Accelerator component development for fusion material test device

Abstract Preparation of high current steady state ion source, fabrication of linac tanks by coating method, and development of high power high frequency power tube are described. The first one is the application of bombarded cathode to ion source with rather high operating pressure of 150 Pa, and the second is an application of coating technique primarily developed for tokamak divertor plate to linac cavity. Copper coating onto aluminium substrate is prepared and the measurements of the change of Q-value with coating thickness of 10 ∼ 30 μm is performed. The development of high power high frequency tube of 500 MHz frequency range for continuous operation is also described.