Improved plasma performance in TEXTOR with silicon coated surfaces

Journal Article · Mon Sep 06 04:00:00 EDT 1993 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.71.1549· OSTI ID:6072564

Winter, J; Esser, H G; Jackson, G L; Koenen, L; Messiaen, A; Ongena, J; Philipps, V; Pospiesczcyk, A; Samm, U; Schweer, B; Unterberg, B

Coating of the walls of TEXTOR with silicon has led to improved tokamak plasma performance. Very low concentrations of C, B, and O are measured. Radiation from silicon is located at the plasma periphery at [ital r]/[ital a][ge]0.75 and decreases with increasing plasma density. Density limits are enhanced by 30% as compared to boronized conditions; large density gradients and low electron temperatures at the edge ([lt]10 eV) are obtained. The improved confinement regimes observed earlier at low densities [[tau][sub [ital E]]=1.7[times]ITER L 89-P (International Thermonuclear Experimental Reactor)] were extended to significantly higher densities in spite of a high radiative power fraction.

• OSTI ID: 6072564
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 71:10; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310* -- Plasma Confinement-- (1992-)
700320 -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
BORON
CARBON
CLOSED PLASMA DEVICES
COATINGS
CONFINEMENT
DATA
ELECTRON TEMPERATURE
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN
INFORMATION
MODIFICATIONS
NONMETALS
NUMERICAL DATA
OXYGEN
PLASMA
PLASMA CONFINEMENT
PLASMA DENSITY
PLASMA DIAGNOSTICS
POWER
SEMIMETALS
SILICON
TEXTOR TOKAMAK
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
WALLS