[Table of Contents]

Plasma and Fusion Research

Volume 7, 2403102 (2012)

Regular Articles

Analysis of Te/Ti Effect on Confinement Properties
Emi NARITA1), Tomonori TAKIZUKA1,2), Nobuhiko HAYASHI2), Takaaki FUJITA2), Shunsuke IDE2), Mitsuru HONDA2), Akihiko ISAYAMA2), Kiyoshi ITAMI2), Yutaka KAMADA2), Yasuyuki TANAKA1), Masaki IIDA1) and Takeshi FUKUDA1)
1)
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
2)
Naka Fusion Institute, Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
(Received 9 December 2011 / Accepted 31 May 2012 / Published 26 July 2012)

Abstract

In order to improve the prediction capability of confinement properties in burning plasmas with intensive electron heating, we have re-visited the DB3v10 International H-mode Confinement Database with emphasis on the temperature ratio Te/Ti and considerations on kinetic profiles. It was thereby found that the impact of Te/Ti is more apparent for discharges with peaked density profiles. Namely, HH factor improves with an increase of peakedness in the density profile for Te/Ti < 1, whereas it tends to deteriorate with the density peaking for Te/Ti > 1. The confinement scaling with a contribution of Te/Ti was also elaborated. In addition, the influence of Te/Ti described above was examined qualitatively with GS2 and GLF23 codes, which provided results corroborating the performed regression analysis, indicating the interplay of ITG and TEM in the turbulence transport.

Keywords

H-mode, burning plasma, confinement scaling law, Te/Ti ratio, GS2, GLF23, ITG, TEM

DOI: 10.1585/pfr.7.2403102

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This paper may be cited as follows:

Emi NARITA, Tomonori TAKIZUKA, Nobuhiko HAYASHI, Takaaki FUJITA, Shunsuke IDE, Mitsuru HONDA, Akihiko ISAYAMA, Kiyoshi ITAMI, Yutaka KAMADA, Yasuyuki TANAKA, Masaki IIDA and Takeshi FUKUDA, Plasma Fusion Res. 7, 2403102 (2012).