Charge state of sputtered impurity ions near a limiter or divertor in a tokamak

Technical Report · Tue Mar 01 00:00:00 EST 1983

DOI:https://doi.org/10.2172/6232799· OSTI ID:6232799

Boley, C D; Brooks, J N; Kim, Y K

Many impurity atoms sputtered from a limiter or divertor plate are ionized in the scrapeoff zone and return to the sputtering surface bacause of friction with incoming plasma ions. The final charge state attained by such impurities has been calculated for a variety of plasma edge conditions. The surface materials considered are tungsten, beryllium, beryllium oxide, and carbon. Estimates of the successive ionization cross sections for tungsten are developed. In all cases examined, returning impurity ions are found to be multiply ionized. This implies a significant energy gain in the sheath region, with important implications for self-sputtering of redeposited surface material.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 6232799
• Report Number(s): ANL/FPP/TM-171; ON: DE83012305
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DIVERTORS
SPUTTERING
LIMITERS
TOKAMAK DEVICES
IMPURITIES
BERYLLIUM
BERYLLIUM OXIDES
CARBON
CROSS SECTIONS
ELECTRIC CHARGES
IONIZATION
TUNGSTEN
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
BERYLLIUM COMPOUNDS
CHALCOGENIDES
CLOSED PLASMA DEVICES
ELEMENTS
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
THERMONUCLEAR DEVICES
TRANSITION ELEMENTS
700209* - Fusion Power Plant Technology- Component Development & Materials Testing