Plasma processes accompanying fast current decrease in the Tuman-3 tokamak
N V Sakharov; T Yu Akatova; L G Askinazi; W I Afanasiev; V V Bulanin; V E Golant; S G Goncharov; S V Krikunov; D O Korneev; A A Korotkov; B M Lipin; V B Minaev; K A Podushnikova; G T Razdobarin; V V Rozhdestvensky; V V Semenov; A S Tukachinsky; F V Chernyshev; S P Yaroshevich; N V Sakharov; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; T Yu Akatova; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; L G Askinazi; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; W I Afanasiev; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; V V Bulanin; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; V E Golant; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; S G Goncharov; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; S V Krikunov; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; D O Korneev; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; A A Korotkov; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; B M Lipin; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; V B Minaev; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; K A Podushnikova; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; G T Razdobarin; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; V V Rozhdestvensky; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; V V Semenov; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; A S Tukachinsky; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; F V Chernyshev; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia; S P Yaroshevich; A.F. Ioffe Phys. Tech. Inst., St Petersburg, Russia
Журнал:
Plasma Physics and Controlled Fusion
Дата:
1993-03-01
Аннотация:
The authors report an investigation of the influence of radial current distribution on the Tuman-3 tokamak plasma parameters under the conditions of ohmic heating with a twofold current decrease for a period 4-6 times shorter than the magnetic field diffusion time-scale. A slight change in the parameters was observed in the current ramp-down phase. The characteristic relaxation time of the plasma parameters after the current drop was considerably larger than the energy confinement time and comparable with the field diffusion time-scale. The influence of the current ramp-down on the boundary plasma is also studied. Narrowing of the current density profile is accompanied by a 1.5-2-fold rise of the energy confinement time compared with its steady-state value.
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