Interaction of the neutral deuterium flux with a field-reversed configuration

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Recycling effects arising from the penetration of cold neutrals into a hot plasma has been known to contribute to confinement properties of tokamaks, mirrors, RFPs, and spheromaks. To data, however, ionization and charge exchange processes associated with the possible influx of neutrals have been neglected in FRC transport models, or their effects have been found negligible for experiments with short lifetimes (< 20 ..mu..s). These processes are also neglected when ascertaining the experimental particle confinement time tau/sub N/. As experimental FRC lifetimes have recently been extended to record values (greater than or equal to 300 ..mu..s), these effects on transport ... continued below

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Pages: 5

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Rej, D.J. January 1, 1984.

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Description

Recycling effects arising from the penetration of cold neutrals into a hot plasma has been known to contribute to confinement properties of tokamaks, mirrors, RFPs, and spheromaks. To data, however, ionization and charge exchange processes associated with the possible influx of neutrals have been neglected in FRC transport models, or their effects have been found negligible for experiments with short lifetimes (< 20 ..mu..s). These processes are also neglected when ascertaining the experimental particle confinement time tau/sub N/. As experimental FRC lifetimes have recently been extended to record values (greater than or equal to 300 ..mu..s), these effects on transport may no longer be negligible. Furthermore, these losses can be enhanced when FRCs translate at axial speeds much greater than the thermal speeds of the neutrals. The purpose of this analysis is to examine the interaction of neutral deuterium with an FRC. The relevant atomic and molecular processes are reviewed. A simple, steady-state, multi-species 1-D (radial) neutral transport model is described and applied to FRC plasma parameters observed earlier. Estimates of the power loss due to these neutrals are made for both stationary and translating plasmas.

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Pages: 5

Notes

NTIS, PC A02/MF A01; 1.

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  • 6. US-Japan symposium on compact toroid research, Princeton, NJ, USA, 20 Feb 1984

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  • Other: DE84007488
  • Report No.: LA-UR-84-601
  • Report No.: CONF-840255-1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5239486
  • Archival Resource Key: ark:/67531/metadc1068364

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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.

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  • January 1, 1984

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  • Feb. 4, 2018, 10:51 a.m.

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  • May 29, 2018, 6:51 p.m.

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Rej, D.J. Interaction of the neutral deuterium flux with a field-reversed configuration, article, January 1, 1984; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1068364/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.