Community Research and Development Information Service - CORDIS


The Advanced Limiter Test-II (ALT-II) is a large area toroidal pump limiter in the TEXTOR tokamak. Discrete target plates located in channels at eight toroidal positions behind the main limiter surface neutralise a portion of the plasma efflux from the core. The resulting gas is exhausted by eight external pumps. The primary experimental goals of ALT-II are aimed at power loading studies and plasma density control during long pulse (4 s), high power (6 MW) tokamak discharges. It is found that both the power and the plasma flow to the limiter are asymmetric and depend on line density. Peak neutral pressures of 0.8 m torr and removal rates of up to 0.15 torr L/s per pump station are achieved in the ohmic phase. The projected exhaust efficiency of ALT-II with full pumping is 5-10%. During ion cyclotron resonance frequency heating, the particle removal rate exceeds 0.4 torr L/s per blade, and the exhaust efficiency is 4-5% for power levels up to 2.6 MW.

Additional information

Authors: CORBETT W J ET AL., University of California, Los Angeles (US);DIPPEL K H ET AL., Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);GAUSTER W B ET AL., Sandia National Laboratories, Albuquerque (US);MIYAHARA A, National Institute for Fusion Science, Nagoya (JP);SAGARA A, National Institute for Fusion Science, Nagoya (JP);ICRH TEAM, Ecole Royale Militaire, Bruxelles (BE)
Bibliographic Reference: Article: Nuclear Fusion, Vol. 31 (1991) No. 6, pp. 1067-1077
Record Number: 199111188 / Last updated on: 1994-12-02
Original language: en
Available languages: en