NDLI: Arcing phenomena on CEBAF RF-windows at cryogenic temperatures

Content Provider	IEEE Xplore Digital Library
Author	Powers, T. Kneisel, P. Allen, R.
Copyright Year	1995
Description	Author affiliation: CEBAF, Newport News, VA, USA (Powers, T.; Kneisel, P.)
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.
Starting Page	1645
Ending Page	1647
File Size	359724
Page Count	3
File Format	PDF
ISBN	0780329341
DOI	10.1109/PAC.1995.505314
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-05-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cryogenics Temperature Radio frequency Ceramics Vacuum arcs System testing Stimulated emission Optical polymers Spectral analysis Photoelectricity
Content Type	Text
Resource Type	Article

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