Preliminary study of the higher-harmonic cavity for HLS- II

Wu, Cong-Feng; Fan, Hong-Yi; Wang, Lin; Liu, Guangchao; Gao, Feng; Liu, Weimin; Bosch, Robert

doi:10.1088/1674-1137/36/9/017

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…For a tuning angle with the range from −83.40 • to −89.80 • the parasitic coupled-bunch instability is predicted to occur before optimal bunch lengthening is obtained. The results are in good agreement with those from our previous simulations in which an optimal bunch lengthening curve described by parameters of tuning angle and current is obtained and along this curve, the natural relative energy spread is not predicted [4]. Our simulation also shows that the energy spread exceeds its natural value by 10%-30% before optimal bunch lengthening is obtained.…”

Section: Parasitic Coupled-bunch Instability Modelingsupporting

confidence: 90%

Analytic modeling of instabilities driven by higher-order modes in the HLS II RF system with a higher-harmonic cavity

Zhao¹,

Li²,

Wu³

et al. 2013

Chinese Phys. C

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The utility of a passive fourth-harmonic cavity plays key role in suppressing longitudinal beam instabilities in the electron storage ring and lengthens the bunch by a factor of 2.6 for the phase II project of Hefei Light Source(HLS II). Meanwhile, instabilities driven by higher-order modes(HOM) may limit the performance of the higher-harmonic cavity. In this paper, the parasitic coupled-bunch instability which is driven by narrow band parasitic modes and the microwave instability which is driven by broadband HOM are both modeled analytically. The analytic modeling results are in good agreement with that of our previous simulation study and indicate that the passive fourth-harmonic cavity suppresses parasitic coupled-bunch instabilities and the microwave instability. The modeling suggests that a fourth-harmonic cavity may be successfully used at HLS II.

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Section: Parasitic Coupled-bunch Instability Modelingsupporting

confidence: 90%

Analytic modeling of instabilities driven by higher-order modes in the HLS II RF system with a higher-harmonic cavity

Zhao¹,

Li²,

Wu³

et al. 2013

Chinese Phys. C

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“…For HLS , we use the parameters [5] shown in Table 1. The harmonic cavity impedance and Q factor are estimated respectively for the 4th harmonic cavities.…”

Section: Analytic Modelingmentioning

confidence: 99%

Study of Robinson instabilities with a higher-harmonic cavity for the HLS phase II project

Zhao¹,

Yuning²,

Wu³

et al. 2012

Chinese Phys. C

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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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Particle Accelerators in China

Zhang

Fang

2016

Rev. Accl. Sci. Tech.

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As the special machines that can accelerate charged particle beams to high energy by using electromagnetic fields, particle accelerators have been widely applied in scientific research and various areas of society. The development of particle accelerators in China started in the early 1950s. After a brief review of the history of accelerators, this article describes in the following sections: particle colliders, heavy-ion accelerators, high-intensity proton accelerators, accelerator-based light sources, pulsed power accelerators, small scale accelerators, accelerators for applications, accelerator technology development and advanced accelerator concepts. The prospects of particle accelerators in China are also presented.

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Preliminary study of the higher-harmonic cavity for HLS- II

Cited by 3 publications

References 4 publications

Analytic modeling of instabilities driven by higher-order modes in the HLS II RF system with a higher-harmonic cavity

Analytic modeling of instabilities driven by higher-order modes in the HLS II RF system with a higher-harmonic cavity

Study of Robinson instabilities with a higher-harmonic cavity for the HLS phase II project

Particle Accelerators in China

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