Publications (3)0 Total impact
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ABSTRACT: A new submillimeter wave gyrotron, called with Gyrotron FU VA, is now at an advanced stage of development which is being pured in collaboration among the FIR Research Center at Fukui University, the Institute for Plasma Research at the University of Stuttgart and the Institute for High Power Pulse and Microwave Technology at the Research Center in Karlsruhe (FZK). One of the main design goals of this device is to achieve a high purity mode output. For this reason, carefully designed resonant cavity has been developed and installed. Another objective is to attain a long-term operation by the use of an 8T He-free super-conducting magnet. Here, we summarize results of mode pattern measurements with the Gyrotron FUVA.
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ABSTRACT: A permanent magnet type gyrotron using 4th harmonics with over 100 GHz was investigated. Although the authors have already designed the basic magnetic circuit (C9 and C11 model), an improved magnetic circuit (C13 model) is investigated and finely tuned in order to manufacture the magnet circuit in practice. Also, the magnet circuit is controlled at the temperature of 30 C using rubber heater in order to hold a constant magnetic field distribution in spite of temperature changes. Good electron beam orbits were obtained in the improved model (C13) by simulation. So, the magnet circuit based on the improved model was manufactured. The obtained magnetic field strength and its distribution were well coincided to the calculated ones after the field adjustment. The electron beam orbits simulation based on the measured results showed good results.
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ABSTRACT: A millimeter wave IMPATT oscillator QI09425CK (Quinstar, 94GHz, 300mW) was used as an irradiation apparatus in order to study a basic of the irradiation on living bodies. The irradiation power of millimeter wave was measured by a water load power meter which was specially designed. To achieve a lower reflection of the irradiation wave, the seat of Teflon was placed between the waveguide vent and the sample. As the result, the denaturation of biological tissue using an IMPATT oscillator was obtained.
