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Beam emittance investigation in high brightness injector using different driver laser profiles

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Science China(Physics,Mechanics & Astronomy) 2011年第S2期54卷 189-192页

作者： WANG XiaoHui sun baogen LUO Qing School of Nuclear Science and Technology&National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China

Beam emittance plays an important role in any accelerator, and it is a main parameter to judge the performance of an accelerator. Emittance optimization is an indispensable part in conditioning and operation of the facility. For a laser-driven high brightness injector, different time structure of the laser pulse has different effects on transverse emittance. In order to compare Gaussian and flat-top laser pulse, systematic simulations of 500 pC have been done. From the simulation results, one can see that flat-top pulse laser will yield smaller minimal transverse beam size and transverse beam emittance than Gaussian pulse laser.

关键词： transverse emittance laser pulse Gaussian flat-top phase space

Design and cold test of S-BAND cavity BPM for HLS

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Science China(Physics,Mechanics & Astronomy) 2011年第S2期54卷 292-295页

作者： LUO Qing sun baogen JIA QiKa HE DuoHui FANG Jia National Synchrotron Radiation Laboratory School of Nuclear Science and TechnologyUniversity of Science and Technology of ChinaHefei 230029China

An S-band cavity BPM is designed for a new injector in National Synchrotron Radiation Laboratory. A re-entrant position cavity is tuned to the TM110 mode as position cavity. Cut-through waveguides are used as pickups to suppress the monopole signal. Theoretical resolution of this design is 31 nm. A prototype cavity BPM system is manufactured for off-line cold tests. The wire scanning method is used to calibrate the BPM and estimate the performance of the on-line BPM system. A cross-talk problem has been detected during the cold test. Racetrack cavity BPM design can be used to suppress the cross-talk. With the nonlinear effect being ignored, transform matrix can be used to correct cross-talk. Analysis of cold test results shows that the position resolution of prototype BPM is better than 3 μm.

关键词： cavity BPM re-entrant cut-through waveguide cold test wire scanning resolution cross-talk

Beam Measurement System in NSRL

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Journal of Systems Engineering and Electronics 2000年第3期11卷 9-13页

作者： sun, baogen Lu, Ping Wang, Junhua Fang, Zhigao Liu, Jianhong Univ of Science and Technology of China Hefei China

This paper describes the beam measurement system for the accelerator of the National Synchrotron Radiation Laboratory (NSRL). The design considerations of the beam measurement instrumentation system for the NSRL are aided by the commissioning of the machine and provide sufficient machine parameters for machine study as well as the common operation. The beam measurement system includes the part for the linac and transport line and the part for the storage ring. The measurement results are presented in the paper.

关键词： Fluorescent screens Parameter estimation Synchrotron radiation Transport properties

Major parameter measurement of high-brightness injector in Hefei Light Source

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Nuclear Science and Techniques 2011年第4期22卷 200-204页

作者： WANG Xiaohui HE Zhigang sun baogen JIA Qika School of Nuclear Science and Technology & National Synchrotron Radiation Laboratory University of Science and Technology of China HeJei 230029 China

A photocathode radio frequency gun,which is an S-band normal conducting 1.6 copper cell cavity with water cooling system,was installed in Hefei Light *** order to know its characteristics and get it into normal operation,continuous conditioning was conducted in the last few *** charge and dark current charge were measured using integrating current *** beam transverse size was determined as 1.63 mm in minimum using YAG screen and GigE Vision *** multi-slits technique,the transverse emittance was measured and normalized at 1.95 mm·mrad with beam charge of 240 *** results provide a way to optimize the facility.

关键词：参数测量合肥光源喷油器高亮度水冷却系统电流互感器 YAG激光正常运行

The measurement of electron beam transverse sizes by synchrotron radiation interferometry for HLS Ⅱ

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Nuclear Science and Techniques 2012年第4期23卷 193-198页

作者： TANG Leilei sun baogen LU Ping WANG Jigang XIAO Yunyun National Synchrotron Radiation Laboratory&School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230029China

In order to improve accuracy of electron beam transverse sizes measurement,the vertical and horizontal synchrotron radiation light interferometers have been designed to measure beam transverse sizes for the upgrade project of Hefei Light Source(HLS II).In this paper,the light intensity distributions of the interferogram are descussed,and parameters of the interferometers are *** interferograms are simulated under MATLAB. Taking integrations of two-dimensional interferogram intensity,normalized one-dimensional interference intensities distribution of the vertical and horizontal interferogram are *** two curves are fitted to compare the beam transverse sizes with the designed sizes,and this verifies the feasibility of this ***,several factors that affect the beam sizes measurement are discussed.

关键词：干涉测量横向尺寸 HLS 电子束同步辐射 MATLAB环境光强度分布尺寸测量

An active-passive beam current transformer

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Nuclear Science and Techniques 2008年第2期19卷 70-73页

作者： ZHOU Wei sun baogen LU Ping WANG Xiaohui WANG Yong ZHANG Haiyan National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 China

In this article,a new type current transformer was developed using an active-passive circuit to improve low frequency response of the system without impairing high frequency *** active-passive current transformer with... 详细信息

关键词：电流变压器电路频率反应

Development and application of the new BPM system data processing program at Hefei light source

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Nuclear Science and Techniques 2012年第5期23卷 261-266页

作者： MA Tianji YANG Yongliang sun baogen ZOU Junying LU Ping ZHOU Zeran XU Hongliang NSRL School of Nuclear Science and Technology University of Science and Technology of China Hefei 230029 China

A data processing program has been applied for the new beam position monitor (BPM) system of the storage ring at Hefei Light Source (HLS). The new BPM system in the upgrade project will be equipped with Libera Brilliance BPM processors to replace the old Bergoz MX-BPM processors. The embedded Linux system on Libera has completed some important work, including instrument status check,data acquisition, position calculation, EPICS IOC data release,and so on. A new EPICS record type has been developed to recalculate the beam position with log-ratio method. The property of the new position data was analyzed in the time and frequency domain. The results show that the rms value of beam position measurement resolution can be up to submicron. Preliminary studies have been carried out on the measurement of the tune and the beam lifetime with this new BPM system.

关键词：数据处理程序 PM系统合肥光源嵌入式Linux系统 EPICS 应用开发位置数据

HLS bunch current measurement system

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Science China(Physics,Mechanics & Astronomy) 2011年第S2期54卷 309-312页

作者： YANG YongLiang MA TianJi sun baogen LU Ping WANG JiGang ZOU JunYing TANG LeiLei National Synchrotron Radiation Laboratory&School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230029China

Bunch current is an important parameter for studying the injection fill-pattern in the storage ring and the instability threshold of the bunch, and the bunch current monitor also is an indispensable tool for the top-up injection. A bunch current measurement (BCM) system has been developed to meet the needs of the upgrade project of Hefei Light Source (HLS). This paper presents the layout of the BCM system. The system based on a high-speed digital oscilloscope can be used to measure the bunch current and synchronous phase shift. To obtain the absolute value of bunch-by-bunch current, the calibration coefficient is measured and analyzed. Error analysis shows that the RMS of bunch current is less than 0.01 mA when bunch current is about 5 mA, which can meet project requirement.

关键词： bunch current fill-pattern synchronous phase shift Hefei Light Source (HLS)

Development of photon beam position feedback system based on two PBPMs at HLS

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Nuclear Science and Techniques 2013年第2期24卷 12-16页

作者： GU Liming sun baogen XUAN Ke YANG Yongliang LU Ping ZHOU Zeran CHENG Chaocai XU Hongliang School of Nuclear Science and Technology & National Synchrotron Radiation Laboratory University of Science and Technology of China

In this paper,in order to stabilize the position and angle of the light source point,a new photon beam position feedback system based on the Photon Beam Position Monitors was developed on Hefei Light Source,and used to correct the position drift and angle variation of the light source at the same *** introducing the feedback principle,the transfer function matrix is calibrated,indicating that the new system is workable and effective.

关键词：位置反馈系统光子束基础 HLS 传递函数矩阵合肥光源反馈原理点光源