Enhanced current drive efficiency in a long discharge on TRIAM-1M

Authors
Hanada, K Itoh, S Nakamura, K Zushi, H Sakamoto, M Jotaki, E Pan, YD Hasegawa, M Kawasaki, S Nakashima, H
Citation
K. Hanada et al., Enhanced current drive efficiency in a long discharge on TRIAM-1M, NUCL FUSION, 41(11), 2001, pp. 1539-1542
Citations number
15
Categorie Soggetti
Physics
Journal title
NUCLEAR FUSION
ISSN journal
00295515 → ACNP
Volume
41
Issue
11
Year of publication
2001
Pages
1539 - 1542
Database
ISI
SICI code
0029-5515(200111)41:11<1539:ECDEIA>2.0.ZU;2-N
Abstract
The enhanced current drive (ECD) efficiency mode, which is characterized by a spontaneous increase of current drive efficiency eta (CD) from (0.3-0.4) x 10(19) A/W m(-2) to (0.6-1.0) x 10(19) A/W M-2, is observed in long pure LHCD plasmas on TRIAM-1M. The energy confinement time is also improved due to the increase of line averaged electron density, and of the ion and elec tron temperatures. The current drive efficiency is proportional to the elec tron density. The transition to ECD mode occurs at a critical density, whic h depends slightly on the refractive index in the toroidal direction N-para llel to of the injected wave.