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Abstract

Ion Cyclotron Resonance Heating (ICRH) powers of up to 17 MW have been coupled to JET limiter plasmas. The plasma stored energy has reached 7 MJ with 13 MW of RF in 5 MA discharges with Z(eff) = 2. The stored energy can be 50% greater than the Goldston L mode scaling. This is due to transient stabilisation of sawteeth (up to 3 s) and to a significant energy content in the minority particles accelerated by RF (up to 30% of the total stored energy). Central temperatures of T(e) = 11 keV and T(i) = 8 keV have been reached with RF alone. {HE(3)}D fusion experiments have given a 60 kW fusion yield (fusion rate of 2 x 1.0 E16 /s in the form of energetic fast particles (14.7 MeV(H), 3.6 MeV(HE(4))) in agreement with modelling. When transposing the same calculation to a (D)T scenario, Q is predicted to be between 0.2 and 0.8 using plasma parameters already achieved. For the first time, a peaked density profile generated by pellet injection could be reheated and sustained by ICRF for 1.2 s. Electron heat transport in the central region is reduced by a factor 2 to 3. The fusion product n(io)t(E)T(io) reaches 2.2 x 1.0 E+20 /m3.s.kev in 3MA discharges which is a factor of 2 or 3 times larger than with the normal density profile.

Additional information

Authors: THE JET TEAM, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(88)40 EN (1988)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 198910344 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en