Lower-hybrid and Fast Alfvén Wave Current Drive PDF Download
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Author: Abraham Bers
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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Author: Abraham Bers
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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Author: Abhay Ram
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Category :
Languages : en
Pages : 8
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Author: J. E. Stevens
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Category :
Languages : en
Pages : 15
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Author:
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Category :
Languages : en
Pages :
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Fast wave current drive is demonstrated in the Princeton ACT-I toroidal device. The fast Alfven wave, in the range of high ion-cyclotron harmonics, produced 40 A of current from 1 kW of rf power coupled into the plasma by fast wave loop antenna. This wave excites a steady current by damping on the energetic tail of the electron distribution function in the same way as lower-hybrid current drive, except that fast wave current drive is appropriate for higher plasma densities.
Author:
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ISBN:
Category :
Languages : en
Pages : 10
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Author:
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Category :
Languages : en
Pages : 10
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Author: United States. Department of Energy. Division of Magnetic Confinement Systems
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Category : Fusion reactors
Languages : en
Pages : 124
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Category : Controlled fusion
Languages : en
Pages : 160
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Author:
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Category :
Languages : en
Pages : 4
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One method of radio-frequency heating which shows theoretical promise for both heating and current drive in tokamak plasmas is the direct absorption by electrons of the fast Alfven wave (FW). Electrons can directly absorb fast waves via electron Landau damping and transit-time magnetic pumping when the resonance condition [omega] - [kappa]{sub {parallel}e}[upsilon]{sup {parallel}e} = O is satisfied. Since the FW accelerates electrons traveling the same toroidal direction as the wave, plasma current can be generated non-inductively by launching FW which propagate in one toroidal direction. Fast wave current drive (FWCD) is considered an attractive means of sustaining the plasma current in reactor-grade tokamaks due to teh potentially high current drive efficiency achievable and excellent penetration of the wave power to the high temperature plasma core. Ongoing experiments on the DIII-D tokamak are aimed at a demonstration of FWCD in the ion cyclotron range of frequencies (ICRF). Using frequencies in the ICRF avoids the possibility of mode conversion between the fast and slow wave branches which characterized early tokamak FWCD experiments in the lower hybrid range of frequencies. Previously on DIII-D, efficient direct electron heating by FW was found using symmetric (non-current drive) antenna phasing. However, high FWCD efficiencies are not expected due to the relatively low electron temperatures (compared to a reactor) in DIII-D.
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Category : Power resources
Languages : en
Pages : 780
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