Coherent X-ray Generation by Laser Wakefield

激光韦克菲尔德产生相干 X 射线

• 批准号: 07458094
• 负责人: OGATA Atsushi
• 金额: $ 4.61万
• 依托单位: National Laboratory for High Energy Physics (KEK)
• 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-07458094/
• 关键词: plasma acceleration; laser acceleration; coherent radiation generation; wakefield; x-ray generatoin; レーザ; プラズマ; 加速器; 放射光; アンジュレータ; コヒーレンズ; 自由電子レーザ; コンプトン散乱

We have been studying particle acceleration using plasmas. In these studies, it was found that the transverse plasma wakefield shifts the beam normal to its axis. A geometry is realizable in which this beam shift becomes periodic and continuous, enabling emission of the synchrotron radiation based on the principle of the undulator.The final goal of the present study is the experimental demonstration of this radiation emission. Step-by-step milestones to reach the goal are :1) theoretical study,2) study of laser propagation in a gas,3) synchronization between laser beams and particle beams in femtosecond range,4) laser wakefield acceleratoin of particle beams,5) radiation generation by the combination of laser beams and particle beams (in the absence of plasmas), and establishment x-ray detection technique in the femtosecond range,6) x-ray generation by the plasma undulatorResults in steps 1)-5) have been accomplished in this year. Each of the step contains the first experimental result in the world ; For example, optical guiding of lasers were verified in step 2), and energy gain exceeding 100MeV was observed in step 4). These have been made under collaboratoin with JAERI and NERL,Univ.of Tokyo.

我们一直在研究使用等离子体的粒子加速。在这些研究中，发现横向等离子体尾场使光束垂直于其轴移动。可以实现一种几何形状，其中这种光束移动变得周期性和连续，从而能够基于波荡器原理发射同步加速器辐射。本研究的最终目标是这种辐射发射的实验演示。实现这一目标的逐步里程碑是：1）理论研究，2）气体中激光传播的研究，3）飞秒范围内激光束和粒子束之间的同步，4）粒子束的激光尾场加速，5）激光束和粒子束组合（在没有等离子体的情况下）产生辐射，以及建立气体中的X射线检测技术。 飞秒范围，6）等离子体波荡器产生X射线步骤1）-5）中的结果已于今年完成。每一步都包含世界首创的实验结果；例如，在步骤2)中验证了激光器的光导，并且在步骤4)中观察到了超过100MeV的能量增益。这些是与 JAERI 和东京大学 NERL 合作完成的。

项目成果

K.Nakajima, M.Kando, T.Kawakubo, H.Nakanishi and A.Ogata: "A Table-Top X-Ray FEL Based on the Laser Wakefield Accelerator-Undulator System" Nucl.Instr.and Meth.A375. 593-596 (1996)

K.Nakajima、M.Kando、T.Kawakubo、H.Nakanishi 和 A.Ogata：“基于激光韦克场加速器波荡器系统的桌面 X 射线 FEL”Nucl.Instr.and Meth.A375。

K.Nakajima, D.Fisher, T.Kawakubo, H.Nakanishi, A.Ogata, Y.Kato, Y.Kitagawa, R.Kodama, K.Mima, H.Shiraga, K.Suzuki, K.Yamakawa, T.Zhang, Y.Sakawa, T.Shoji, Y.Nishida, N.Yugami, M.Downer and T.Tajima: "Observation of Ultrahigh Gradient Electron Acceleration

K.Nakajima、D.Fisher、T.Kawakubo、H.Nakanishi、A.Ogata、Y.Kato、Y.Kitakawa、R.Kodama、K.Mima、H.Shiraga、K.Suzuki、K.Yamakawa、T.

A.Ogata,K.Nakajima,et al.: "Production of Microbunches by a Laser Wakefield in a Plasma and Its Application : X-Ray Generation" AIP Conf.Proc.367. 463-472 (1996)

A.Ogata、K.Nakajima 等人：“等离子体中激光韦克场的微束生产及其应用：X 射线生成”AIP Conf.Proc.367。

K.Nakajima et al.,: "Observation of Ultra-High Gradient Electron Acceleration by a Self-Modulated Intense Short Laser Pulse" Physical Review Letters. 74. 4428-4431 (1995)

K.Nakajima 等人，“通过自调制强短激光脉冲观察超高梯度电子加速”物理评论快报。

小方 厚: "新局面を迎えたプラズマ加速" 日本物理学会誌. 50. 736-738 (1995)

Atsushi Ogata：“等离子体加速达到新阶段”日本物理学会杂志 50. 736-738 (1995)。