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Title: A theoretical study of the electron-proton instability in a long proton pulse

Abstract

The electron-proton instability of a long, intense, and partially neutralized proton bunch is studied by numerically solving the equations of motion for the line centroid of the proton beam and the line centroid of the trapped electrons. The formalism takes into account the effects of variable line densities and alternating-gradient focusing. Good qualitative agreement between the computational results and experimental observations was obtained when applying the theory to the Los Alamos Proton Storage Ring (PSR). Both the case of a clean extraction gap and the case with a few percent of protons in the extraction gap were studied. It is found that with only a few percent neutralization, the PSR beam can become unstable in both cases. The same equations and method were used to study the stability of the proton beam in the accumulator ring of the proposed LANSCE II spallation-neutron source. The results indicate that the e-p instability can also occur in the LANSCE II accumulator ring for only a few percent neutralization.

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
88662
Report Number(s):
LA-UR-95-1567; CONF-950512-146
ON: DE95011972; TRN: 95:017609
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995; Other Information: PBD: [1995]
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; LAMPF LINAC; STORAGE RINGS; BEAM DYNAMICS; PROTON BEAMS; ELECTRONS

Citation Formats

Wang, Tai-Sen F. A theoretical study of the electron-proton instability in a long proton pulse. United States: N. p., 1995. Web.
Wang, Tai-Sen F. A theoretical study of the electron-proton instability in a long proton pulse. United States.
Wang, Tai-Sen F. 1995. "A theoretical study of the electron-proton instability in a long proton pulse". United States. https://www.osti.gov/servlets/purl/88662.
@article{osti_88662,
title = {A theoretical study of the electron-proton instability in a long proton pulse},
author = {Wang, Tai-Sen F},
abstractNote = {The electron-proton instability of a long, intense, and partially neutralized proton bunch is studied by numerically solving the equations of motion for the line centroid of the proton beam and the line centroid of the trapped electrons. The formalism takes into account the effects of variable line densities and alternating-gradient focusing. Good qualitative agreement between the computational results and experimental observations was obtained when applying the theory to the Los Alamos Proton Storage Ring (PSR). Both the case of a clean extraction gap and the case with a few percent of protons in the extraction gap were studied. It is found that with only a few percent neutralization, the PSR beam can become unstable in both cases. The same equations and method were used to study the stability of the proton beam in the accumulator ring of the proposed LANSCE II spallation-neutron source. The results indicate that the e-p instability can also occur in the LANSCE II accumulator ring for only a few percent neutralization.},
doi = {},
url = {https://www.osti.gov/biblio/88662}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 01 00:00:00 EDT 1995},
month = {Mon May 01 00:00:00 EDT 1995}
}

Conference:
Other availability
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