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Coupler Design for the LCLS Injector S-Band Structures [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2006.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
3 pages : digital, PDF file
Additional Creators
Stanford Linear Accelerator Center, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The LCLS injector is required to provide a 1-nC, 10-ps bunch with a normalized rms transverse projected emittance of less than 1 micron. The LCLS beam is generated and accelerated in a 1.6-cell S-band RF gun at 120 MV/m up to 6 MeV. The gun is followed by two SLAC 3-m S-band accelerator structures to further accelerate the beam to 135 MeV which moves the beam out of the space-charge dominated regime. In the SLAC S-band structures, the RF power feed is through a single coupling-hole (single-feed coupler) which results in a field asymmetry. The time dependent multipole fields in the coupler induce a transverse kick along the bunch and cause the emittance to increase above the LCLS specification. To meet the stringent emittance requirements for the injector, the single-feed couplers will be replaced by a dual-feed racetrack design to minimize the multipole field effects. We will present detailed studies of the multipole fields in the SLAC linac RF coupler and the improvements with the dual-feed ractrack design using the parallel finite element S-parameter solver S3P.
Report Numbers
E 1.99:slac-pub-11728
slac-pub-11728
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
03/03/2006.
"slac-pub-11728"
Prepared for Particle Accelerator Conference (PAC 05), Knoxville, Tennessee, 16-20 May 2005.
Schultz, D.C.; Chan, J.; Li, Z.; Xiao, L.; Dowell, D.H.; Schmerge, J.F.; Limborg-Deprey, C.; Bentson, L.D.
Funding Information
AC02-76SF00515
View MARC record | catkey: 14683095