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Title: RF Breakdown in Normal Conducting Single-Cell Structures

Operating accelerating gradient in normal conducting accelerating structures is often limited by rf breakdown. The limit depends on multiple parameters, including input rf power, rf circuit, cavity shape and material. Experimental and theoretical study of the effects of these parameters on the breakdown limit in full scale structures is difficult and costly. We use 11.4 GHz single-cell traveling wave and standing wave accelerating structures for experiments and modeling of rf breakdown behavior. These test structures are designed so that the electromagnetic fields in one cell mimic the fields in prototype multicell structures for the X-band linear collider. Fields elsewhere in the test structures are significantly lower than that of the single cell. The setup uses matched mode converters that launch the circular TM{sub 01} mode into short test structures. The test structures are connected to the mode launchers with vacuum rf flanges. This setup allows economic testing of different cell geometries, cell materials and preparation techniques with short turn-around time. Simple 2D geometry of the test structures simplifies modeling of the breakdown currents and their thermal effects.
Authors:
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Publication Date:
OSTI Identifier:
876600
Report Number(s):
SLAC-PUB-11707
TRN: US0601254
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Particle Accelerator Conference (PAC 05), Knoxville, Tennessee, 5/16/2005-5/20/2005
Research Org:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; BREAKDOWN; ECONOMICS; ELECTROMAGNETIC FIELDS; FLANGES; GEOMETRY; LINEAR COLLIDERS; SHAPE; SIMULATION; STANDING WAVES; TEMPERATURE DEPENDENCE; TESTING Accelerators,ACCPHY