Effect of Boronization on Ohmic Plasmas in NSTX

Technical Report · Tue Mar 27 00:00:00 EST 2001

DOI:https://doi.org/10.2172/781481· OSTI ID:781481

Skinner, C H; Kugel, H; Maingi, R; Wampler, W R; Blanchard, W; Bell, M; Bell, R; LeBlanc, B; Gates, D; Kaye, S; LaMarche, P; Menard, J; Mueller, D; Na, H K; Nishino, N; Paul, S; Sabbagh, S; Soukhanovskii, V

Boronization of the National Spherical Torus Experiment (NSTX) has enabled access to higher density, higher confinement plasmas. A glow discharge with 4 mTorr helium and 10% deuterated trimethyl boron deposited 1.7 g of boron on the plasma facing surfaces. Ion beam analysis of witness coupons showed a B+C areal density of 10 to the 18 (B+C) cm to the -2 corresponding to a film thickness of 100 nm. Subsequent ohmic discharges showed oxygen emission lines reduced by x15, carbon emission reduced by two and copper reduced to undetectable levels. After boronization, the plasma current flattop time increased by 70% enabling access to higher density, higher confinement plasmas.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 781481
• Report Number(s): PPPL-3553; TRN: US0102987
• Resource Relation: Other Information: PBD: 27 Mar 2001
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
NSTX DEVICE
FIRST WALL
BORON
CARBON
GLOW DISCHARGES
ION BEAMS