@misc{oai:repo.qst.go.jp:00067101,
 author = {福田, 祐仁 and 金崎, 真聡 and 神野, 智史 and ピロジコフ, アレキサンダー and 匂坂, 明人 and 小倉, 浩一 and 宮坂, 泰弘 and 中新, 信彦 and 宇野, 雅貴 and 高野, 雄太 and 森井, 厚作 and 浅井, 孝文 and 坂本, 渓太 and 清水, 和輝 and 森島, 邦博 and 小平, 聡 and 岡本, 祐樹 and 松井, 隆太郎 and 岸本, 泰明 and 小田, 啓二 and 山内, 知也 and 上坂, 充 and 近藤, 公伯 and 河内, 哲哉 and 神門, 正城 and 桐山, 博光 and 福田 祐仁 and ピロジコフ アレキサンダー and 匂坂 明人 and 小倉 浩一 and 宮坂 泰弘 and 中新 信彦 and 宇野 雅貴 and 高野 雄太 and 森井 厚作 and 浅井 孝文 and 坂本 渓太 and 清水 和輝 and 小平 聡 and 岡本 祐樹 and 松井 隆太郎 and 近藤 公伯 and 河内 哲哉 and 神門 正城 and 桐山 博光},
 month = {Jun},
 note = {Laser-driven ion acceleration has been one of the most active areas of research over approximately the past decade, because accelerated multi-MeV ion beams have unique properties that can be employed in a broad range of applications including nuclear science, hadron cancer therapy, and fast ignition for inertial confinement fusion. The recent advancements in laser-driven ion acceleration techniques using thin foil targets allow the maximum proton energies close to 100 MeV. From a view point of practical applications, high-purity proton beams with high reproducibility are quite advantageous. In experiments using thin foil targets, however, protons from surface contaminants along with the high-z component materials are accelerated together, making the production of impurity-free proton beams unrealistic. 
Here we introduce a micron-size hydrogen cluster, composed of 10^8-10 hydrogen molecules, as a target to generate impurity-free, highly-reproducible, and robust multi-MeV proton beams. Because of the recent progress in intense laser technology, the advanced PW class lasers can now achieve intense laser fields around 10^22 W/cm^2; with such fields, all the electrons inside the micron-size hydrogen cluster up to 3.0 μm in diameter can be fully stripped off, resulting in a pure Coulomb explosion with a pronounced increase in accelerated maximum proton energies scaled as Emax = 276(d/2)2 MeV, where d is a diameter of clusters. For example, 100 MeV protons could be produced via the Coulomb explosion of the 1.2 μm diameter hydrogen cluster when irradiated by a laser pulse with a peak intensity of 1.6 × 10^21 W/cm^2. The robust nature of the Coulomb explosion mechanism offer an additional advantage for practical applications., 第34回化学反応討論会},
 title = {Generation of high-repetitive, multi-MeV, pure proton beams via Coulomb explosion of micron-size hydrogen clusters},
 year = {2018}
}