Current Profile Modification During Lower Hybrid Current Drive in the Princeton Beta Experiment-Modification
Authors: R. Kaita, S. H. Batha, R. Bell, S. Bernabei, S. Hirshman, D. Ignat, S. Jardin, S. Jones, S. Kaye, J. Kesner, H. Kugel, B. LeBlanc, F. Levinton, S. Luckhardt, J. Manickam, M. Okabayashi, M. Ono, F. Paoletti, S. Paul, N. Sauthoff, S. Sesnic, H. Takahashi, W. Tighe, and S. von Goeler
Current profile modification with lower hybrid waves has been demonstrated in the Princeton Beta Experiment-Modification tokamak. When the n|| spectrum of the launched waves was varied, local changes in the current profile were observed according to equilibria reconstructed from motional Stark effect polarimetry measurements. Changes in the central safety factor (q) were also determined to be a function of the applied radio frequency (rf) power. These results have been modeled with the Tokamak Simulation Code/Lower Hybrid Simulation Code, which is able to duplicate the general trends seen in the data.