Nonadiabatic Energy Transfer between Coupled L-C Resonators and Its Possible Applications to High-Power RF Pulse Generation

概要

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A new principle of high-power RF pulse generation available in nuclear fusion research is proposed. The RF energy stored in L-C resonators with variable resonant frequencies is transferred to a load resonator when the frequency crossing occurs. Successive energy transfers from resonators result in a sustained RF oscillation at the load. It is emphasized that the successive triggering is not required in the present method. This simplifies substantially the operation of the RF generators. The principle is analyzed and numerically calculated for practical experimental conditions. An example of the conceptual designs of the variable inductor used in the present method is shown. At the frequency 1 MHz (4 MHZ), the output 110 kW (440 kW) and the pulse width 24 μsec (6 μsec) are expected, if one uses two toroidal ferrite cores with a major radius 0.5m and a minor radius 0.2m. The attainable RF powers are limited, because of the limited RF energy density stored in the ferrite cores. Moreover, it is found that the overall efficiency of the resonator is considerably low. Nevertheless, we expect, the present method offers a handy and convenient high-power RF pulse generator with output of hundreds of kW which are available to ion cyclotron resonant heating, RF plugging and/or dynamic stabilization of large scale high-temperature plasmas.
核融合科学研究所の論文