DocumentCode :
1882476
Title :
Arcing phenomena on CEBAF RF-windows at cryogenic temperatures
Author :
Powers, Tom ; Kneisel, Peter ; Allen, Ray
Author_Institution :
CEBAF, Newport News, VA, USA
Volume :
3
fYear :
1995
fDate :
1-5 May 1995
Firstpage :
1645
Abstract :
During the CEBAF commissioning tests some of the superconducting cavities had light emitting discharges (arcing) which were observed in the guard vacuum space between a warm polymeric RF window and the cold ceramic RF window. A dedicated off-line test system was implemented to investigate the conditions under which arcing may occur and to gain some understanding of the mechanisms leading to this phenomenon through optical spectral analysis. This paper reports on the photoemission spectra observed during the dedicated tests on a single cell 1500 MHz niobium cavity with a ceramic window operated at 10 MV/m and 2 K. The light emission was detected using a spectrometer with an intensified photodiode array. The effect of moving the window away from the beam line using a waveguide elbow is reported
Keywords :
accelerator RF systems; accelerator cavities; arcs (electric); electron accelerators; photoelectron spectra; photoemission; storage rings; superconducting cavity resonators; waveguide components; 1500 MHz; 2 K; CEBAF; Nb; Nb cavity; RF-windows; arcing; ceramic RF window; cryogenic temperatures; light emission; photoemission spectra; polymeric RF window; superconducting cavities; Ceramics; Cryogenics; Optical polymers; Photoelectricity; Radio frequency; Spectral analysis; Stimulated emission; System testing; Temperature; Vacuum arcs;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2934-1
Type :
conf
DOI :
10.1109/PAC.1995.505314
Filename :
505314
Link To Document :
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