ICRF antenna matching systems with ferrite tuners for the Alcator C-Mod tokamak
Author(s)Lin, Yijun; Binus, Alan; Wukitch, Stephen James; Koert, Peter; Murray, Richard A; Pfeiffer, Andrew T; ... Show more Show less
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Real-time fast ferrite tuning (FFT) has been successfully implemented on the ICRF antennas on Alcator C-Mod. The former prototypical FFT system on the E-port 2-strap antenna has been upgraded using new ferrite tuners. A new FFT system with two ferrite tuners and one fixed-length stub has been installed on the transmission line of the D-port 2-strap antenna. These two systems are able to achieve and maintain the reflected power to the transmitters to less than 1% in real time under almost all plasma conditions and help ensure reliable high power operation of the antennas. The loading insensitivity feature vs. plasma conditions of the innovative field-aligned (FA) 4-strap antenna on the J-port allows us to significantly improve the matching by installing a carefully designed stub on each of the two transmission lines. The reduction of the RF voltages in the transmission lines has enabled the J-port FA antenna to deliver 3.7 MW RF power to plasmas out of 4 MW source power. The matching on the J-port antenna can be further improved by adding a single ferrite tuner under real-time control on each transmission line and this scheme will be implemented in the near future.
DepartmentMassachusetts Institute of Technology. Plasma Science and Fusion Center
Fusion Engineering and Design
Lin, Y. et al. “ICRF Antenna Matching Systems with Ferrite Tuners for the Alcator C-Mod Tokamak.” Fusion Engineering and Design 100 (November 2015): 239–248 © 2015 Elsevier B.V.
Author's final manuscript