@article{oai:repo.qst.go.jp:00045157, author = {Fujimoto, Tetsuya and Iwata, Souma and Shibuya, Shinji and Noda, Kouji and Shirai, Toshiyuki and Tongu, H and Noda, Akira and 野田 耕司 and 白井 敏之 and 野田 章}, issue = {3}, journal = {Nuclear Instruments & Methods in Physics Research Section A}, month = {Feb}, note = {For the investigation of free radicals with regards to cancer radiotherapy by ions, short-bunch formation followed by fast extraction was applied to a 7MeV proton beam at S-LSR after electron-beam cooling. Using phase rotation with an applied RF voltage of 800 V, a short-bunch with a duration of 3.1 ns at 2s was created for a beam intensity of 1.4E8, and fast extracted by a kicker magnet. Shortbunch formation by bunched cooling with a minimum bunch length of 15.7 ns at 2s was also carried out with an extraction efficiency of almost 100%.}, pages = {330--335}, title = {Formation and fast extraction of a very short-bunched proton beam for the investigation of free radicals}, volume = {588}, year = {2008} }