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Title: The RF Design of an HOM Polarized RF Gun for the ILC

Abstract

The ILC requires a polarized electron beam. While a highly polarized beam can be produced by a GaAs-type cathode in a DC gun of the type currently in use at SLAC, JLAB and elsewhere, the ILC injector system can be simplified and made more efficient if a GaAs-type cathode can be combined with a low emittance RF gun. Since this type of cathode is known to be extremely sensitive to vacuum contamination including back bombardment by electrons and ions, any successful polarized RF gun must have a significantly improved operating vacuum compared to existing RF guns. We present a new RF design for an L-Band normal conducting (NC) RF gun for the ILC polarized electron source. This design incorporates a higher order mode (HOM) structure, whose chief virtue in this application is an improved conductance for vacuum pumping on the cathode. Computer simulation models have been used to optimize the RF parameters with two principal goals: first to minimize the required RF power; second to reduce the peak surface field relative to the field at the cathode in order to suppress field emitted electron bombardment. The beam properties have been simulated initially using PARMELA. Vacuum and other practical issues formore » implementing this design are discussed.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
895262
Report Number(s):
SLAC-PUB-12190
TRN: US0700465
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Presented at 2006 Linear Accelerator Conference (LINAC 06), Knoxville, Tennessee, 21-25 Aug 2006
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CATHODES; COMPUTERIZED SIMULATION; CONTAMINATION; DESIGN; ELECTRON BEAMS; ELECTRON SOURCES; ELECTRONS; LINEAR ACCELERATORS; POLARIZED BEAMS; PUMPING; STANFORD LINEAR ACCELERATOR CENTER; Accelerators,ACCPHY

Citation Formats

Wang, J W, Clendenin, J E, Colby, E R, Miller, R A, /SLAC, Lewellen, J W, and /Argonne. The RF Design of an HOM Polarized RF Gun for the ILC. United States: N. p., 2006. Web.
Wang, J W, Clendenin, J E, Colby, E R, Miller, R A, /SLAC, Lewellen, J W, & /Argonne. The RF Design of an HOM Polarized RF Gun for the ILC. United States.
Wang, J W, Clendenin, J E, Colby, E R, Miller, R A, /SLAC, Lewellen, J W, and /Argonne. 2006. "The RF Design of an HOM Polarized RF Gun for the ILC". United States. https://www.osti.gov/servlets/purl/895262.
@article{osti_895262,
title = {The RF Design of an HOM Polarized RF Gun for the ILC},
author = {Wang, J W and Clendenin, J E and Colby, E R and Miller, R A and /SLAC and Lewellen, J W and /Argonne},
abstractNote = {The ILC requires a polarized electron beam. While a highly polarized beam can be produced by a GaAs-type cathode in a DC gun of the type currently in use at SLAC, JLAB and elsewhere, the ILC injector system can be simplified and made more efficient if a GaAs-type cathode can be combined with a low emittance RF gun. Since this type of cathode is known to be extremely sensitive to vacuum contamination including back bombardment by electrons and ions, any successful polarized RF gun must have a significantly improved operating vacuum compared to existing RF guns. We present a new RF design for an L-Band normal conducting (NC) RF gun for the ILC polarized electron source. This design incorporates a higher order mode (HOM) structure, whose chief virtue in this application is an improved conductance for vacuum pumping on the cathode. Computer simulation models have been used to optimize the RF parameters with two principal goals: first to minimize the required RF power; second to reduce the peak surface field relative to the field at the cathode in order to suppress field emitted electron bombardment. The beam properties have been simulated initially using PARMELA. Vacuum and other practical issues for implementing this design are discussed.},
doi = {},
url = {https://www.osti.gov/biblio/895262}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Nov 15 00:00:00 EST 2006},
month = {Wed Nov 15 00:00:00 EST 2006}
}

Conference:
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