High-resolution beam energy-spread measurements using combination of nuclear resonant reactions and a 0 beam line separation

Ishii, Yasuyuki; Chiba, Atsuya; Uno, Sadanori; Saito, Yuichi; Mizuhashi, Kiyoshi; Tajima, Satoshi*; Kamiya, Tomihiro

Measurement of beam energy spreads caused by an accelerator are needed to evaluation the choromatic aberration when ion beams with micorometer or nanometer sizes are formed at a focusing point. A measurement method of the beam energy spreads without using a analyzing magnet with a high resolution was developed to evaluate the chromatic aberration in a light-ion micorbeam system connected to the 3MV JAEA single-ended accelerator. The accurate beam energy spread measurement method within a resolution of 10 was developed using resonance nuclear reactions with narrow energy spreads of A(p,)Si and Mg(p,)A in a MeV energy range. Furthermore, ion species separating method, in a 0-degree beam line connected to the accelerator, was developed using parmanent magnets attached on the accelerator tube in the accelerator. The two kinds of developmet resulted in measuring baem energy spreads generated from the accelerator directly.