Development of V_p×B Electron Linear Accelerator utilizing Transverse Electromagnetic Wave

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The goal of this project is to develop a more compact electron linear accelerator with V_p×B acceleration scheme utilizing X-band microwave (9 GHz). We need to design a slow-wave structure for X-band V_p×B accelerator. We heve made the prototype slow-wave structure by using approximate equations, because no design method of it was found, to our best knowlege. It has been confirmed experimentally that the V_p×B electron linac has the better acceleration rate in the X-band microwave range, though the experiments have not been performed perfectly. Thus, a possibility of more compact electron linac has been shown. Because the high power microwave source for the accelerator has broken down at the beginning of this year, we have not completed our goal. The transmission rate of the X-band microwave through the accelerator is too small to obtain large increment of energy gain estimated from the microwave power 250 kW, because of the disagreement of the resonance frequency between the mode converter and the slow-wave structure. At present, a new slow-wave structure together with the mode converter is underway.In addition, we have developed a proton source (〜30 keV) for the study of a new compact proton accelerator. In order to accelerate protons with energy 30 keV extracted from the proton source up to 1 MeV, we have been designing IH(Interdigital H) linear accelerator as the injector to the final stage of the accelerator using laser and plasma. We plan to make prototype after finishing the design of the accelerator cavity.