U.S. Department of EnergyOffice of Scientific and Technical Information
Electron-Cloud Effects on Heavy-Ion Beams
Abstract
Stray electrons can be introduced in positive-charge accelerators for heavy ion fusion (or other applications) as a result of ionization of ambient gas or gas released from walls due to halo-ion impact, or as a result of secondary-electron emission. We are developing a capability for self-consistent simulation of ion beams with the electron clouds they produce. We report on an ingredient in this capability, the effect of specified electron cloud distributions on the dynamics of a coasting ion beam. We consider here electron distributions with axially varying density, centroid location, or radial shape, and examine both random and sinusoidally varying perturbations. We find that amplitude variations are most effective in spoiling ion beam quality, though for sinusoidal variations which match the natural ion beam centroid oscillation or breathing mode frequencies, the centroid and shape perturbations can also be effective. We identify a possible instability associated with resonance with the beam-envelope ''breathing'' mode. One conclusion from this study is that heavy-ion beams are surprisingly robust to electron clouds, compared to a priori expectations.
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- US Department of Energy (US)
- OSTI Identifier:
- 15009823
- Report Number(s):
- UCRL-TR-203297
TRN: US0406636
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: PBD: 29 Mar 2004
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATORS; AMPLITUDES; CLOUDS; ELECTRONS; HEAVY IONS; INSTABILITY; ION BEAMS; IONIZATION; OSCILLATIONS; RESONANCE; RESPIRATION; SHAPE; SIMULATION
Citation Formats
Azevedo, T, Friedman, A, Cohen, R, and Vay, J. Electron-Cloud Effects on Heavy-Ion Beams. United States: N. p., 2004.
Web. doi:10.2172/15009823.
Azevedo, T, Friedman, A, Cohen, R, & Vay, J. Electron-Cloud Effects on Heavy-Ion Beams. United States. https://doi.org/10.2172/15009823
Azevedo, T, Friedman, A, Cohen, R, and Vay, J. 2004.
"Electron-Cloud Effects on Heavy-Ion Beams". United States. https://doi.org/10.2172/15009823. https://www.osti.gov/servlets/purl/15009823.
@article{osti_15009823,
title = {Electron-Cloud Effects on Heavy-Ion Beams},
author = {Azevedo, T and Friedman, A and Cohen, R and Vay, J},
abstractNote = {Stray electrons can be introduced in positive-charge accelerators for heavy ion fusion (or other applications) as a result of ionization of ambient gas or gas released from walls due to halo-ion impact, or as a result of secondary-electron emission. We are developing a capability for self-consistent simulation of ion beams with the electron clouds they produce. We report on an ingredient in this capability, the effect of specified electron cloud distributions on the dynamics of a coasting ion beam. We consider here electron distributions with axially varying density, centroid location, or radial shape, and examine both random and sinusoidally varying perturbations. We find that amplitude variations are most effective in spoiling ion beam quality, though for sinusoidal variations which match the natural ion beam centroid oscillation or breathing mode frequencies, the centroid and shape perturbations can also be effective. We identify a possible instability associated with resonance with the beam-envelope ''breathing'' mode. One conclusion from this study is that heavy-ion beams are surprisingly robust to electron clouds, compared to a priori expectations.},
doi = {10.2172/15009823},
url = {https://www.osti.gov/biblio/15009823},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 29 00:00:00 EST 2004},
month = {Mon Mar 29 00:00:00 EST 2004}
}