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Parameter study for enhanced high gain harmonic generation scheme

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Chinese Physics C 2011年第9期35卷 880-884页

作者：贾启卡李和廷 National Synchrotron radiation Laboratory University of Sicence and Technology of China

An easy-to-implement scheme called Enhanced High Gain Harmonic Generation is expected to be able to significantly enhance the performance of HG-FEL. In this paper we investigate the effects of the system parameters in the new scheme, including the electron energy detuning, initial electron-beam energy spread, seeding laser power, dispersive field strength and amount of the phase shift, etc. The numerical results from GENESIS （3D-code） are presented and show that the new scheme has acceptable parameters tolerance requirements and is no more or even less sensitive to the system parameters than that of the existing scheme; With the electron energy above the resonance, the efficiency is enhanced for both the new scheme and the existing scheme compared with the resonant energy case.

关键词： harmonic generation bunching factor radiation power

Calculation of Gas Bremsstrahlung power from Straight Section of Storage Ring at SSRF

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Chinese Physics C 2008年第Z1期32卷 89-92页

作者：花正东许浔江方克明徐加强王建华蔡军刘鑫中国科学院上海应用物理研究所上海201800

The Shanghai Synchrotron radiation Facility(SSRF)is a third-generation synchrotron radiation light source with 3.5GeV in energy,which is composed of the linear accelerator,the booster and the storage *** storage ring provides 16 standard straight sections of 6.5m and 4 long straight sections of 12 meters. Gas Bremsstrahlung(GB)produced by the interaction of the stored beam with the residual gas molecules in straight section,which is so intense and has a very small angular that the GB spectra,the GB power and the GB power distribution should be *** characters of GB are studied by means of Fluka Monte Carlo *** result shows agreement with those obtained by the experiential formulae.

关键词： gas bremsstrahlung straight section radiation power radiation length

Active sound control by directional sources in the free field

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Chinese Journal of Acoustics 1995年第4期14卷 307-316页

作者： HOU Hong WANG Chong YANG Jianhua and SUN Jincai(Institute of acoustic engineering. Northwestern Polytechnical University. Xi’an 710072)

In this paper, a general formula for calculating the complex strengths of secondary sources is derived from the minimization criterion of total acoustic power output when both of the primary and secondary sources are directional. Then specific properties of active sound attenuation are presented for some commonly used typical directional sources and the rule for distributing directional secondary sources is given.

关键词： Directivity Complex strength radiation power