Transverse fields in dielectric wake field accelerators
- Omega-P, Inc. 202008 Yale Station, New Haven, Connecticut 06520-2008 (United States)
- Department of Physics, Yale University, POB 8120, New Haven, Connecticut 06520-8120 (United States)
Theory is presented for excitation of hybrid electric/magnetic ({ital HEM}) wake-field modes by passage of an electron drive bunch in a dielectric-lined cylindrical waveguide. The drive bunch is moving parallel to the waveguide axis, but is displaced by a radial increment r{sub 0}. Knowledge of the amplitudes of all {ital HEM} modes allows calculation of the transverse forces on a bunch or bunches that follow the displaced drive bunch. Approximate formulas for the transverse forces on a trailing bunch are given, valid in the limit of small r{sub 0}. These transverse forces can lead to beam instability, if cumulative transverse motion is significant on the time-scale of passage of the bunch through the accelerator module. Constructive interference can be present amongst TM{sub 0m} monopole modes that produce highly-peaked spatiotemporally-localized axial wake-fields, with peak fields at the locations of trailing bunches in a multi-bunch train. In this case, the spectrum of dipole (and higher order) {ital HEM} modes may not enjoy the same degree of constructive interference, and may not have the same axial periodicity as the monopole modes. Further analytical and computational study is needed to determine the limitations that transverse wake fields may impose on a multi-bunch dielectric wake-field accelerator. {copyright} {ital 1999 American Institute of Physics.}
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 687958
- Report Number(s):
- CONF-980742--
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 472; ISSN 0094-243X; ISSN APCPCS
- Country of Publication:
- United States
- Language:
- English
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