Development of long pulse ion induction linac

Important issues for development of high power ion induction accelerator are discussed based on some experimental results. For cost effective magnetic core selection, B-H characteristics of various ferromagnetic materials were evaluated as a function of magnetization rate. To stabilize the fluctuation of ion flux from a grid-controlled vacuum arc ion source, laser triggering was utilized. It can supply stable ion flux up to 10´s μ-sec level. For high current and long pulse ion injection of A (ampere)-μ sec level, a plasma-gun-type injector was also developed. A laser produced plasma is scheduled to be tested as a high flux point ion source of sub-μ sec pulse level