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Local magnetic divertor for control of the plasma-limiter interaction in a tokamak

Zweben, S. J. and Liewer, P. C. and Gould, R. W. (1984) Local magnetic divertor for control of the plasma-limiter interaction in a tokamak. Physics of Fluids, 27 (3). pp. 691-703. ISSN 0031-9171. doi:10.1063/1.864678.

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An experiment is described in which plasma flow to a tokamak limiter is controlled through the use of a local toroidal divertor coil mounted inside the limiter itself. This coil produces a local perturbed field B_C approximately equal to the local unperturbed toroidal field B_T ≃ 3 kG, such that when B_C adds to B_T the field lines move into the limiter and the local plasma flow to it increases by a factor as great as 1.6, and when B_C subtracts from B_T the field lines move away from the limiter and the local plasma flow to it decreases by as much as a factor of 4. A simple theoretical model is used to interpret these results. Since these changes occur without significantly affecting global plasma confinement, such a control scheme may be useful for optimizing the performance of pumped limiters.

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Additional Information:© 1984 American Institute of Physics. Received 14 January 1983; accepted 5 December 1983. We thank J. A. Rome, R. Fowler, V. Lynch, and M. Peng for help in using the Oak Ridge National Laboratory magnetic field line codes. This work was supported by the U.S. Department of Energy, under Contract No. DE-AS03-SF00767.
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Department of Energy (DOE)DE-AS03-SF00767
Subject Keywords:tokamak devices; plasma drift; magnet coils; magnetic fields; disturbances; plasma confinement; optimization; performance; limiters; divertors; control; toroidal configuration
Issue or Number:3
Classification Code:PACS: 52.55.Fa; 52.55.Hc; 52.55.Jd
Record Number:CaltechAUTHORS:20120703-111751046
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Official Citation:Local magnetic divertor for control of the plasma--limiter interaction in a tokamak S. J. Zweben, P. C. Liewer, and R. W. Gould, Phys. Fluids 27, 691 (1984), DOI:10.1063/1.864678
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32254
Deposited By: Aucoeur Ngo
Deposited On:03 Jul 2012 18:31
Last Modified:09 Nov 2021 21:26

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