Impact of bulk non-Maxwellian electrons on electron temperature measurements (invited)
作者： E. de la Luna , V. Krivenski , G. Giruzzi , C. Gowers , R. Prentice
DOI: 10.1063/1.1538354
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摘要: In neutral beam injection and ion cyclotron resonance frequency (NBI+ICRF) heated high-temperature Joint European Torus (JET) plasmas, electron emission (ECE) spectra measured by the Michelson interferometer are inconsistent with bulk distribution being Maxwellian. This conclusion follows from new, accurate modeling of ECE over full range, covering first four harmonics frequency. A model function obtained fitting a spectrum reveals distortion Maxwellian that is sharply localized at ∼1.5×thermal momentum. consequence deduced this temperature JET’s Thomson scattering diagnostic, which weighs electrons differently, should be lower than one in spatial region where exists. prediction appears to confirmed profile comparisons showing core temperatures on JET up 20% values for plasmas strong NBI+ICRF heating. The possibility addressing experimentally question whether plasma has also discussed. goal can accomplished observing different angles respect magnetic field (oblique ECE). Simulations oblique using previously show an angular variation characteristic distorted bulk.
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