Fokker-Planck calculations for JET ICRF heating scenarios

Abstract

Flux-averaged ICRF heating of the JET tokamak is considered, utilizing an anisotropic, time-dependent Fokker-Planck code. Alternative ICRF heating scenarios are considered, and fundamental minority deuterium and second-harmonic tritium and deuterium cases are selected for detailed analysis of wave accessibility, strong single-pass damping and enhanced ion-tail-produced fusions. It is found that enhanced fusions, resulting from heated minority deuterium ion tails, and second-harmonic deuterium heating, yielding fusion power gains near Q = 1, can be achieved near the plasma core with moderate absorbed power levels, pulse widths and energy confinement times. The corresponding case for second-harmonic tritium heating located on the major axis, with the associated fusion power gain, does not appear as attractive.

Analysis of second harmonic ICRF waves in NBI heated JT-60 plasmas

“…The effects of the loss term L E are discussed in Ref. [17]. We are interested in the stationary state, i.e.…”

An analysis of the folded waveguide: a compact waveguide launcher for ICRF heating

“…INDUCTIVE STRIPS AND APERTURES IN A FOLDED WAVEGUIDE As mentioned in the introduction, ICRF heating requires coupling to the fast magnetosonic wave in a plasma. In a typical magnetic-confinement fusion device, this entails the launching of fast magnetosonic waves with an electric field E, that is perpendicular to the static magnetic field and has a left circularly polarized component at the core that heats the plasma [9]. In the folded waveguide, however, the electric field continuously alters direction as one proceeds around the channels of the waveguide's cross section.…”

Possibilities for breakeven and ignition of D-3He fusion fuel in a near term tokamak

“…The concept of ICRF enhanced fusion Q (fusion power out/auxiliary power in) was first examined by Scharer et al [27] for a modest ICRF power level near breakeven for D-T operation in JET. It was found that minority deuterium, fundamental ion resonance, non-Maxwellian tail heating produced fusion Q enhancements of factors of two compared with a Maxwellian equivalent.…”