Transient transport analysis of improved confinement plasmas in LHD

K. Ida, S. Inagaki, R. Sakamoto, N. Tamura, K. Tanaka, H. Funaba, S. Morita, Y. Takeiri, K. Ikeda, T. Shimozuma, S. Kubo, C. Michel, T. Tokuzawa, O. Kaneko, A. Komori, O. Motojima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The transient transport analysis applied to the improved modes in LHD clearly show a bifurcation characteristics both in the inner and outer region of the plasma. The transient bifurcation of transport appears in the inner region of the plasma (r < a/2) after the TESPEL injection as a drop of heat flux associated with the spontaneous rise of electron temperature. in the with ITB and also outer region of the plasma in the pellet enhanced mode. The region where the bifurcation appears is consistent with the region where the ITB appears. The other bifurcation between gyro-Bhom transport and a weak temperature dependent transport is observed after the repetitive pellet injection in the outer region of the plasma [r > (2/3)a]. The time trace of heat flux and temperature gradient shows a negative transient thermal diffusivity, which is a clear evidence of bifurcation of transport.

Original languageEnglish
Title of host publication32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts
Pages45-48
Number of pages4
Publication statusPublished - Dec 1 2005
Externally publishedYes
Event32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets - Tarragona, Spain
Duration: Jun 27 2005Jul 1 2005

Publication series

Name32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts
Volume1

Other

Other32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets
CountrySpain
CityTarragona
Period6/27/057/1/05

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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