共查询到20条相似文献,搜索用时 15 毫秒
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介绍了在合肥光源开展逐束团测量(横向和纵向)和横向束流反馈系统研究和研制的重要性,同时还介绍了设计思想。合肥光源高频频率为204 MHz,因此,系统至少需要100 MHz的带宽。还较详细地介绍了宽带部件和系统参数的选择原则。该系统不仅可用于研究由于高频腔中的高阶模和真空室的阻抗壁效应所引起的耦合束团不稳定性,而且还能抑制耦合束团不稳定性振荡、快速束流离子不稳定性和注入大幅度振荡等,从而将提高机器的运行性能。 相似文献
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To combat electron beam instabilities, a digital bunch-by-bunch transverse feedback (TFB) system has been developed for the Duke storage ring. While it is capable of suppressing transverse beam instabilities for multibunch operation, the TFB system has not been needed for typical operation of the Duke storage ring. To explore the great potential of this system, we have developed beam diagnostic techniques using the TFB, in particular, the TFB based tune measurement techniques. The tune measurement technique allows us to conduct fast chromaticity measurements, compared with the existing chromaticity measurement system using a network analyzer. This new tune measurement system also enables us to measure the bunch tune for multibunch operation of the Duke storage ring. With the TFB based tune measurement system, we have studied the tune stability of the electron beam in the Duke storage ring. This tune system has also been used to calibrate the tune knob for the Duke storage ring. 相似文献
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ZHAO Yu-Bin YIN Cheng-Ke ZHANG Tong-Xuan FU Ze-Chuan ZHAO Zhen-Tang DAI Zhi-Min LIU Jian-Fei WANG Fang 《中国物理C(英文版)》2008,32(9)
This paper describes a field programming gate array(FPGA)based low level radio frequency (LLRF)prototype for the SSRF storage ring RF system.This prototype includes the local oscillator(LO),analog front end,digital front end,RF out,clock distributing,digital signal processing and communication functions.All feedback algorithms are performed in FPGA.The long term of the test prototype with high power shows that the variations of the RF amplitude and the phase in the accelerating cavity are less than 1%and 1°respectively.and the variation of the cavity resonance frequency is controlled within ±10 Hz. 相似文献
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Digital prototype of LLRF system for SSRF 总被引:2,自引:0,他引:2
This paper describes a field programming gate array (FPGA) based low level radio frequency (LLRF) prototype for the SSRF storage ring RF system. This prototype includes the local oscillator (LO), analog front end, digital front end, RF out, clock distributing, digital signal processing and communication functions. All feedback algorithms are performed in FPGA. The long term of the test prototype with high power shows that the variations of the RF amplitude and the phase in the accelerating cavity are less than 1% and 1° respectively, and the variation of the cavity resonance frequency is controlled within ±10 Hz. 相似文献
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选择了一台商业化的前端电子学RFTF(radio frequency front-end for transverse feedback system)用于BEPCII横向束流反馈系统, 这是跟进世界先进加速器技术的具体实施。在BEPC同步运行模式下对RFTF的性能进行了测试实验,结果表明使用RFTF可以得到理想的波形,能够满足BEPCII横向反馈系统的需要,但是,当储存环出现不稳性时,系统无法正常工作,这就要求BEPCII纵向不稳定很小或者用纵向反馈系统来抑制存在的纵向不稳定。 相似文献
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选择了一台商业化的前端电子学RFTF(radio frequency front-end for transverse feedback system)用于BEPCII横向束流反馈系统, 这是跟进世界先进加速器技术的具体实施。在BEPC同步运行模式下对RFTF的性能进行了测试实验,结果表明使用RFTF可以得到理想的波形,能够满足BEPCII横向反馈系统的需要,但是,当储存环出现不稳性时,系统无法正常工作,这就要求BEPCII纵向不稳定很小或者用纵向反馈系统来抑制存在的纵向不稳定。 相似文献
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Cai Jun Xia XiaoBin Xu XunJiang Liu Xin Xu JiaQiang Wang GuangHong Zeng Ming 《中国科学:物理学 力学 天文学(英文版)》2011,54(2):279-282
Experiments on beam loss by using beam loss monitoring (BLM) system were carried out at Shanghai Synchrotron Radiation Facility (SSRF) injector. This system used highly sensitive and current-integrated Si-photodiode detectors and an Ethernet data acquisition (DAQ) system. The experimental results demonstrate that the Si-photodiode detectors are a useful tool that provides dynamic information on beam loss and investigates problems of machine operation. It also shows that the Si-photodiode BLM system is suitable for pulse-radiation of high-energy accelerators.
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The first extracting mirror is very important for synchrotron radiation monitor (SRM). The SRM system of SSRF (Shanghai Synchrotron Radiation Facility) should extract the visible light with low optical distortion. The analysis of SR power spectrum and heat transfiguration based on Matlab is introduced in this paper, which will be used in calibration. One beryllium mirror with water-cooling is used to transmit X-ray and reflect visible light to satisfy the measurement request. The existing system suffers from a dynamic problem in some beam physics study. The system includes optics, image acquisition and interferometers. One of the instruments is a digital camera providing the image of the beam transverse profile. The hardware configuration will be summarized. The synchrotron radiation measurement system has been in operation in SSRF for more than one year. 相似文献
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V. M. Zhabitsky 《Physics of Particles and Nuclei Letters》2013,10(1):74-80
The transient beam response to an external impulse force in synchrotrons with a digital transverse feedback system is studied. The experimental data on damping coherent transverse oscillations of bunch excited by a discrete-time unit impulse in the Large Hadron Collider (LHC) are analyzed. Good agreement between the measured and theoretically predicted decrements has been obtained. A method of feedback fine tuning based on measurements of the bunch response to a harmonic excitation impulse is discussed. 相似文献
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介绍了小波分析方法在逐束团束流位置测量系统中的应用。小波分析方法在高频处频率窗口较宽,具有较高的时间分辨力,使用小波分析可分离并提取信号的振荡成分及基线漂移成分,各成分在时间轴上的位置与原信号相同,原有的线性关系保持不变,在处理非平稳信号时不会造成信号明显劣化,如幅度失真和相位偏差。基于小波分解和重构的时间序列多分辨力滤波处理非平稳信号时不会造成信号明显劣化,保证了追踪束团振荡强度、相位、频率和振荡模式随时间变化的结果更真实可信。在合肥光源中,小波分析方法成功用于横向振荡振幅包络的提取及增长率、阻尼率的计算,也可用于提取横向振荡振幅包络及计算增长率和阻尼率,为机器研究、束流诊断和逐束团反馈系统调试提供了准确的依据。 相似文献
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介绍了小波分析方法在逐束团束流位置测量系统中的应用。小波分析方法在高频处频率窗口较宽,具有较高的时间分辨力,使用小波分析可分离并提取信号的振荡成分及基线漂移成分,各成分在时间轴上的位置与原信号相同,原有的线性关系保持不变,在处理非平稳信号时不会造成信号明显劣化,如幅度失真和相位偏差。基于小波分解和重构的时间序列多分辨力滤波处理非平稳信号时不会造成信号明显劣化,保证了追踪束团振荡强度、相位、频率和振荡模式随时间变化的结果更真实可信。在合肥光源中,小波分析方法成功用于横向振荡振幅包络的提取及增长率、阻尼率的计算,也可用于提取横向振荡振幅包络及计算增长率和阻尼率,为机器研究、束流诊断和逐束团反馈系统调试提供了准确的依据。 相似文献
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为了进一步提高相位测量精度,上海光源束测组在原有逐束团相位测量系统基础上,提出了一种新的信号处理方式——相关函数法。此方法无需对原始束流信号进行低通滤波,通过直接在时域对示波器全部采样点进行模式匹配来计算逐束团相位,其优势在于数据处理仅受仪器带宽限制,可以保留更多的高次谐波信号。研究结果表明,新方法可避免低通滤波带来的束团间信号串扰问题,降低信号反射带来的系统测量误差。主成分分析法被用来评估相位测量分辨率,电荷量越大,分辨率越好。束团间精确的相位依赖关系还可用于储存环束流尾场及阻抗的分析。 相似文献