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Intra-beam scattering and beam lifetime in a candidate lattice of the soft X-ray diffraction-limited storage ring for the upgraded SSRF

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Nuclear Science and Techniques 2021年第8期32卷 57-66页

作者： Xin-Zhong Liu Shun-Qiang Tian Xu Wu Meng Wang Zhen-Tang Zhao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China Shanghai University Shanghai 200444China

New-generation synchrotron light sources are being designed and operated worldwide to provide brighter radiation by reducing the beam emittance to X-ray diffraction ***-beam scattering(IBS)and Touschek scattering in such facilities are significant and require attention because of their ultra-low ***,cure strategies need to be carefully studied to obtain highquality photon *** the Shanghai Synchrotron Radiation Facility Upgrade(SSRF-U),a candidate lattice of the storage ring,reaching the soft X-ray diffraction limit,was designed and presented for the first time in this *** emittance growth and beam lifetime in the SSRF-U storage ring were studied using particle simulations for a series of different machine *** gains with RF frequencies of 100 MHz and 500 MHz were *** with a better filling pattern,a more suitable RF frequency was adopted in the *** variations in the equilibrium beam emittance with beam coupling and bunch-lengthening were identified using *** beam coupling and required bunch-lengthening for the SSRF-U storage ring were thus *** fitness of the beam energy in the SSRF-U was subsequently assessed using the obtained ***,the Touschek scattering and beam lifetime were calculated,and an acceptable total beam lifetime was obtained.

关键词： Diffraction-Limited Storage Ring(DLSR) Shanghai Synchrotron Radiation Facility Upgrade(SSRFU) Intra-beam Scattering(IBS) Touschek scattering beam lifetime

Simulation of beam gas coulomb scattering in HALS

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Chinese Physics C 2015年第2期39卷 77-82页

作者：于路新高巍巍王琳李为民 NSRL School of Nuclear Science and TechnologyUniversity of Science and Technology of China

In conventional research on beam gas coulomb scattering （BGCS）, only the related beam lifetime using the analytical method is studied. In this paper, using the particle-in-cell Monte Carlo collisions （PIC-MCC） method, we not only simulated the beam lifetime but also explored the effect of BGCS on the beam distribution. In order to better estimate the effect on particle distribution, we study the ultra-low emittance electron beam. Here we choose the HeFei Advanced Light Source. By counting the lost particles in a certain time, the corresponding beam lifetime we simulated is 4.8482 h/13.8492 h in x/y, which is very close to the theoretic value （5.0555 h/13.7024 h in x/y）. By counting the lost particles relative to the collided particles, the simulated value of the loss probability of collided particles is 1.3431e-04, which is also very close to the theoretical value （1.3824e-04）. Besides, the simulation shows there is a tail in the transverse distribution due to the BGCS. The close match of the simulation with the theoretic value in beam lifetime and loss probability indicates our simulation is reliable.

关键词： beam gas coulomb scattering elastic collision formula beam lifetime beam distribution

Analysis and correction of linear optics errors,and operational improvements in the Indus-2 storage ring

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Chinese Physics C 2017年第8期41卷 130-142页

作者： Riyasat Husain A.D.Ghodke Accelerator Physics Section Raja Ramanna Centre for Advanced TechnologyIndore452013India Homi Bhabha National Institute Training School ComplexAnushakti NagarMumbai 400094India

Estimation and correction of the optics errors in an operational storage ring is always vital to achieve the design performance. To achieve this task, the most suitable and widely used technique, called linear optics from closed orbit（LOCO） is used in almost all storage ring based synchrotron radiation sources. In this technique, based on the response matrix fit, errors in the quadrupole strengths, beam position monitor（BPM） gains, orbit corrector calibration factors etc. can be obtained. For correction of the optics, suitable changes in the quadrupole strengths can be applied through the driving currents of the quadrupole power supplies to achieve the desired optics. The LOCO code has been used at the Indus-2 storage ring for the first time. The estimation of linear beam optics errors and their correction to minimize the distortion of linear beam dynamical parameters by using the installed number of quadrupole power supplies is discussed. After the optics correction, the performance of the storage ring is improved in terms of better beam injection/accumulation, reduced beam loss during energy ramping, and improvement in beam lifetime. It is also useful in controlling the leakage in the orbit bump required for machine studies or for commissioning of new beamlines.

关键词： LOCO code beta-beat betatron coupling beam lifetime Indus-2 storage ring

Theoretical analysis of BLM system for HLS Ⅱ

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Chinese Physics C 2015年第1期39卷 83-86页

作者：陈裕凯李裕熊李为民何丽娟 National Synchrotron Radiation Laboratory University of Science and Technology of China

Hefei Light Source （HLS） is being upgraded to HLS Ⅱ. Its emittance will be much lower than before, therefore the Touschek scattering will increase significantly and become the dominant factor of beam loss. So it is necessary to build a new beam loss monitoring （BLM） system that, in contrast to the old one, is able to obtain the quantity and position information of lost electrons. This information is useful in the commissioning, troubleshooting, and beam lifetime studying for HLS Ⅱ. This paper analyzes the distribution features of different kinds of lost electrons, introduces the operation parameters of the new machine and discusses how to choose proper monitoring positions. Based on these comprehensive analyses, a new BLM system for HLS Ⅱ is proposed.

关键词： storage ring beam loss beam lifetime Touschek lifetime

beam Loss Monitoring System of BEPCⅡ and Its First Application

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Chinese Physics C 2008年第Z1期32卷 80-82页

作者：赵晓岩曹建社汪林岳军会叶强随艳峰赵颖麻惠州赵静霞张国庆赵政张磊中国科学院高能物理研究所北京100049

The beam lifetime is an important parameter and it can affect the operation of the storage *** using the beam loss monitoring system,it can provide some explanation for the beam loss,to Optimize the machine parameters and to further increase the beam *** this article,a beam loss detecting system for BEPCⅡis *** system is composed of the front-end electronics,the CAN bus and ***,the first application of the beam loss detection system for BEPCⅡis presented too.

关键词： beam loss beam lifetime CAN bus