Radiation-enhanced sublimation of graphite in PISCES experiments
- Sandia, Alburquerque, New Mexico 87185 (USA)
- Max-Plank Institut fuer Plasmaphysik, EURATOM Association, D-8046 Garching/Munchen (Federal Republic of Germany)
- Institut fuer Chemie 1, KFA Juelich, EURATOM Association D-517 Juelich 1 (Federal Republic of Germany)
- UCLA, Los Angeles, CA (USA)
Radiation enhanced sublimation (RES) of graphite leads to potentially high erosion rates in advanced fusion devices (Compact Ignition Tokamak, CIT) and (the International Thermonuclear Experimental Reactor ITER) and may be important in the carbon blooms'' observed in Tokamak Fusion Test Reactor (TFTR) and the Joint European Torus (JET). Erosion rates measured by weight loss are reported for POCO graphite exposed to helium plasmas for a temperature range from 900--2000 {degree}C, ion energies of 30--300 eV, ion fluxes of 1--6{times}10{sup 18} cm{sup {minus}2} s{sup {minus}1}, densities of 2--10{times}10{sup 12} cm{sup {minus}3}, and electron temperatures of 4--10 eV. These are the first data on RES at fusion-relevant particle fluxes. The data show little reduction from a direct linear dependence upon flux. For these conditions, the amount of redeposition and carbon self-sputtering was minimal. Over 1700 {degree}C, there is evidence of electron emission from the sample.
- DOE Contract Number:
- AS03-84ER52104
- OSTI ID:
- 6745507
- Journal Information:
- Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA) Vol. 8:3; ISSN JVTAD; ISSN 0734-2101
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
CARBON
DEPOSITION
ELECTRON TEMPERATURE
ELEMENTAL MINERALS
ELEMENTS
EROSION
EVAPORATION
GRAPHITE
ION DENSITY
MINERALS
NONMETALS
PHASE TRANSFORMATIONS
PLASMA DENSITY
SUBLIMATION
VERY HIGH TEMPERATURE