Verification of Multistage Particle Acceleration by Laser Beat-waves

激光拍波验证多级粒子加速

• 批准号: 07458092
• 负责人: KITAGAWA Yoneyoshi
• 金额: $ 4.99万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07458092/
• 关键词: Laser beat-wave acceleration; After-acceleration; Ultra short pulse laser; Electron beam; Raman scattering; Thomson scattering; 航跡場; 炭酸ガスレーザー; ビ-ト波; プラズマ波; 多段加速; 超短パルス; チャープパルス

The purpose of this project is to verify multistage laser acceleration feasibility using an ultra short pulse laser, which is to after-accelerate MeV electrons once accelerated by the laser-beat-wave. Soin the past two years, we have mainly constructed an ultra-short pulse high intensity laser system.In the first year (1995), we have demonstrated electron accelerations of a few hundred keV accompanied with a CO_2 laser backward Raman scattering. Thus accelerated high energy electrons are the seed electrons to be injected into the laser accelerator, either beat-wave or wakefield one. By YAG laser Thomson scattering, we have measured both temporally and spatially resolved spectrum of beat-wave excited relativistic plasma waves. We have started to construct a short pulse glass laser system for after-acceleration of electrons.In the second year (1996), we have modified the Gekko MII glass laser system to short pulse laser. We have changed the front end to Ti : Sapphire oscillator and regenerative amplifier combination system. At the output of the final spatial filter we put a pulse compression grating pair. The completed system produces 25J in 0.7ps or 35TW.Now we are doing a solid target illumination, where high enegy ion and neutron are detected. Soon we will do gas-jet experiment, in which the wakefield will be excited and electrons will be accelerated.

本课题的目的是验证利用超短脉冲激光器进行多级激光加速的可行性，即利用激光热波对MeV电子进行一次后加速。因此，在过去的两年中，我们主要构建了一个超短脉冲高强度激光系统。在第一年（1995年），我们已经证明了几百keV的电子加速伴随着CO_2激光的反向拉曼散射。因此，加速的高能电子是被注入激光加速器的种子电子，无论是热波加速器还是尾流加速器。通过YAG激光汤姆逊散射，我们测量了热波激发相对论等离子体波的时间和空间分辨光谱。我们已经开始构建用于电子后加速的短脉冲玻璃激光系统。在第二年（1996年），我们将Gekko MII玻璃激光系统修改为短脉冲激光。我们将前端改为钛蓝宝石振荡器和再生放大器组合系统。在最后的空间滤波器的输出端，我们放置了一个脉冲压缩光栅对。完整的系统在0.7ps或35TW中产生25J。现在我们正在做一个固体目标照明，在那里可以探测到高能离子和中子。不久我们将做气体喷射实验，尾流场将被激发，电子将被加速。

项目成果

Y.Kitagawa: "PΔR measurement of imploded cryogenic foam target by DD-protons" Proceedings of Laser interaction and related plasma phenomena (AIP press). CP369. 136-143 (1996)

Y. Kitakawa：“DD 质子对内爆低温泡沫目标的 PΔR 测量”《激光相互作用和相关等离子体现象》（AIP 出版社）136-143（1996 年）。

北川米喜: "Energy from Inertial Fusion:4.3章" IAEA,ed,by W.J.Hogan, 457 (1995)

北川米树：“惯性聚变的能量：第 4.3 章” IAEA，W.J.Hogan 编辑，457 (1995)

北川米喜: "原子力と先端技術[III]第2章レーザー加速と応用" 原子力システム研究懇話会, 191 (1996)

北川米树：《核能与先进技术[III]第2章激光加速与应用》核系统研究论坛，191（1996）

Y.Kato: "Approaches to fast ignition in inertial confinement fusion at ILE,Osaka" Proceedings of the 16th IAEA Fusion Energy Conference. (発表予定). IAEA-CN-64 B2/6 (1997)

Y.Kato：“大阪 ILE 中的快速点火方法”第 16 届 IAEA 聚变能源会议记录（待提交）。

Y.Kitagawa: "Thomson scattering measurement of the beat-wave excited relativistic plasma waves" Proc.Laser interaction and related plasma phenomena (AIP press). CP369. 690-694 (1996)

Y.Kitakawa：“拍频激发相对论等离子体波的汤姆逊散射测量”Proc.Laser 相互作用和相关等离子体现象（AIP 出版社）。