Speaker
Dr
Woochang Lee
(POSTECH)
Description
Mean apparent poloidal rotations of ion-scale density fluctuations in the laboratory frame were observed with the microwave imaging reflectometer (MIR) system in KSTAR ohmic and neutral beam (NB) heated L-mode plasmas. The estimated apparent poloidal velocities are 1-2 km/s at r/a ~ 0.5 in the electron diamagnetic direction for ohmic plasmas, and 8-10 km/s at r/a ~ 0.6 and 5-6 km/s at r/a ~ 0.7 in the ion diamagnetic direction for NB heated L-mode plasmas. For NB heated L-mode plasmas, the apparent poloidal velocities often deviate from the poloidally projected toroidal velocities of carbon ions and the difference is 2-3 km/s. Possible sources of the measured difference are under investigation including difference in toroidal velocity between the carbon and main deuterium ions.
| Country or International Organisation | Korea, Republic of |
|---|---|
| Paper Number | EX/P8-13 |
Primary author
Dr
Woochang Lee
(POSTECH)
Co-authors
Dr
Calvin W. Domier
(UC Davis)
Prof.
Gunsu Yun
(POSTECH)
Prof.
Hyeon K. Park
(UNIST)
Dr
J. H. Jeong
(NFRI)
Mr
June-Eok Leem
(POSTECH)
Prof.
Neville C. Luhmann
(UC Davis)
Dr
Won Ha Ko
(Korea, Republic of)
Dr
Yong Un Nam
(NFRI)
Dr
Young Soon Bae
(NFRI)
Dr
Young-Seok Park
(Columbia University)
Prof.
Young-chul Ghim
(KAIST)
