SCRAPE-OFF LAYER CURRENT IN DIVERTED TOKAMAKS

Authors
KESNER J RAMOS JJ LUCKHARDT SC
Citation
J. Kesner et al., SCRAPE-OFF LAYER CURRENT IN DIVERTED TOKAMAKS, Nuclear fusion, 34(6), 1994, pp. 795-801
Citations number
23
Categorie Soggetti
Phsycs, Fluid & Plasmas","Physics, Nuclear
Journal title
Nuclear fusion → ACNP
ISSN journal
00295515
Volume
34
Issue
6
Year of publication
1994
Pages
795 - 801
Database
ISI
SICI code
0029-5515(1994)34:6<795:SLCIDT>2.0.ZU;2-E
Abstract
A negative current in the scrape-off region beyond the separatrix of a diverted tokamak can improve its MHD stability. By utilizing a strong thermionic emitter a current of up to 25 % of the plasma current can be driven in the scrape-off region. If the thermionic current is emitt ed at only one end of the open field lines, a current will flow in the absence of a potential bias. The heat to maintain the electron emissi on that drives the scrape-off current would be supplied by the plasma outflow and no additional power is needed.