Plasma ignition schemes for the SNS radio-frequency driven H- source

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Description

The H{sup -} ion source for the Spallation Neutron Source (SNS) is a cesiated, radio-frequency driven (2 MHz) multicusp volume source which operates at a duty cycle of 6% (1 ms pulses and 60 Hz). In pulsed RF driven plasma sources, ignition of the plasma affects the stability of source operation and the antenna lifetime. We are reporting on investigations of different ignition schemes, based on secondary electron generation in the plasma chamber by UV light, a hot filament, a low power RF plasma (cw, 13.56 MHz), as well as source operation solely with the high power (40 kW) 2 ... continued below

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15 pages

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Schenkel, T.; Staples, J.W.; Thomae, W.; Reijonen, J.; Gough, R.A.; Leung, K.N. et al. September 6, 2001.

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Description

The H{sup -} ion source for the Spallation Neutron Source (SNS) is a cesiated, radio-frequency driven (2 MHz) multicusp volume source which operates at a duty cycle of 6% (1 ms pulses and 60 Hz). In pulsed RF driven plasma sources, ignition of the plasma affects the stability of source operation and the antenna lifetime. We are reporting on investigations of different ignition schemes, based on secondary electron generation in the plasma chamber by UV light, a hot filament, a low power RF plasma (cw, 13.56 MHz), as well as source operation solely with the high power (40 kW) 2 MHz RF. We find that the dual frequency, single antenna scheme is most attractive for the operating conditions of the SNS H{sup -} source.

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15 pages

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INIS; OSTI as DE00788039

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  • 9th International Conference on Ion Sources (ICIS'01), Oakland, CA (US), 09/03/2001--09/07/2001

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  • Report No.: LBNL--47775
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 788039
  • Archival Resource Key: ark:/67531/metadc719958

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  • September 6, 2001

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • April 4, 2016, 4:25 p.m.

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Schenkel, T.; Staples, J.W.; Thomae, W.; Reijonen, J.; Gough, R.A.; Leung, K.N. et al. Plasma ignition schemes for the SNS radio-frequency driven H- source, article, September 6, 2001; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc719958/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.