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Generation and measurement of sub-picosecond electron bunch in photocathode rf gun

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Chinese Physics C 2013年第12期37卷 88-92页

作者：李伟伟何志刚贾启卡 National Synchrotron Radiation Laboratory University of Science and Technology of China

We consider a scheme to generate a sub-picosecond electron bunch in the photocathode rf gun by im-proving the acceleration gradient in the gun, suitably tuning the bunch charge, the laser spot size and the acceleration phase, and reducing the growth of transverse emittance by laser shaping. A nondestructive technique is also reported to measure the electron bunch length, by measuring the high-frequency spectrum of wakefield radiation which is caused by the passage of a relativistic electron bunch through a channel surrounded by a dielectric.

关键词： photocathode rf gun sub-picosecond electron bunch bunch length measurement wakefield radiation

Compact narrow-band THz radiation source based on photocathode rf gun

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Chinese Physics C 2014年第4期38卷 88-92页

作者：李伟伟何志刚贾启卡 National Synchrotron Radiation Laboratory University of Science and Technology of China

Narrow-band THz coherent Cherenkov radiation can be driven by a subpicosecond electron bunch trav- eling along the axis of a hollow cylindrical dielectric-lined waveguide. We present a scheme of compact THz radiation source based on the photocathode rf gun. On the basis of our analytic result, the subpicosecond electron bunch with high charge （800 pC） can be generated directly in the photocathode rf gun. According to the analytical and simulated results, a narrow emission spectrum peaked at 0.24 THz with 2 megawatt （MW） peak power is expected to gain in the proposed scheme （the length of the facility is about 1.2 m）.

关键词： photocathode rf gun subpicosecond electron bunch coherent Cherenkov radiation THz source

Compact THz radiation source based on photocathode rf gun

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Compact THz radiation source based on photocathode RF gun

Design of an MeV ultra-fast electron diffraction experiment at Tsinghua university

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作者： LIU ShengGuang URAKAWA JunJi Key Laboratory for Laser Plasmas(Ministry of Education) Department of PhysicsShanghai Jiao Tong University High Energy Accelerator Research Organization

Terahertz(THz) science and technology have already become the research highlight at *** this paper,we put forward a proposal to generate THz radiation at tens of MW peak *** a result of the ultrafast laser and the high accelerating field of photocathode rf gun,we can generate and accelerate an electron beam to several MeV,of which the bunch length is less than *** the short electron bunches are injected into the wiggler,THz radiation based on Coherent Synchrotron Radiation could be achieved with tens of MW peak *** whole THz FEL facility can be scaled to the size of a tabletop.

关键词： ultrafast laser photocathode rf gun THz wave coherent radiation

来源： cnki会议评论

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Chinese Physics C 2009年第S2期33卷 165-167页

作者：李任恺唐传祥黄文会杜应超施嘉儒颜立新 Department of Engineering Physics Tsinghua University Key Laboratory of Particle & Radiation Imaging (Tsinghua University) Ministry of Education Key Laboratory of High Energy Radiation Imaging Fundamental Science for National Defense

Time-resolved MeV ultra-fast electron diffraction (UED) is a powerful tool for structure dynamics studies. In this paper, we present a design of a MeV UED facility based on a photocathode rf gun at Tsinghua University. Electron beam qualities are optimized with numerical simulations, indicating that resolutions of 250 fs and 0.01 , and bunch charge exceeding 105 electrons are expected with technically achievable machine parameters. Status of experiment preparation is also presented.

关键词： ultra-fast electron diffraction MeV photocathode rf gun

Bunch length measurement at Tsinghua Thomson scattering X-ray source

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Chinese Physics C 2011年第5期35卷 505-508页

作者：杜应超华剑飞颜立新杜强黄文会唐传祥 Accelerator Laboratory Department of Engineering Physics Tsinghua University Key Laboratory of Particle and Radiation Imaging (Tsinghua University) Ministry of Education Key Laboratory of High Energy Radiation Imaging Fundamental Science for National Defense

The length of electron beam from a photocathode rf gun is determined by a spectrometer, according to the relative energy spread induced by the bunch length during the acceleration in a linac. For a photocathode rf gun, different laser injected phase and beam charge are studied. The compression is changed for the different laser phases, as from 10 ° to 30 ° , and the bunch length is lengthened due to the strong longitudinal space charge force, caused by the increased charge.

关键词： bunch length measurement energy spread photocathode rf gun

TW Laser system for Thomson scattering X-ray light source at Tsinghua University

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Chinese Physics C 2009年第S2期33卷 154-156页

作者：颜立新杜应超杜强李任恺华剑飞黄文会唐传祥 Accelerator Laboratory Department of Engineering Physics Key Laboratory of Particle & Radiation Imaging Ministry of Education Tsinghua University

A TW (Tera Watt) laser system based on Ti:sapphire mainly for the Tsinghua Thomson scattering X-ray light source (TTX) is being built. Both UV (ultraviolet) laser pulse for driving the photocathode radiofrequency (rf) gun and the IR (infrared) laser pulse as the electron-beam-scattered-light are provided by the system. Efforts have also been made in laser pulse shaping and laser beam transport to optimize the high-brightness electron beam production by the photocathode rf gun.

关键词： Thomson scattering TW laser photocathode rf gun