@article{oai:repo.qst.go.jp:00046158,
 author = {Wakita, Akihisa and Iwashita, Yoshihisa and Shirai, Toshiyuki and Ikegami, Masahiro and Tongu, H and Souda, Hikaru and Noda, Akira and et.al and 岩下 芳久 and 白井 敏之 and 想田 光},
 issue = {1},
 journal = {Nuclear Instruments & Methods in Physics Research Section A},
 month = {Feb},
 note = {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 inject ion beam of a synchrotron,a compact acceleration system for particle cancer therapy is expected to be realized.},
 pages = {15--19},
 title = {Characteristics of a laser-produced proton beam improved by a synchronous RF field},
 volume = {599},
 year = {2009}
}