Physics of collisionless scrape-off-layer plasma during normal and off-normal Tokamak operating conditions.

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Description

The structure of a collisionless scrape-off-layer (SOL) plasma in tokamak reactors is being studied to define the electron distribution function and the corresponding sheath potential between the divertor plate and the edge plasma. The collisionless model is shown to be valid during the thermal phase of a plasma disruption, as well as during the newly desired low-recycling normal phase of operation with low-density, high-temperature, edge plasma conditions. An analytical solution is developed by solving the Fokker-Planck equation for electron distribution and balance in the SOL. The solution is in good agreement with numerical studies using Monte-Carlo methods. The analytical solutions ... continued below

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44 p.

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Hassanein, A. & Konkashbaev, I. March 15, 1999.

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Description

The structure of a collisionless scrape-off-layer (SOL) plasma in tokamak reactors is being studied to define the electron distribution function and the corresponding sheath potential between the divertor plate and the edge plasma. The collisionless model is shown to be valid during the thermal phase of a plasma disruption, as well as during the newly desired low-recycling normal phase of operation with low-density, high-temperature, edge plasma conditions. An analytical solution is developed by solving the Fokker-Planck equation for electron distribution and balance in the SOL. The solution is in good agreement with numerical studies using Monte-Carlo methods. The analytical solutions provide an insight to the role of different physical and geometrical processes in a collisionless SOL during disruptions and during the enhanced phase of normal operation over a wide range of parameters.

Physical Description

44 p.

Notes

INIS; OSTI as DE00012062

Medium: P; Size: 44 pages

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  • Other Information: PBD: 15 Mar 1999

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  • Report No.: ANL/FPP/TM-296
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/12062 | External Link
  • Office of Scientific & Technical Information Report Number: 12062
  • Archival Resource Key: ark:/67531/metadc618582

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  • March 15, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 12, 2017, 4:41 p.m.

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Hassanein, A. & Konkashbaev, I. Physics of collisionless scrape-off-layer plasma during normal and off-normal Tokamak operating conditions., report, March 15, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc618582/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.