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Modeling of ultra-cold and crystalline ion beams

岡本 宏巳*; 杉本 寛*; 百合 庸介; 池上 将弘*; Wei, J.*

Proceedings of 10th International Computational Accelerator Physics Conference (ICAP 2009) (Internet), p.151 - 156, 2009/08

An ultimate goal in accelerator physics is to produce a "zero-emittance" beam, which is equivalent to making the beam temperature the absolute zero in the center-of-mass frame. At this limit, if somehow reached, the beam is Coulomb crystallized. Schiffer and co-workers first applied the molecular dynamics (MD) technique to study the fundamental features of various Coulomb crystals. Their pioneering work was later generalized by Wei et al. who explicitly incorporated discrete alternating-gradient lattice structures into MD simulations. This talk summarizes recent numerical efforts made to clarify the dynamic behavior of ultra-cold and crystalline ion beams. The MD modeling of beam crystallization in a storage ring is outlined, including how one can approach the ultra-low emittance limit. Several possible methods are described of cooling an ion beam with radiation pressure (the Doppler laser cooling).


Application of laser-accelerated protons to the demonstration of DNA double-strand breaks in human cancer cells

余語 覚文; 佐藤 克俊; 錦野 将元; 森 道昭; 手島 昭樹*; 沼崎 穂高*; 村上 昌雄*; 出水 祐介*; 赤城 卓*; 永山 伸一*; et al.

Applied Physics Letters, 94(18), p.181502_1 - 181502_3, 2009/05

 被引用回数:102 パーセンタイル:94.73(Physics, Applied)

We report the demonstrated irradiation effect of laser-accelerated protons on human cancer cells. ${it In-vitro}$ (living) A549 cells are irradiated with quasi-monoenergetic proton bunches of 0.8-2.4 MeV with a single bunch duration of 15 ns. Irradiation with the proton dose of 20 Gy results in a distinct formation of $$gamma$$-H2AX foci as an indicator of DNA double-strand breaks generated in the cancer cells. This is a pioneering result in view of future investigations on the radiobiological effects of laser-driven ion beams. Unique high-current and short-bunch features make laser-driven proton bunches an excitation source for time-resolved determination of radical yields.


Focusing and spectral enhancement of a repetition-rated, laser-driven, divergent multi-MeV proton beam using permanent quadrupole magnets

西内 満美子; 大東 出; 池上 将弘; 大道 博行; 森 道昭; 織茂 聡; 小倉 浩一; 匂坂 明人; 余語 覚文; Pirozhkov, A. S.; et al.

Applied Physics Letters, 94(6), p.061107_1 - 061107_3, 2009/02

 被引用回数:54 パーセンタイル:87.07(Physics, Applied)

2.4MeVのレーザー駆動陽子線を永久四重極磁石で1Hzで収束させた。磁場勾配は、55T/m, 60T/mであった。陽子線は、ターゲットから650mmにおける2.7mm$$times$$8mmの大きさ(半値全幅)の領域に収束された。この結果は、モンテカルロシミュレーションとよく一致した。



白井 敏之*; 田辺 幹夫*; 想田 光*; 池上 将弘*; 藤本 慎司*; 頓宮 拓*; 野田 章*; 野田 耕司*; 渋谷 真二*; 藤本 哲也*; et al.

Proceedings of 9th Symposium on Accelerator and Related Technology for Application, p.19 - 22, 2007/06

The ion storage ring, S-LSR has an electron beam cooler and a laser cooling system. The electron cooler for S-LSR was designed to maximize the effective cooling length in the limited drift space of the ring. Various experiments have been carried out using the electron beam cooling, such as the sweep electron cooling, the one-dimensional ordering experiment of protons, and the short bunch generation. The laser cooling experiment is also currently in progress. Concerning the one-dimensional ordering experiment, the first proton ordering was successfully confirmed. An abrupt drop in the momentum spread and the Schottky noise power have been observed at the proton number of 2000 with electron currents of 25 mA. The transition temperature of the proton ordering is 0.17 meV in the longitudinal direction.


Crystalline beams in dispersion-free storage rings

池上 将弘*; 岡本 宏巳*; 百合 庸介

Physical Review Special Topics; Accelerators and Beams, 9(12), p.124201_1 - 124201_11, 2006/12

 被引用回数:5 パーセンタイル:40.34(Physics, Nuclear)



Energetic protons from a few-micron metallic foil evaporated by an intense laser pulse

松門 宏治*; Esirkepov, T. Z.; 木下 健一*; 大道 博行; 内海 隆行*; Li, Z.*; 福見 敦*; 林 由紀雄; 織茂 聡; 西内 満美子; et al.

Physical Review Letters, 91(21), p.215001_1 - 215001_4, 2003/11

 被引用回数:134 パーセンタイル:95.44(Physics, Multidisciplinary)




水本 元治; 草野 譲一; 長谷川 和男; 大内 伸夫; 小栗 英知; 市原 正弘; 富澤 哲男; 伊藤 崇; 千代 悦司*; 池上 雅紀*; et al.

KEK Proceedings 99-25, p.3 - 5, 2000/02

高エネルギー加速器研究機構と日本原子力研究所とが協力して推進している統合計画では、中性子散乱・原子核物理などの基礎研究と放射性廃棄物の消滅処理などの工学試験を行うための大強度陽子加速器の建設を提案している。この加速器は世界最大規模のビーム出力を持つことになりさまざまな開発課題がある。その中でも、超伝導リニアックの開発と低エネルギー加速部の高デューティ化が大電流陽子ビームを加速するうえで主要な技術課題となる。本発表では、開発の位置づけ、超伝導リニアック部の構成、日本原子力研究所の施設で進めてきた超伝導空胴開発の現状を要約するとともに、イオン源, RFQ, DTLの開発の現状を報告する。


Experimental and analytical study on thermal displacement characteristics of cooling system applied to floating support unit

塙 悟史; 石原 正博; 橘 幸男; 小池上 一*

Proceedings of 8th International Conference on Nuclear Engineering (ICONE-8) (CD-ROM), p.9 - 0, 2000/00




池上 将弘*; 岡本 宏巳*; 百合 庸介; 想田 光*; 田辺 幹夫*; 野田 章*

no journal, , 



原子力機構J-KARENレーザーの高度化とその利用研究,4; 高強度超短パルスレーザー駆動陽子ビームの高周波電場による位相回転法

西内 満美子; 大道 博行; 余語 覚文; 森 道昭; 桐山 博光; 金沢 修平; 匂坂 明人; 小倉 浩一; 織茂 聡; 近藤 修司; et al.

no journal, , 



Applications of the high intensity short-pulse laser driven $$sim$$ MeV proton beam

西内 満美子; 大東 出; 池上 将弘; 森 道昭; 織茂 聡; 小倉 浩一; 匂坂 明人; 余語 覚文; Pirozhkov, A. S.; Ma, J.*; et al.

no journal, , 



Proton acceleration and laser-plasma interaction diagnostics with J-KAREN laser

Pirozhkov, A. S.; 森 道昭; 余語 覚文; 桐山 博光; 小倉 浩一; 匂坂 明人; Ma, J.*; 織茂 聡; 西内 満美子; 杉山 博則*; et al.

no journal, , 

We present results of recent laser-driven proton acceleration experiments and laser-plasma diagnostics conducted with the multi-10-TW hybrid OPCPA/Ti:Sapphire laser J-KAREN. Protons with the energies up to 4 MeV have been generated using few-mcm tape and sub-mcm ribbon targets. The plasma diagnostics including measurement of the pulse energy reflected from the target, interferometry, and spectral measurements reveal the complex dependence of the proton generation on the interaction course. In particular, even slight increase of the target reflectivity results in substantial decrease of the maximum proton energy. This provides convenient diagnostics of the laser-plasma interaction in the ion acceleration, harmonics generation, and other laser - solid target interaction experiments.

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