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Title: ICRF antenna matching systems with ferrite tuners for the Alcator C-Mod tokamak

Abstract

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.

Authors:
; ; ; ; ;
Publication Date:
DOE Contract Number:  
FC02-99ER54512
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1881470
DOI:
https://doi.org/10.7910/DVN/NZMGER

Citation Formats

Lin, Y., Binus, A., Wukitch, S. J., Koert, P., Murray, R., and Pfeiffer, A. ICRF antenna matching systems with ferrite tuners for the Alcator C-Mod tokamak. United States: N. p., 2020. Web. doi:10.7910/DVN/NZMGER.
Lin, Y., Binus, A., Wukitch, S. J., Koert, P., Murray, R., & Pfeiffer, A. ICRF antenna matching systems with ferrite tuners for the Alcator C-Mod tokamak. United States. doi:https://doi.org/10.7910/DVN/NZMGER
Lin, Y., Binus, A., Wukitch, S. J., Koert, P., Murray, R., and Pfeiffer, A. 2020. "ICRF antenna matching systems with ferrite tuners for the Alcator C-Mod tokamak". United States. doi:https://doi.org/10.7910/DVN/NZMGER. https://www.osti.gov/servlets/purl/1881470. Pub date:Wed May 20 00:00:00 EDT 2020
@article{osti_1881470,
title = {ICRF antenna matching systems with ferrite tuners for the Alcator C-Mod tokamak},
author = {Lin, Y. and Binus, A. and Wukitch, S. J. and Koert, P. and Murray, R. and Pfeiffer, A.},
abstractNote = {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.},
doi = {10.7910/DVN/NZMGER},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {5}
}

Works referencing / citing this record:

ICRF antenna matching systems with ferrite tuners for the Alcator C-Mod tokamak
journal, November 2015