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Title: A field symmetrized dual feed 2 MeV RF gun for a 17 GHz electron linear accelerator

Abstract

An undesirable feature that contributes to beam emittance growth, and prevents the full potential of laser driven, short wavelength RF guns from being realized, is the presence of field asymmetries introduced by the input power coupling aperture in the sidewall of the cavity. Means of avoiding these field asymmetries in a three cavity RF gun structure, by feeding RF power into the middle cavity through diametrically opposed coupling apertures in the sidewalls of the cavity and by using a racetrack (rather than a cylindrical) shaped coupling cavity are described. An analysis of the {pi}-mode structure indicated that, although E-field balancing of the three-cell circuit was very sensitive to small departures from the resonant condition, the proposed microtuner mechanisms on each end cavity could readily correct for these resonant errors. Furthermore, unlike the use of tuning probes in the outer wall of the cavities, the slight axial deformation produced by the end wall microtuners enables the symmetrized field distributions to be conserved. Beam optics analyses indicate that a peak E-field of 200 MV/m and an energy gain of 2 MeV can be achieved with this 17 GHz RF gun using a peak input power of less than 3 MW. The designmore » parameters of the three cavity structure are discussed: the results of beam optics studies and the racetrack coupler cavity field symmetrization data are presented: and details of the cavity microtuners and the high power rectangular waveguide network components, are described.« less

Authors:
; ;  [1]
  1. Haimson Research Corporation, 3350 Scott Blvd., Building 60, Santa Clara, California 95054-3104 (United States)
Publication Date:
OSTI Identifier:
21205410
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 472; Journal Issue: 1; Conference: 8. workshop on advanced accelerator concepts, Baltimore, MD (United States), 6-11 Jul 1998; Other Information: DOI: 10.1063/1.58920; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; APERTURES; BEAM EMITTANCE; BEAM OPTICS; BEAM-BEAM INTERACTIONS; CAVITY RESONATORS; COUPLING; DESIGN; ELECTRON BEAMS; ELECTRON GUNS; ELECTRONS; GAIN; GHZ RANGE; LASERS; LINEAR ACCELERATORS; MEV RANGE; PHOTON BEAMS; RF SYSTEMS; WAVEGUIDES

Citation Formats

Haimson, J, Mecklenburg, B, and Stowell, G. A field symmetrized dual feed 2 MeV RF gun for a 17 GHz electron linear accelerator. United States: N. p., 1999. Web. doi:10.1063/1.58920.
Haimson, J, Mecklenburg, B, & Stowell, G. A field symmetrized dual feed 2 MeV RF gun for a 17 GHz electron linear accelerator. United States. https://doi.org/10.1063/1.58920
Haimson, J, Mecklenburg, B, and Stowell, G. 1999. "A field symmetrized dual feed 2 MeV RF gun for a 17 GHz electron linear accelerator". United States. https://doi.org/10.1063/1.58920.
@article{osti_21205410,
title = {A field symmetrized dual feed 2 MeV RF gun for a 17 GHz electron linear accelerator},
author = {Haimson, J and Mecklenburg, B and Stowell, G},
abstractNote = {An undesirable feature that contributes to beam emittance growth, and prevents the full potential of laser driven, short wavelength RF guns from being realized, is the presence of field asymmetries introduced by the input power coupling aperture in the sidewall of the cavity. Means of avoiding these field asymmetries in a three cavity RF gun structure, by feeding RF power into the middle cavity through diametrically opposed coupling apertures in the sidewalls of the cavity and by using a racetrack (rather than a cylindrical) shaped coupling cavity are described. An analysis of the {pi}-mode structure indicated that, although E-field balancing of the three-cell circuit was very sensitive to small departures from the resonant condition, the proposed microtuner mechanisms on each end cavity could readily correct for these resonant errors. Furthermore, unlike the use of tuning probes in the outer wall of the cavities, the slight axial deformation produced by the end wall microtuners enables the symmetrized field distributions to be conserved. Beam optics analyses indicate that a peak E-field of 200 MV/m and an energy gain of 2 MeV can be achieved with this 17 GHz RF gun using a peak input power of less than 3 MW. The design parameters of the three cavity structure are discussed: the results of beam optics studies and the racetrack coupler cavity field symmetrization data are presented: and details of the cavity microtuners and the high power rectangular waveguide network components, are described.},
doi = {10.1063/1.58920},
url = {https://www.osti.gov/biblio/21205410}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 472,
place = {United States},
year = {Mon Jul 12 00:00:00 EDT 1999},
month = {Mon Jul 12 00:00:00 EDT 1999}
}