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Other Keywords |
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| WEP2PT021 |
The Design and Test of a Stripline Kicker for HEPS |
ion, kicker, simulation, injection |
117 |
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- H. Shi, J. Chen, L. Huo, P. Liu, X.L. Shi, G. Wang, L. Wang, N. Wang
IHEP, Beijing, People's Republic of China
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A fast stripline kicker is adopted for High Energy Photon Source (HEPS) on-axis injection. The optimization of a prototype 750 mm long kicker has been finished. The 3D simulation results show the final design of wide vane with end cover lowers the beam loss about 31% than the original design does. We develop a feedthrough model with machinable glass ceramic and achieve a VSWR under 1.3 in 0~2 GHz. The assembly of kicker and commercial feedthroughs has been tested with Keysight E5071C. The testing results of S parameters and TDR value show a good agreement with simulation ones.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-FLS2018-WEP2PT021
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| WEP2PT024 |
Influences of Harmonic Cavities on the Single-Bunch Instabilities in Electron Storage Rings |
ion, cavity, operation, storage-ring |
128 |
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- H.S. Xu, N. Wang
IHEP, Beijing, People's Republic of China
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Single-bunch instabilities usually determine the bunch performance at high charges as well as the highest single- bunch currents in storage rings. It has been demonstrated that the passive harmonic cavities, which have been widely used in electron storage rings of the third-generation synchrotron light sources, can generally make the beam more stable. However, the influences of the harmonic cavities on the single-bunch instabilities are still not fully understood. We hereby present our study of both longitudinal and transverse single-bunch instabilities when using different settings of the harmonic cavities.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-FLS2018-WEP2PT024
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| THP1WB02 |
Impedance Evaluation of PF In-Vacuum Undulator (IVU) with Theories and Simulations and Experimental Confirmation of them by the Tune Measurement |
ion, simulation, undulator, vacuum |
160 |
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- O. Tanaka, N. Nakamura, T. Obina, K. Tsuchiya
KEK, Ibaraki, Japan
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Four In-Vacuum Undulators (IVU) were recently installed to Photon Factory (PF) at KEK. The estimate of their impedance and kick factors is a very important issue, because they could considerably increase the total impedance of PF. Moreover, the coupling impedance of the IVUs could lead to the beam energy loss, changes in the bunch shape, betatron tune shifts and, finally, to the various beam instabilities. Using the simulation tool (CST Particle Studio), longitudinal and transverse impedances of the IVUs were evaluated and compared to analytical formulas and measurement results. The study provides guidelines for mitigation of unwanted impedance, for an accurate estimate of its effects on the beam quality and beam instabilities and for the impedance budget of a newly designed next-generation machine which has many IVUs and small-aperture beam pipes.
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Slides THP1WB02 [2.942 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-FLS2018-THP1WB02
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| FRA1PL02 |
Summary of Working Group B: Ring-Based Light Sources |
ion, emittance, lattice, injection |
202 |
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- R.P. Walker
DLS, Oxfordshire, United Kingdom
- Y. Li
BNL, Upton, Long Island, New York, USA
- Q. Qin
IHEP, Beijing, People's Republic of China
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This is the summary report of the ring-based light sources working group.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-FLS2018-FRA1PL02
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