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Characteristics of terahertz coherent transition radiation generated from picosecond ultrashort electron bunches

Chinese Physics B 2010年第6期19卷 221-230页

作者：刘文鑫唐传祥黄文会 Department of Engineering Physics Tsinghua University Key Laboratory of Particle & radiation Imaging (Tsinghua University) Ministry of EducationTsinghua University Key Laboratory of High Energy radiation Imaging Fundamental Science for National Defense Tsinghua University

This paper presents a method of generating terahertz （THz） coherent transition radiation （CTR） from picosecond ultrashort electron bunches including single and train bunches, which are produced by a photocathode radio frequency gun. The radiation characteristics of THz CTR including formation factor and energy spectrum are analysed in detail. With the help of a 2-dimensional particle-in-cell simulation, the radiation characteristics including power, energy and magnetic field are analysed. The results show that the radiation frequency can be adjusted by tuning the repetition frequency of the train bunch and the energy can be enhanced with the train bunches.

关键词： coherent transition radiation photocathode radio-frequency gun ultrashort electron bunches particle-in-cell

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Terahertz coherent transition radiation based on an ultrashort electron bunching beam

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Chinese Physics B 2011年第7期20卷 165-171页

作者：刘文鑫黄文会杜应超颜立新吴岱唐传祥 Department of Engineering Physics Tsinghua University Key Laboratory of High Power Microwave Sources and Technologies Institute of ElectronicsChinese Academy of Sciences

The experimental result of terahertz （THz） coherent transition radiation generated from an ultrashort electron bunching beam is reported. During this experiment, the window for THz transmission from ultrahigh vacuum to free air is tested. The compact measurement system which can simultaneously test the THz wave power and frequency is built and proofed. With the help of improved Martin-Puplett interferometer and Kramers-Krong transform, the longitudinal bunch length is measured. The results show that the peak power of THz radiation wave is more than 80 kW, and its radiation frequency is from 0.1 THz to 1.5 THz.

关键词： coherent transition radiation ultrashort electron bunching beam Martin-Puplett interferometer compact measurement system

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A proposed method to characterize high harmonic microbunching in EEHG operation of SDUV-FEL

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Chinese Physics C 2010年第10期34卷 1649-1654页

作者：邓海啸 Shanghai Institute of Applied Physics Chinese Academy of Sciences

The echo-enabled harmonic generation （EEHG） scheme offers remarkable efficiency for generating high harmonic microbunching with a relatively small energy modulation. A proof of principle experiment of the EEHG scheme has been proposed at the Shanghai deep ultraviolet （SDUV） free electron laser （FEL） facility, where the 4th harmonic of the seed laser is amplified in the 9 m long radiator. To explore the advantages of the EEHG scheme, in this paper, a method of measuring the coherent high harmonic radiation of the radiator is proposed to investigate the electron beam microbunching corresponding to the 10th-20th harmonics of the seed laser. The principle of the proposed method, comparisons with existing methods and the simulation results are presented and discussed.

关键词： harmonic microbunching coherent transition radiation coherent harmonic radiation

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