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アァカサザタダナハバパマヤャラワヮンイィキギシジチヂニヒビピミリウゥクグスズツヅッヌフブプムユュルエェケゲセゼテデヘベペメレオォコゴソゾトドノホボポモヨョロヲ ―

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1
Development of Fast Ferrite Tuner for ICRF Experiment of KSTAR Tokamak

sj Wang,B. G. Hong 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
All ICRF transmitters for the KSTAR tokamak are capable of generating 2 MW of RF power when the reflection power from the mismatching load is minimized. A coaxial FFT (Fast Ferrite Tuner) is being developed to match load conditions varying in millisecond time order. For a feasibility study, a reduced scale coaxial type FFT was constructed and tested. Conventional transmission line, solenoid coil and stacks of ferrite rings are arranged coaxially. Nd-YIG having low saturation magnetization is used to reduce the required range of external magnetic field to below 1 kGauss. The return loss of RF power was measured as fairly low and phase shifting was predictable within the range of frequency of interest. The low-loss range of magnetic field was found to be above 350 Gauss, depending on the RF frequency. It was attached as a pre-matching stub tuner for the helicon plasma source and showed reasonable matching capability for time varying loading reactance of the helicon antenna. The design concept and preliminary test results will be explained.