Research and development on heavy-ion uniform-beam formation by nonlinear focusing

Yuri, Yosuke; Ishibori, Ikuo; Yuyama, Takahiro; Ishizaka, Tomohisa; Okumura, Susumu

In the past few years, the formation of a beam with a uniform transverse intensity distribution by means of nonlinear focusing of multipole magnets was explored using proton beams at the TIARA cyclotron. The successful experimental results have motivated us for further research and development (R&D) on the uniform-beam formation with heavy ions toward applications to material and biological research at TIARA. In order to conduct the R&D systematically with heavy-ion beams, a versatile experimental chamber was designed, fabricated and installed at the end of the LB course. In parallel with various activities to make the chamber available, an experimental beam study was also conducted using a few kinds of heavy ions.