LONG-PULSE ION INDUCTION LINAC

Important issues for the long-pulse induction ion accelerator are (1) the development of high-current long-pulse ion injectors, (2) a method for precise modulation of ion energy for longitudinal pulse compressi on, (3) core material selection of reasonable construction cost and si ze, and (4) a realistic scheme for the ion beam transport at low-beta region. At the present stage of our project, emphasis has been placed on the characterization of magnetic materials and the development of t he long pulse, high flux, low emittance ion injectors. For the precise voltage modulation and cost effective selection of magnetic cores, we measured the response of various ferromagnetic materials under fast-p ulse excitation. For the intense, long-pulse ion injectors, we propose drifting point-expanding plasma sources, which compress (smooth out) and expand (cool) the source plasma. These issues are discussed based on some experimental results. (C) 1998 Elsevier Science B.V. All right s reserved.