Transport calculations of chemically sputtered carbon near a plasma divertor surface

Technical Report · Wed Jan 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/5900717· OSTI ID:5900717

Brooks, J N

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.

• Research Organization: Argonne National Lab., IL (United States). Fusion Power Program
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5900717
• Report Number(s): ANL/FPP/TM-259; ON: DE92009022
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700330 -- Plasma Kinetics
Transport
& Impurities-- (1992-)
700380 -- Elementary & Classical Processes in Plasmas-- (1992-)
700420* -- Fusion Technology-- Plasma-Facing Components-- (1992-)
CARBON IONS
CHARGED PARTICLES
CHARGED-PARTICLE TRANSPORT
CLOSED PLASMA DEVICES
COLLISIONS
DIVERTORS
ELECTRON COLLISIONS
HYDROCARBONS
IMPURITIES
IONS
MONTE CARLO METHOD
ORGANIC COMPOUNDS
PLASMA IMPURITIES
RADIATION TRANSPORT
SPUTTERING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES