Control of the floating potential fluctuations via limiter biasing in the Saskatchewan Torus-Modified (STOR-M) tokamak

Journal Article · Tue Nov 01 04:00:00 EST 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870899· OSTI ID:6640871

Zhang, W; Xiao, C; Zhang, L; Hirose, A ^[1]

---

1. Plasma Physics Laboratory, Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 0W0 (Canada)

Limiter biasing experiments have been performed in the STOR-M tokamak (Saskatchewan Torus-Modified) [Phys. Fluids B [bold 4], 3277 (1992)]. It is found that the floating potential fluctuation amplitudes in the scrape-off layer (SOL) depend mainly on the limiter potential and this potential determines the current flowing toward the limiter. The dependence of the fluctuation amplitude on the potential gradient in the SOL is rather weak. For positive limiter bias, a strong suppression of the floating potential fluctuation is observed, while for negative limiter biasing the floating potential fluctuations are significantly enhanced. The observed phenomena are consistent with recent theoretical studies [Phys. Fluids B [bold 5], 3191 (1993)].

• OSTI ID: 6640871
• Journal Information: Physics of Plasmas; (United States), Journal Name: Physics of Plasmas; (United States) Vol. 1:11; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
700350 -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
BOUNDARY LAYERS
CLOSED PLASMA DEVICES
CONTROL
FLUCTUATIONS
LAYERS
LIMITERS
PLASMA DIAGNOSTICS
PLASMA SCRAPE-OFF LAYER
PLASMA SHEATH
POTENTIALS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VARIATIONS