AbSmi-Over 55kV/p, high voltage r k u p rated pulses have been sucegFfuDy applied betweeu the anode to the cathode of the 4kVBOOA Static Induction Thyristor (SlThy) at t u m 4 actions by applying the Induction Energy Storage 0 eimCit invented in 2002 111. SlThys were bmken d e n the high dv/dt value, over 2kV/p, is applied f o m r d between the anode and tbe cathode at the tum-off action by the conventional opening switching technique. We simulated the electric field SbpngU~ inside of the SlThy on the IES eirmit; consequently the electric field applied in front of the wmitter at the tum-off action b absolutely low. lhis is consided to be the Fesson of the high tolerance for "tum-off dvldt" of SlTbys ou the IES c h i t .

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A tabletop micro X-ray beam irradiation system has been developed to research radiation effects on living cells. The microbeam system is composed of a micro focus X-ray tube, a capillary for X-ray guide, an X-ray semiconductor detector for fluorescent X-ray analysis and an inverted microscope. A beam profile measurement was performed and the size of the focused beam was 10 μm in diameter (FWHM) with the divergence of 5.1 mrad. The data on the microbeam measurement was approximately agreement with a simulation of X-ray optical traces for the designed capillary. In addition, the microdosimetric characterization for the single cell irradiation was performed with the beam profile measurement and a photon-electron transport simulation. The maximum of the dose rate for the sample cells set in the system was estimated to be 0.05 Gy/s. In a preliminary experiment, single yeast cell was irradiated with the X-ray microbeam, and the data on the survival rate of the cell samples for the X-ray doses was obtained. Then, the microbeam irradiation system is useful to research the radiation effects to the living cells.

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