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,
Gokanosho, Uji, Kyoto 611 JAPAN
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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