Characteristics of a laser-produced proton beam improved by a synchronous RF field

同期した高周波により高品質化されたレーザー駆動陽子線の特性

脇田 明尚*; 岩下 芳久*; 白井 敏之*; 池上 将弘*; 頓宮 拓*; 想田 光*; 森 道昭; 余語 覚文; 織茂 聡; 西内 満美子; 小倉 浩一; 匂坂 明人; Ma, J.-L.; Pirozhkov, A. S.; 桐山 博光; 中井 善基; 下村 拓也; 田上 学*; 圷 敦; 岡田 大; 本村 朋洋*; 近藤 修司; 金沢 修平; 杉山 博則*; 大道 博行; 野田 章*

Wakita, Akihisa*; Iwashita, Yoshihisa*; Shirai, Toshiyuki*; Ikegami, Masahiro*; Tongu, Hiromu*; Soda, Hikaru*; Mori, Michiaki; Yogo, Akifumi; Orimo, Satoshi; Nishiuchi, Mamiko; Ogura, Koichi; Sagisaka, Akito; Ma, J.-L.; Pirozhkov, A. S.; Kiriyama, Hiromitsu; Nakai, Yoshiki; Shimomura, Takuya; Tanoue, Manabu*; Akutsu, Atsushi; Okada, Hajime; Motomura, Tomohiro*; Kondo, Shuji; Kanazawa, Shuhei; Sugiyama, Hironori*; Daido, Hiroyuki; Noda, Akira*

We have succeeded to compress the energy spread of a laser-produced proton beam to 1.6% at FWHM by an RF electric field synchronous to the pulse laser. Protons generated by this laser originally had a continuous energy spectrum with no peaks. Radial focusing and defocusing effects caused by the transverse component of the RF field were also observed. Concerning these effects, we simulated the energy spectra from the calculated value of the electric field by POISSON; the simulation could almost reproduce the experimental results. By applying this beam as an injection beam of a synchrotron, a compact acceleration system for particle cancer therapy is expected to be realized.