Paper |
Title |
Page |
TUP002 |
Study of Robinson Instabilities with a Higher-Harmonic Cavity for HLS Phase II Project |
808 |
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- Y. Zhao, W. Li, L. Wang, C.-F. Wu
USTC/NSRL, Hefei, Anhui, People's Republic of China
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In the phase II project of Hefei Light Source, a fourth-harmonic “Landau” cavity will be operated in order to suppress coupled-bunch instabilities and increase the beam lifetime of Hefei Storage Ring. Instabilities limit the utility of the higher-harmonic cavity when the storage ring is operated with a small momentum compaction. Analytical modeling and simulations show that the instabilities result from Robinson mode coupling. In the analytic modeling, we operate an algorithm to consider Robinson instabilities. To study the evolution of unstable behavior, simulations have been performed in which macroparticles are distributed among the buckets. Both the analytic modeling and simulations agree for passive operation of the harmonic cavity.
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TUP145 |
Introduction to HLSII Storage Ring Conventional Magnets |
1100 |
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- H. Zhang, G. Feng, W.W. Li, W. Li, J.J. Liang, L. Wang, S.C. Zhang
USTC/NSRL, Hefei, Anhui, People's Republic of China
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HLS (Hefei Light Source) is a dedicated synchrotron radiation research facility, whose emittance is relatively large. In order to improve the performance of HLS, especially getting higher brilliance synchrotron radiation and increasing the number of straight section for insertion devices, an upgrade project named HLSII will be proceeded soon. The storage ring lattice comprises 8 dipoles, 32 quadrupoles and 32 combined function sextupoles. Design and analysis of the magnets are showed in the paper. the multipurpose combined function magnet is the first one designed and used in China. Mechanical design and fabrication procedures for the magnets are presented also.
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WEP090 |
Simulation Study of Intrabeam Scattering in Low Emittance Ring |
1639 |
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- W. Fan, G. Feng, D.H. He, W. Li, L. Wang, S.C. Zhang, T. Zhou
USTC/NSRL, Hefei, Anhui, People's Republic of China
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HALS(Hefei Advanced Light Source) is under designing dedicated to good coherence and high brightness at 1.5GeV. Low emittance is required to reach the design request. Due to the low energy and emittance with relative high bunch charge, intrabeam scattering effect will be very strong. It is worth accurately calculating to check if the design goal can be reached. Theoretic calculation based on Gaussian beam distribution doesn't warrant in strong IBS regime. In this paper we present the results of particle simulation study of intrabeam scattering effect on a temporary design lattice of HALS ring.
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WEP104 |
Transverse Feedback System and Instability Analysis at HLS |
1674 |
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- J.H. Wang, Y.B. Chen, W. Li, L. Liu, M. Meng, B.G. Sun, L. Wang, Y.L. Yang, Z.R. Zhou
USTC/NSRL, Hefei, Anhui, People's Republic of China
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In this paper, we introduce the BxB transverse feedback systems at Hefei Light Source (HLS), which employ an analog system and a digital system. The experiment result of two systems. as well as the primary analysis of beam instability in HLS injection and operation are also presented in this paper.
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