Impedances and beam instability in RCS/CSNS

Yudong, 刘瑜冬 Liu; Liangsheng, 黄良生 Huang; Sheng, 王生 Wang; Na, 王娜 Wang; Yong, 李勇 Li

doi:10.3788/hplpb20132502.0465

Cited by 3 publications

(3 citation statements)

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“…Two types of the stainless-steel chambers (304 and 316L) are utilized in the RCS and their impedance is calculated in Ref [3]. It should be noted that a permeability of μr=55 was used for magnetic shielding against the leak field in a special region, which is actually closed to 1 in the RCS.…”

Section: Stainless-steel Chambermentioning

confidence: 99%

“…At present, the beam power has reached 140 kW with an intensity of 2.18 × 10 13 , 40 % more than the nominal power. An impedance model has been provided in the Ref [3], and new vacuum components have been installed in the RCS to enhance beam power, such as the installation of a magnetic alloy cavity as the second harmonic cavity in summary 2022. During beam commissioning, a fast oscillation of beam position in the transverse plane was observed [4], prompting a re-investigation of the impedance to identify the source of the instability.…”

Section: Introductionmentioning

confidence: 99%

“…During beam commissioning, a fast oscillation of beam position in the transverse plane was observed [4], prompting a re-investigation of the impedance to identify the source of the instability. This paper presents the key upgrade of the coupling impedance based on the existing model [3]. A new impedance model in the RCS is obtained.…”

Section: Introductionmentioning

confidence: 99%

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Upgrade the impedance model in RCS of CSNS

Huang,

Liu,

Rao

et al. 2024

J. Phys.: Conf. Ser.

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The Rapid Cycling Synchrotron (RCS) in the China Spallation Neutron Source (CSNS) is a high-intensity proton accelerator that is susceptible to collective instabilities and performance limitations due to its impedance. With impedance study of key components and new component installations, the impedance model should be updated. This article presents a comprehensive estimate of the coupling impedance and outlines the impedance model of the RCS.

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Section: Stainless-steel Chambermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Upgrade the impedance model in RCS of CSNS

Huang,

Liu,

Rao

et al. 2024

J. Phys.: Conf. Ser.

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Impedance measurements of the extraction kicker system for the rapid cycling synchrotron of China Spallation Neutron Source

et al. 2016

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The Rapid Cycling Synchrotron (RCS) of China Spallation Neutron Source (CSNS) includes eight modules of the ferrite kicker magnets with window-frame geometry. The fast extraction kicker system is one of the most important accelerator components, whose inner structure will be the main source of the impedance in the RCS. It is necessary to understand the kicker impedance before its installation into the tunnel. The conventional and improved wire methods are employed for the benchmarking impedance measurement results. The experimental result on the kicker's impedance is explained by comparison with the CST PARTICLE STUDIO simulation. The simulation and measurements confirm that the window-frame ferrite geometry and the end plate are the important structures causing the coupling impedance. It is proved in the measurements that the mismatching among the long cable, the termination and the power form network lead a serious oscillation sideband in the longitudinal and vertical impedance, which can be restricted by the ferrite absorb ring. The total impedance of the eight modules systems is determined by the scaling law from the measurement and the impedance measurement of the kicker system is summarized.

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