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Micron-size hydrogen cluster targets for over 100 MeV, high-repetitive, impurity-free proton beams via relativistic laser-plasma interactions
https://repo.qst.go.jp/records/72149
https://repo.qst.go.jp/records/72149751145c2-d6d5-4d50-ac01-5f01515b44b2
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2017-02-02 | |||||
| タイトル | ||||||
| タイトル | Micron-size hydrogen cluster targets for over 100 MeV, high-repetitive, impurity-free proton beams via relativistic laser-plasma interactions | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Fukuda, Yuuji
× Fukuda, Yuuji× Jinno, S.× Kanasaki, M.× Tanaka, H.× Sakaki, Hironao× Kondo, Kiminori× Matsui, Ryutaro× Kishimoto, Yasuaki× 福田 祐仁× 榊 泰直× 近藤 公伯× 松井 隆太郎× 岸本 泰明 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The laser-driven ion acceleration has been one of the most active areas of research during the last several years, because the accelerated ion beams have unique properties such as ultrashort duration, high brilliance, and low emittance. The recent advancements in laser-driven ion acceleration techniques using thin foil targets now allow the maximum proton energies above 85 MeV. 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. Meanwhile, PW class high power lasers now open up a new regime of laser-matter interactions at intensities 10^21-22 W/cm^2. In such a high intensity regime, the Coulomb explosion of clusters results in a pronounced increase in accelerated ion energies, i.e. over 100 MeV proton beams could be produced via the Coulomb explosion of micron-size hydrogen clusters. Such high purity proton beams would be quite advantageous for nuclear physical studies and medical applications. The recent results on electrostatic collisionless shock accelerations of pure protons up to 22 MeV with narrow energy spread obtained with a CO^2 laser (~10. 6 μm) irradiation on near-critical hydrogen gas targets (~10^19 cm^-3) made a significant step towards practical applications of laser-driven proton beams. In this context, high density hydrogen gas jets (~10^21 cm^-3) as well as cryogenically cooled hydrogen based targets (~10^22 cm^-3) have also attracted a great deal of interest as a promising near-critical density media for the development of high-repetitive laser-driven “pure” proton sources using Ti:Sapphire lasers (~0.8 μm). Given this situation, we have developed a new cluster target formation system which consists of a pulsed solenoid valve, a conical nozzle, and a liquid helium cooling head, having a potential to produce micron-size hydrogen clusters. The size distribution measurement, conducted by using the Mie scattering method, demonstrates that hydrogen clusters with diameters of 0.5~1.5 μm are produced. The 3D PIC code simulations support a generation of over 100 MeV forward accelerated protons via the Coulomb explosion of a single micron-size hydrogen cluster at a laser intensity of 1×10^22 W/cm^2. |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | International Symposium on Ultrafast Intense Laser Science 15 | |||||
| 発表年月日 | ||||||
| 日付 | 2016-10-04 | |||||
| 日付タイプ | Issued | |||||
