Speaker
Ms
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
Ms
Maiko Yoshida
(Japan)
