Spreading of wave-driven currents in a tokamak Page: 1 of 10

PPPL-3158 Preprint: January 1996 UC-420
D. W. Ignat, R. Kaita, S. C. Jardin, and M. Okabayashi
Plasma Physics Laboratory
Princeton University
P. O. Box 451
Princeton, New Jersey
USA 08543
ABSTRACT. Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification
(PBX-M) is computed with a dynamic model in order to understand an actual discharge aimed at raising the
central q above unity. Such configurations offer advantages for steady-state operation and plasma stability. For
the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current
density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid-driven current
and power using a diffusion-like equation and a velocity-independent diffusivity for fast-electron current brought
the model into reasonable agreement with the measurements if Dfat : 1.0 m2/s. Such a value for Dfast is in the
range suggested by other work.
PACS: 52.35.Fp 52.35.Hr 52.40.Db 52.50.Gj
January 4, 1996
This report was prepared as an account of work sponsored by an agency of the United States
Government. Neither the United States Government nor any agency thereof, nor any of their
employees, makes any warranty, express or implied, or assumes any legal liability or responsi-
bility for the accuracy, completeness, or usefulness of any information, apparatus, product, or
process disclosed, or represents that its use would not infringe privately owned rights. Refer-
ence herein to any specific commercial product, process, or service by trade name, trademark,
manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recom-
mendation, or favoring by the United States Government or any agency thereof. The views
and opinions of authors expressed herein do not necessarily state or reflect those of the
United States Government or any agency thereof.
1 DSR8TO FTI s1 L r

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Ignat, D. W.; Kaita, R.; Jardin, S. C. & Okabayashi, M. Spreading of wave-driven currents in a tokamak, report, January 1996; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc669912/m1/1/ocr/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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