Particle exhaust during neutral injection by the ALT-II pump limiter in TEXTOR
The ALT-II toroidal belt pump limiter has been used for particle exhaust during discharges heated by neutral beam injection (NI) in the TEXTOR tokamak. Pumping is now available at all eight blades, whereas previously only two blades had been pumped. Results from discharges with co- and counter-injection are presented in this paper. Large rises (approximately 3x over ohmic conditions) in collected flux are observed in the collection scoops with NI, but the electron temperature rise is modest. The plasma density near the neutralisers is substantially higher than at the scoop entrances. Total collected fluxes at the neutralisers have reached 16x1.0 E20 ions/s (260 A), and removal rates of nearly 7x1.0 E20 atoms/s (15 mbarl/s) have been measured, compared to 1.6x1.0 E20 atoms/s injected in a neutral beam.
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 176 & 177 (1990) pp. 810-815
Record Number: 199110645 / Last updated on: 1994-12-02
Original language: en
Available languages: en