Development of the Impedance Model in HEPS

Wang, Na; Duan, Zhe; Li, Xiao Yu; Shi, Hua; Tian, Saike; Xu, Gang

doi:10.18429/jacow-ipac2017-wepik078

Cited by 2 publications

(2 citation statements)

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“…However, the beam energy density reduction induced by the pre-kicker is designed to be significant (by a factor of 1/100 to 1/20), and the simulated maximum deposition density after the pre-kick was only slightly affected when the IDs were excluded. In addition, longitudinal and vertical impedances are modeled with a ZLONGIT element and a ZTRANSVERSE element, using the established impedance model [20]. However, the horizontal impedance model is not yet available and is not included in the following simulations.…”

Section: Parameter Choices Of the Pre-kicker Systemmentioning

confidence: 99%

Using a pre-kicker to ensure safe extractions from the HEPS storage ring

et al. 2021

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The High Energy Photon Source (HEPS) is a 6 GeV diffraction-limited storage ring light source under construction. The swap-out injection is adopted with the depleted bunch recycled via high-energy accumulation in the booster. The extremely high beam energy density of the bunches with an ultra-low emittance (about 30 pm horizontally and 3 pm vertically) and high bunch charges (from 1.33 to 14.4 nC) extracted from the storage ring could cause hazardous damage to the extraction Lambertson magnet in case of extraction kicker failure. To this end, we proposed the use of a pre-kicker to spoil the bunches prior to extraction, significantly reducing the maximum beam energy density down to within a safe region while still maintaining highly efficient extractions. The main parameters of the pre-kicker are simulated and discussed.

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Section: Parameter Choices Of the Pre-kicker Systemmentioning

confidence: 99%

Using a pre-kicker to ensure safe extractions from the HEPS storage ring

et al. 2021

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“…The High Energy Photon Source (HEPS) is a fourth generation light source with beam energy of 6 GeV [1][2][3]. A large quantity of undulators with small magnetic gap will be installed in the storage ring [4,5] and make an important contribution, either to the resistive wall impedance or to the geometric impedance [6]. Regarding the geometric impedance, most of the studies focus on the in-vacuum undulators (IVUs).…”

Section: Introductionmentioning

confidence: 99%

Impedance of in-air undulator vacuum chamber in HEPS

Li,

Wang,

Yue

et al. 2023

J. Inst.

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Undulators with small gap have been widely used in various light sources all over the world for the demand of high brilliance. A large number of in-air undulators with small gap will be installed in the storage ring of the High Energy Photon Source, and become one of the important impedance contributors. Antechambers are adopted for the bypass of the synchrotron radiations, as well as to reach high vacuum in the beam pipe with small aperture. Due to the asymmetric structure of the vacuum chamber, monopole wakefield in the transverse planes will be excited by the beam passage. In addition, photon absorbers will be installed in the vacuum chamber of the in-air undulators to shield the downstream components, which will introduce extra resonances in the transverse planes. In this paper, a series of numerical simulations are performed to investigate the impedance of the in-air undulator vacuum chamber. The high order modes generated by the photon absorber and their mitigations are also investigated.

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Development of the Impedance Model in HEPS

Cited by 2 publications

References 0 publications

Using a pre-kicker to ensure safe extractions from the HEPS storage ring

Using a pre-kicker to ensure safe extractions from the HEPS storage ring

Impedance of in-air undulator vacuum chamber in HEPS

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