Arcing phenomena on CEBAF RF-windows at cryogenic temperatures

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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 ... continued below

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5 p.

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Powers, T.; Kneisel, P. & Allen, R. December 31, 1995.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 20 times . More information about this article can be viewed below.

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  • Powers, T.
  • Kneisel, P. Continuous Electron Beam Accelerator Facility, Newport News, VA (United States)
  • Allen, R. Old Dominion Univ., Norfolk, VA (United States)

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Description

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. 12 refs.

Physical Description

5 p.

Notes

INIS; OSTI as DE96013318

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  • 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995

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  • Other: DE96013318
  • Report No.: DOE/ER/40150--348
  • Report No.: CEBAF-PR--95-037;CONF-950512--397
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 377502
  • Archival Resource Key: ark:/67531/metadc678377

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 31, 1995

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 30, 2015, 3:41 p.m.

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Powers, T.; Kneisel, P. & Allen, R. Arcing phenomena on CEBAF RF-windows at cryogenic temperatures, article, December 31, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc678377/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.