Transport calculations of chemically sputtered carbon near a plasma divertor surface

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The transport of chemically sputtered carbon near a tokamak divertor surface has been analyzed with the Monte Carlo code WBC. The code follows the motion of sputtered methane atoms and the resulting carbon and hydrocarbon derivatives. Ion transport due to the magnetic field, sheath electric field, and collisions with the plasma is computed. Redeposition fractions, impinging species type, charge state, and velocity have been analyzed. For plasma temperatures {ge} 10 eV, and for typical divertor plasma densities, local redeposition of chemically sputtered carbon approaches 100%. Redeposition fractions are lower ({approximately}80%) for lower temperatures and/or lower density. Physical sputtering of carbon ... continued below

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15 p.

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Brooks, J. N. January 1, 1992.

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Description

The transport of chemically sputtered carbon near a tokamak divertor surface has been analyzed with the Monte Carlo code WBC. The code follows the motion of sputtered methane atoms and the resulting carbon and hydrocarbon derivatives. Ion transport due to the magnetic field, sheath electric field, and collisions with the plasma is computed. Redeposition fractions, impinging species type, charge state, and velocity have been analyzed. For plasma temperatures {ge} 10 eV, and for typical divertor plasma densities, local redeposition of chemically sputtered carbon approaches 100%. Redeposition fractions are lower ({approximately}80%) for lower temperatures and/or lower density. Physical sputtering of carbon due to redeposition of chemically sputtered material is low but a hydrocarbon reflection cascade due to redeposition may be high.

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15 p.

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OSTI; NTIS; INIS; GPO Dep.

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  • Other Information: PBD: Jan 1992

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  • Other: DE92009022
  • Report No.: ANL/FPP/TM--259
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/10125584 | External Link
  • Office of Scientific & Technical Information Report Number: 10125584
  • Archival Resource Key: ark:/67531/metadc1275530

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Creation Date

  • January 1, 1992

Added to The UNT Digital Library

  • Oct. 12, 2018, 6:44 a.m.

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  • April 8, 2019, 12:47 p.m.

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Brooks, J. N. Transport calculations of chemically sputtered carbon near a plasma divertor surface, report, January 1, 1992; United States. (https://digital.library.unt.edu/ark:/67531/metadc1275530/: accessed May 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.