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Response of a resistive and rotating tokamak to external magnetic perturbations below the Alfven frequency

M.S. Chu ; L.L. Lao ; M.J. Schaffer ; T. Evans ; E.J. Strait ; Yueqiang Liu (Institutionen för rymd- och geovetenskap, Transportteori) ; M.J. Lanctot ; H. Reimerdes ; Yue Liu ; T. Casper ; Y. Gribov
Nuclear Fusion (0029-5515). Vol. 51 (2011), p. 073036.
[Artikel, refereegranskad vetenskaplig]

Motivated by the recent experimental observation that plasma stability can be improved by external magnetic perturbations, the general problem of plasma response to external magnetic perturbations is investigated. Different (vacuum, ideal and resistive) plasma response models are considered and compared. Plasma response, in experiments where stabilization was achieved, is obtained through computation using the MARS-F code, with a plasma model that includes both plasma resistivity and rotation. The resultant magnetic field line stochasticity is much reduced from that obtained formerly using the vacuum plasma model. This reduced stochasticity is more consistent with the favourable experimental observation of enhanced stability. Examples are given for the response of an ITER plasma to perturbations generated by the correction coils; and the response of a plasma to external coils (antenna) up to the Alfvén frequency.



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Denna post skapades 2011-12-14. Senast ändrad 2012-09-19.
CPL Pubid: 150066

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Transportteori (2010-2012)

Ämnesområden

Energi
Plasmafysik
Fusion

Chalmers infrastruktur