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Abstract

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.

Additional information

Authors: MOYER R A, University of California, Los Angeles (US);DOERNER R P, University of California, Los Angeles (US);GRAY D, University of California, Los Angeles (US);CONN R W, University of California, Los Angeles (US);CORBETT W J, University of California, Los Angeles (US);TEXTOR TEAM, University of California, Los Angeles (US);DIPPEL K H, Institut für Plasmaphysik, KFA Jülich GmbH (DE);FINKEN K H, Institut für Plasmaphysik, KFA Jülich GmbH (DE);HARDTKE A, Institut für Plasmaphysik, KFA Jülich GmbH (DE);NI TEAM, Institut für Plasmaphysik, KFA Jülich GmbH (DE);NAKAMURA K, Plasma Engineering Laboratory, Naka Fusion Research Estab., JAERI, Naka-machi (JP);WATKINS J G, Sandia National Laboratories, Albuquerque, New Mexico (US)
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
Category: PUBLICATION
Original language: en
Available languages: en