Electron Heating Using Lower Hybrid Waves in the PLT Tokamak PDF Download
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Languages : en
Pages : 14
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Author:
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Category :
Languages : en
Pages : 14
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Author: Victor L. Granatstein
Publisher: CRC Press
ISBN: 9782881240577
Category : Science
Languages : en
Pages : 524
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Category :
Languages : en
Pages : 8
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Category :
Languages : en
Pages :
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Order of magnitude improvements in the level and duration of current driven by lower hybrid waves have been achieved in the PLT tokamak. Steady currents up to 175 kA have been maintained for three seconds and 400 kA for 0.3 sec by the rf power alone. The principal current carrier appears to be a high energy (approx. 100 keV) electron component, concentrated in the central 20 to 40 cm diameter core of the 80 cm PLT discharge.
Author: Abraham Bers
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Category :
Languages : en
Pages : 21
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Category : Controlled fusion
Languages : en
Pages : 100
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Category :
Languages : en
Pages : 16
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Author:
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Category :
Languages : en
Pages : 13
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Results from tokamak experiments on direct electron interaction with the compressional Alfven wave ({open_quote}fast wave{close_quote}) are reviewed. Experiments aimed at electron heating as well as those in which fast wave electron current drive was investigated are discussed. A distinction is drawn between experiments employing the lower hybrid range of frequencies, where both the lower hybrid wave ({open_quote}slow wave{close_quote}) and the fast wave can propagate in much of the plasma, and those experiments using the fast wave in the range of moderate to high ion cyclotron harmonics, where only the fast wave can penetrate to the plasma core. Most of the early tokamak experiments were in the lower hybrid frequency regime, and the observed electron interaction appeared to be very similar to that obtained with the slow wave at the same frequency. In particular, electron interaction with the fast wave was observed only below a density limit nearly the same as the well known slow wave density limit. In the more recent lower frequency fast wave experiments, electron interaction (heating and current drive) is observed at the center of the discharge, where slow waves are not present.
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Category :
Languages : en
Pages : 31
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Languages : en
Pages :
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A simple quasilinear model was added of lower hybrid heating to the BALDUR 1-D tokamak transport code. The program was used to simulate PLT and the INTOR reactor design. For PLT a temperature increase of approx. = 2 keV/kW of RF input power was predicted. Quasilinear theory gave slightly less heating than linear theory, because of greater electron edge losses.
