| Paper | Title | Page |
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| MOPAN053 | Development of Transverse Feedback System and Instabilities Suppress at HLS | 269 |
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| In order to cure and damp coupled bunch (CB) instabilities, a transverse bunch-by-bunch feedback system is under commission at Hefei Light Source (HLS). In this paper, we introduce the HLS Bunch-by-Bunch measurement system and transverse feedback system. The experiment result in HLS ring is also presented in this paper. | ||
| MOPAN054 | Beam Instabilities Measurement and Cures at HLS | 272 |
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| In Hefei Light Source (HLS), coupled-bunch instabilities are major limiting factors in achieving higher beam intensity while maintaining good beam quality. To Measure and suppress beam instabilities, turn-by-turn (TBT) measurement and bunch-by-bunch(BxB) measurement & feedback system are under commission [1][2]. The design of the two systems and primary experiment results is presented. Measurement and detail analysing results in injection status will also be shown. | ||
| MOPAN055 | Bunch-by-Bunch Measurement and Feedback System of HLS | 275 |
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Funding: Supported by National Natural Science Project (10175063); National Natural Science Key Project (10535040) In this paper, HLS (Hefei light Source) bunch-by-bunch measurement and feedback system will be introduced. This system is integrated with longitudinal oscillation measurement system, fast vector control, fiber notch filter and bunch current detection system. The detail of the two fronts will be shown. Some experimental results by this system are also present in this paper, as phase-space tracing, mode dumping rate, and feedback experiments. |
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| TUPMN058 | The Operation Status of HLS (Hefei Light Source) | 1058 |
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| National Synchrotron Radiation Lab, University of Science and Technology of China, P. R.China HLS(Hefei Light Source) is a dedicated synchrotron radiation research facility, spectrally strongest in Vacuum Ultra Violet and Soft X-ray. Designed and constructed in 1980's, accepted to regular service in 1991. From 1999 to 2004, the National Synchrotron Radiation Lab carried out its Phase II Project, in which quite a few sub-systems of HLS storage ring were upgraded and 8 new beamline were constructed. After the project, the performance of HLS is improved considerably. In this paper, the operation status and performance of storage ring in recent years were presented. With some measures, the operation beam intensity is about 300mA, beam lifetime is higher than before, orbit stability is met requirement of users, and the capability to provide synchrotron radiation exceeds the design value. | ||
| TUPMN059 | The Nonlinear Effects of Fringe Fields in HLS | 1061 |
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| As a small low energy electron storage ring, the fringe field effects on linear and nonlinear properties maybe can not be ignored. In this paper, the fringe field of dipole magnets and quadrupole magnets on linear optics parameters and nonlinear driving terms of general purpose operation mode in HLS storage ring were analyzed and calculated. The results showed that, for GPLS mode, the fringe field of dipole and quadrupole is the main source of tune shift with amplitude. The fringe field of dipole contributes non-ignorable part to vertical chromaticity. Similar behavour is also displayed in non linear driving terms. | ||
| TUPMN060 | A Low Emittance Lattice Design for HLS Storage Ring | 1064 |
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| Lower beam emittance is the most effective measure to higher brilliance of light source. To enhance performance of HLS ring, a new low emittance lattice was studied and introduced in this paper. The scale of new lattice is designed according to the current ground settlement of HLS ring, but the focusing structure and mangets were changed. The new designed lattice has two operation mode, low emittance mode and low momentum compaction mode. In this paper, the linear lattice function and dynamic aperutre of the new designed lattice was briefly introduced. Caculation results showed that, after upgrade, the brilliance of HLS storage ring can approach the level of third order light source. | ||
| TUPMN061 | An Upgrade Proposal of Injection Bump System for HLS | 1067 |
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| The current injection bump system of Hefei Light Source was designed eight years ago, and operated five years ago. In this paper, the advantages and shortcomings of current bump system were analyzed, and reasonalbe design objective was summed up. According to new design goal, a new physical design of bump system for HLS ring was completed. The acceptance of injected beam and perturbation on stored beam were analyzed. At same time, the ELEGANT software was used to simulate the injection process under new designed bump system. The results showed that, with new designed bump system, the injection rate would be higher than 90%, and the perturbation on orbit of stored beam would be small enough. | ||
| THPAN055 | Theoretical Study of Medium Emittance Lattice at HLS | 3351 |
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Funding: Supported by National Natural Science Foundation of China, No. 10175062 & No.17175100
A method of injection analysis of small electron storage ring is introduced, and several medium emittance lattices are proposed. By analyzing the injection, working point of the lattice is selected at the vicinity of half integer resonance lines, and emittance is around 60nmrad, the linear and nonlinear properties can be satisfied for injection and store.
LIU Zu-Ping, Li Wei-Min. Progress of the NSRL Phase Two Project. In proceedings of the Second Asia Particle Accelerator Conference, Beijing, China, 2001, 235-238 |