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Preliminary experiments were carried out in JET using 120 keV helium neutral beam injection (NBI). Injected power levels up to 5 MW with 3He and 7 MW with 4He, lasting up to 3 s, were reached. The 3 s helium NBI produced efficient ion heating and similar global and local energy confinements to those obtained with deuterium NBI, in both limiter and X-point plasma geometries, in L-mode and H-mode plasma regimes. The elimination of beam-plasma and beam-beam fusion reactions by replacing D NBI with He NBI extended the range for measuring ion temperatures with the JET neutron profile monitor and neutron spectrometers.

Additional information

Authors: MARCUS F B ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(92)11 (1992) 14 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199210762 / Last updated on: 1994-12-02
Original language: en
Available languages: en