MATCHING SECTION TO THE RFQ USING PERMANENT MAGNET SYMMETRIC LENS

M. Kando, M. Ikegami, H. Dewa, H. Fujita, T. Shirai, H. Okamoto, Y.Iwashita, S. Kakigi, A. Noda and M. Inoue
Nuclear Science Research Facility, Institute for Chemical Research, Kyoto University
Gokanosho, Uji, Kyoto 611 JAPAN

Abstract

Permanent magnet symmetric (PMS) lens is considered as the final focusing element for the RFQ linac at ICR. The PMS lens, which produces strong axial magnetic field like a solenoid lens, is composed of radially magnetized permanent magnet rings. Because of the low injection energy ( 50 keV) and a relatively high beam current intended (20 mA), space-charge effects should be taken into account. The beam tracking code PARMSYL is developed for the purpose, which first reads an output file (TAPE35) from PANDIRA for the PMS field and then numerically integrates the equation of motion including the space-charge force The matching section to the RFQ is designed using this code and TRACE-3D.
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kando@kyticr.kuicr.kyoto-u.ac.jp