Particle exhaust during neutral beam heating with the toroidal belt pump limiter ALT-II in TEXTOR
Particle collection, removal and exhaust by the toroidal belt pump limiter ALT-II have been measured in deuterium discharges with co-, counter-, and balanced injection of 48 keV neutral hydrogen particles. Particle collection increases from 50-80 A to 150-320 A during 1.2 MW of co- or counter-injection or 2.4 MW of balanced injection. The removal rate for pumping at two of the eight blades (3 of 15 scoops) reaches 2.7 Torr-l/s with a removal efficiency of nearly 45%. Extrapolating these results to a full belt with 15 scoops and eight pumps yields 140 amps of removal. This compares favourably with the maximum injectable current of 50 A and suggests that ALT-II with full pumping can provide sufficient exhaust during NI heating.
Bibliographic Reference: Paper presented: 16th European Conference on Controlled Fusion and Plasma Physics, Venezia (IT), March 18-17, 1989
Availability: Available from (1) as Paper EN 34783 ORA
Record Number: 198910645 / Last updated on: 1994-12-01
Original language: en
Available languages: en