; DISTRIBUTION; ELECTRON DENSITY; ELECTRONS; FEEDBACK; INSTABILITY; IONIZATION; PROTON BEAMS; PROTONS; SIMULATION; SPACE-TIME; SUPERCOMPUTERS

Citation Formats

Vay, J-L., Furman, M.A., Secondo, R., Venturini, M., Fox, J.D., and Rivetta, C.H,. Self-Consistant Numerical Modeling of E-Cloud Driven Instability of a Bunch Train in the CERN SPS. United States: N. p., 2010. Web.
Vay, J-L., Furman, M.A., Secondo, R., Venturini, M., Fox, J.D., & Rivetta, C.H,. Self-Consistant Numerical Modeling of E-Cloud Driven Instability of a Bunch Train in the CERN SPS. United States.
Vay, J-L., Furman, M.A., Secondo, R., Venturini, M., Fox, J.D., and Rivetta, C.H,. Wed . "Self-Consistant Numerical Modeling of E-Cloud Driven Instability of a Bunch Train in the CERN SPS". United States. https://www.osti.gov/servlets/purl/1015565.
@article{osti_1015565,
title = {Self-Consistant Numerical Modeling of E-Cloud Driven Instability of a Bunch Train in the CERN SPS},
author = {Vay, J-L. and Furman, M.A. and Secondo, R. and Venturini, M. and Fox, J.D. and Rivetta, C.H,},
abstractNote = {The simulation package WARP-POSINST was recently upgraded for handling multiple bunches and modeling concurrently the electron cloud buildup and its effect on the beam, allowing for direct self-consistent simulation of bunch trains generating, and interacting with, electron clouds. We have used the WARP-POSINST package on massively parallel supercomputers to study the growth rate and frequency patterns in space-time of the electron cloud driven transverse instability for a proton bunch train in the CERN SPS accelerator. Results suggest that a positive feedback mechanism exists between the electron buildup and the e-cloud driven transverse instability, leading to a net increase in predicted electron density. Comparisons to selected experimental data are also given. Electron clouds have been shown to trigger fast growing instabilities on proton beams circulating in the SPS and other accelerators. So far, simulations of electron cloud buildup and their effects on beam dynamics have been performed separately. This is a consequence of the large computational cost of the combined calculation due to large space and time scale disparities between the two processes. We have presented the latest improvements of the simulation package WARP-POSINST for the simulation of self-consistent ecloud effects, including mesh refinement, and generation of electrons from gas ionization and impact at the pipe walls. We also presented simulations of two consecutive bunches interacting with electrons clouds in the SPS, which included generation of secondary electrons. The distribution of electrons in front of the first beam was initialized from a dump taken from a preceding buildup calculation using the POSINST code. In this paper, we present an extension of this work where one full batch of 72 bunches is simulated in the SPS, including the entire buildup calculation and the self-consistent interaction between the bunches and the electrons. Comparisons to experimental data are also given.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {9}
}

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