Optimization of Electron Storage Ring for Free Electron Laser

自由电子激光器电子存储环的优化

基本信息

项目摘要

1. The observed longitudinal electron distribution distorted by a potential-well distortion effect that takes account the ring impedance divided into resistive and inductive parts. The first FEL macropulse evolves on a negative momentum compaction ring is predicted to be much higher than that on conventional positive momentum compaction ring by a simulation including the potential-well distortion effect. In addition, the FEL power at a equilibrated state on the negative momentum compaction ring would reach the same level as that on the positive ring, even the microwave instability exists.2. The FEL oscillation becomes to be unstable and the its macropulse structure is being varied when the optical resonator is slightly unstable, which was evidently observed by using a streak camera. In order to secure stable FEL oscillation, the FEL pulse and the electron bunch should be strictly kept at the best synchronism. A feedback system was developed to keep such synchronism by detecting a phase difference of those higher harmonics instead of measuring time deviation. The system worked very well and excellently stable FEL was obtained.3. Because of stable FEL oscillation, the electron bunch lengthening due to the FEL interaction was able to be precisely observed. Although the bunch lengthening was apparently not strongly, taking the potential-well distortion effect into account, the FEL induced energy spread derived by a analysis was found to be very large. However agreement of the measured energy spread with a theoretical prediction was not perfect. Further investigation is required.4. Optimization of the cavity mirrors was also developed. By using suitable materials for the coating, mirros with both very high refrectance and transmittance were realized. As a results, the highest record of extracted FEL power on the storage rings was achieved (>0.5 W), which is now followed by a new two-color experiment to study the mechanism of photo-dissociation of gas molecules.
1.观察到的纵向电子分布受势垒扭曲效应的影响,该效应考虑了分为阻性部分和电感部分的环阻抗。通过考虑势垒扭曲效应的模拟,预测了第一个自由电子激光宏脉冲在负动量压缩环上的演化比在常规正动量压缩环上的演化要高得多。此外,负动量压缩环上处于平衡态的自由电子激光功率将达到正动量压缩环上的水平,甚至存在微波不稳定性。当光学谐振腔稍有不稳定时,自由电子激光振荡变得不稳定,其宏脉冲结构发生变化,这是用条纹相机明显观察到的。为了保证稳定的自由电子激光振荡,必须严格保持自由电子激光脉冲和电子束的最佳同步。开发了一种反馈系统,通过检测高次谐波的相位差来保持这种同步,而不是测量时间偏差。系统运行良好,获得了稳定的自由电子激光。由于稳定的自由电子激光振荡,能够精确地观察到自由电子激光相互作用引起的电子束延长。虽然束团延长明显不是很强烈,但考虑到势垒扭曲效应,由分析得到的自由电子激光诱导的能散很大。然而,测量的能量扩散与理论预测的一致性并不是完美的。还需要进一步调查。并对腔镜进行了优化设计。通过选择合适的镀膜材料,实现了反射率和透过率都很高的反射镜。结果,在储存环上获得了最高的提取自由电子激光功率(>0.5W),随后又进行了一种新的双色实验来研究气体分子的光解离机理。

项目成果

期刊论文数量(38)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
H.Hama et al.: "Longitudinal Beam Dynamics and FEL Interaction on a Negative Momentum Compaction Storage Ring"Nuclear Instruments. A429. 172-178 (1999)
H.Hama 等人:“负动量压实存储环上的纵向束动力学和 FEL 相互作用”核仪器。
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M. Hosaka et al.: ""FEL Induced Electron Bunch Heating Observed by a Method Based on Synchronous Phase Detection""Nuclear Instruments and Methods in Physics Research. A475. 217-221 (2001)
M. Hosaka 等人:“基于同步相位检测的方法观察到的 FEL 诱导电子束加热”“物理研究中的核仪器和方法”。
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M. Hosaka et al.: ""Temporal Stability of the UVSOR-FEL Micropulse""Nuclear Instruments and Methods in Physics Research. A445. 208-213 (2000)
M. Hosaka 等人:“UVSOR-FEL 微脉冲的时间稳定性”“物理研究中的核仪器和方法”。
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M.Hosaka et.al.: "FEL Induced Electron Bunch Heating Observed by a Method Based on Synchronous Phase Detection"Nucl.Instr.and Meth.in Phys.Res.A. (印刷中).
M.Hosaka 等人:“通过基于同步相位检测的方法观察 FEL 诱导电子束加热”Nucl.Instr.and Meth.in Phys.Res.A(出版中)。
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H.Tanaka et al.: "A Preservative formulation of Nonlinear Dispersion for Particle Motion in Storage Rings"Nuclear Instruments and Methods. A431. 217-221 (1999)
H.Tanaka 等人:“存储环中粒子运动的非线性分散的保存配方”核仪器和方法。
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HAMA Hiroyuki其他文献

HAMA Hiroyuki的其他文献

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{{ truncateString('HAMA Hiroyuki', 18)}}的其他基金

Direct observation of the longitudinal phase space distribution of electron beam for investigation of micro-bunching instability
直接观察电子束纵向相空间分布以研究微聚束不稳定性
  • 批准号:
    24651096
  • 财政年份:
    2012
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Study and Development of Extremely Short Pulse Coherent Terahertz Light Source Employing an Electron Isochronous Ring
采用电子等时环的极短脉冲相干太赫兹光源的研究与开发
  • 批准号:
    20226003
  • 财政年份:
    2008
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (S)
Research of High Quality Electron Beam and THz-FEL Based on Numerical Simulation for Electromagnetic Fields Employing a 3-D FDTD Method
基于 3-D FDTD 方法电磁场数值模拟的高质量电子束和 THz-FEL 研究
  • 批准号:
    17360035
  • 财政年份:
    2005
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)

相似海外基金

Development of a laser-cooling system for a low emittance electron storage ring
低发射电子存储环激光冷却系统的开发
  • 批准号:
    18K18769
  • 财政年份:
    2018
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Challenging Research (Exploratory)
Development of a new beam injection scheme for a small electron storage ring
小型电子存储环的新型束注入方案的开发
  • 批准号:
    23656064
  • 财政年份:
    2011
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Study on coherent THz radiation from electron storage ring
电子存储环相干太赫兹辐射研究
  • 批准号:
    23600008
  • 财政年份:
    2011
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Momentum acceptance study of an electron storage ring by observing laser Compton scattering gamma-rays and single-electron loss events
通过观察激光康普顿散射伽马射线和单电子损失事件进行电子存储环动量接受研究
  • 批准号:
    23760071
  • 财政年份:
    2010
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
High Power THz Radiation From Electron Storage Ring By Means Of Beam Instability
电子存储环通过束流不稳定性产生高功率太赫兹辐射
  • 批准号:
    18560046
  • 财政年份:
    2006
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Efficient generation of polarized gamma-rays by using a pulse laser beam stacking cavity and an electron storage ring
使用脉冲激光束堆叠腔和电子存储环有效产生偏振伽马射线
  • 批准号:
    18340076
  • 财政年份:
    2006
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Production of Far-infrared Coherent Synchrotron Radiation on Electron Storage Ring
电子存储环上产生远红外相干同步辐射
  • 批准号:
    15360038
  • 财政年份:
    2003
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Support of the Cornell Electron Storage Ring (CESR) Facility
康奈尔电子存储环 (CESR) 设施的支持
  • 批准号:
    0202078
  • 财政年份:
    2003
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Cooperative Agreement
Support of the Cornell Electron Storage Ring (CESR) Facility
康奈尔电子存储环 (CESR) 设施的支持
  • 批准号:
    9809799
  • 财政年份:
    1999
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Cooperative Agreement
Support of the Cornell Electron Storage Ring (CESR) Facility
康奈尔电子储存环 (CESR) 设施的支持
  • 批准号:
    9310764
  • 财政年份:
    1993
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Cooperative Agreement
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