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A gyrotron and a waveguide transmission line, which were developed for electron cyclotron heating and current drive in JT-60SA, have been tested to evaluated its high-power, long-pulse and multi-frequency capabilities. High-power oscillations up to 1.8 MW at 110 GHz and 1.3 MW at 138 GHz have been obtained so far. The spatial distribution of the temperature increase of the waveguide transmission line...
High-power, long-pulse operations of a gyrotron for JT-60SA (Super-Advanced) have been carried out at 110 GHz (1 MW/100 s) and 138 GHz (1 MW/100 s). These results fully satisfied the requirements of the electron cyclotron heating and current drive (ECH/CD) system in JT-60SA. It was experimentally shown that the higher power operation at each frequency is expected to be acceptable for this gyrotron...
Long pulse operation of a dual frequency gyrotron for JT-60SA, which can oscillate both 110 GHz and 138 GHz waves, was started. Oscillations at ∼ 0.4 MW for 2 s (both frequencies) and 0.7 MW for 1 s (110 GHz) were obtained, so far. Temperature increase in the cavity, the output window and some components, which absorb stray radiation in the gyrotron, were measured and cavity loss power and the dielectric...
A new dual frequency (110 GHz and 138 GHz) gyrotron development began for JT-60SA. An output power and efficiency higher than 1 MW and 30% with a peak heat load lower than 1.4 kW/cm2 were obtained for both frequencies in calculation. High mode conversion efficiencies of the quasi-optical mode converter (96.8% for 110GHz and 98.3% for 138GHz), which is higher than the previously developed 110 GHz long...
A fast calculation method for parametric survey is needed when designing motors. We propose a new method for analyzing the harmonic components of air-gap flux density distribution in three-phase wound rotor induction motors. The proposed method is based on analytical equations for permeance and magnetomotive force distribution, considering the influence of the circumference slot arrangement and winding...
Tne JT-60U gyrotron has a triode electron gun, which enables to control its oscillation output by adjusting its anode voltage. The output was successfully recovered by anode voltage control when it was terminated. Moreover, the output was modulated at 0.7 MW up to 500 Hz with modulation factor 80 %.
Compatibility of a low activation ferritic steel, F82H, with plasma has been investigated in the JFT-2M tokamak with three stages. The tokamak experiments in the third stage have just started, where the vacuum vessel is fully covered with the ferritic steel. Prior to the tokamak experiment, vacuum properties of F82H were investigated using a test-stand. The outgas rate is less than 6x10 - ...
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