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Abstract

In order to perform plasma-refuelling experiments with cryogenic hydrogen pellets at the midsize tokamak ASDEX Upgrade, a centrifuge injector was developed based on the novel stop cylinder principle. Following the demonstration of excellent performance with this instrument, similar injectors were constructed for two of the world's largest tokamaks, JET and JT-60U. The extended fuel consumption in these tokamaks enforced the employment of continuous extruders instead of a storage cryostat, requiring an increase in pellet temperature from 8 to 14 K. Degradation of the injector performance was found at these higher pellet temperatures due to increased gas evaporation rates but could be eliminated by a revised acceleration scheme. Applying the adapted set-up, reliable and stable operation has been realized with JET and JT -60U injectors.

Additional information

Authors: LANG P, Max-Plank-Institut fur Plasmaphysik,EURATOM-Association, Boltzmannstrasse 2, D-85748 Garching (DE);CIERPKA P, Max-Plank-Institut fur Plasmaphysik,EURATOM-Association, Boltzmannstrasse 2, D-85748 Garching (DE);HORTON L, Max-Plank-Institut fur Plasmaphysik,EURATOM-Association, Boltzmannstrasse 2, D-85748 Garching (DE);LORENZ A, Max-Plank-Institut fur Plasmaphysik,EURATOM-Association, Boltzmannstrasse 2, D-85748 Garching (DE);WATSON M, JET Joint Undertaking, Abingdom, Oxfordshire (UK);TWYNAM P, JET Joint Undertaking, Abingdom, Oxfordshire (UK);WALDEN A, JET Joint Undertaking, Abingdom, Oxfordshire (UK);WIJETUNGE S, JET Joint Undertaking, Abingdom, Oxfordshire (UK);WILLIS B, JET Joint Undertaking, Abingdom, Oxfordshire (UK);HOSOGANE N, JAERI, Naka Fusion Research Establishment, Ibaraki-ken (JP);HIRATSUKA H, JAERI, Naka Fusion Research Establishment, Ibaraki-ken (JP);KIZU K, JAERI, Naka Fusion Research Establishment, Ibaraki-ken (JP)
Bibliographic Reference: Article: Review of Scientific Instruments, Vol. 71 (2000), No. 10, pp. 3744-3746
Record Number: 200013114 / Last updated on: 2001-02-20
Category: PUBLICATION
Original language: en
Available languages: en