Application of the Two Stable Phases Phenomenon for Improvement of
the Longitudinal Stability in RFQ-like Funneling System
Valeri Kapin, Makoto Inoue, Yoshihisa Iwashita and Akira Noda
Accelerator Laboratory, Nuclear Science Research Facility,
Institute for Chemical Research, Kyoto University,
Gokanosho, Uji, Kyoto 611, JAPAN
The RFQ - like funneling concept by Stokes and Minerbo which can be used
at low beam energies are studied. It is proposed to modify it to improve
the longitudinal stability of the funneling beams. The results of
numerical simulations of the funneling concepts are presented. Due to our
modification the phase-width of output beams is reduced from 80deg to 35deg
The growth of the transverse size is decreased from 6mm to 2.5mm, while
the content of output beam within radius 0.5mm is increased from 50% to
almost 70%. The electrode shapes of the modified system are presented.
Here is the PostScript document.