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Oct 13 – 18, 2014
Hotel Park Inn Pribaltiyskaya
Europe/Moscow timezone

Response of Ion and Electron Temperatures, Electron Density and Toroidal Rotation to Electron Cyclotron Heating in JT-60U

Oct 16, 2014, 2:20 PM
20m
Blue 1-5 (Hotel Park Inn Pribaltiyskaya)

Blue 1-5

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation

Speaker

Mr Maiko Yoshida (Japan)

Description

Temporal and spatial responses of the electron and ion temperatures (Te and Ti), the electron density (ne), and the toroidal rotation velocity (Vφ) with electron cyclotron heating (ECH) have been clarified for the first time with fast measurements in positive shear (PS) H-mode plasmas, weak shear (WS) plasmas with internal transport barriers (ITBs) and reversed shear (RS) plasmas with ITBs on JT-60U. We have found that: (i) Ion temperature inside the steep Ti gradient decreases with ECH after the Te increase in PS and WS plasmas. The Ti reduction can be avoided with a large Vφ shear (dVφ/dr) that easily forms in RS plasmas. (ii) Electron density with peaked ne profile decreases with ECH after the Te increase. (iii) Counter intrinsic rotation is generated after the Te increase and increases with the Te increase. Time scale of the Vφ change is much longer than that of the Te increase [1]. The observations in the ne, Ti and Vφ in PS plasmas are consistently explained by theoretical models and gyrokinetic (GK) calculations.
Country or International Organisation Japan
Paper Number EX/6-2

Primary author

Mr Maiko Yoshida (Japan)

Co-authors

Dr Hajime Urano (JAEA) Dr Hidenobu Takenaga (Japan Atomic Energy Agency) Dr Mitsuru Honda (Japan Atomic Energy Agency) Dr Motoki Nakata (Japan Atomic Energy Agency) Dr Naoaki Miyato (Japan Atomic Energy Agency) Dr Shunsuke Ide (Japan Atomic Energy Agency) Dr Takayuki Kobayashi (Japan Atomic Energy Agency) Dr Yutaka Kamada (Japan Atomic Energy Agency)

Presentation materials