Multipacting study of power couplers for the CSNS DTL

Fan, Meigong; Liu, Huachang; Li, Ahong; Wu, Xianxin; Wang, Yun; Qu, Peihua; Chen, Qiang; Li, Bo

doi:10.1016/j.nima.2019.163067

Cited by 2 publications

(2 citation statements)

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“…MP is a phenomenon in which electrons oscillate with the electromagnetic field and impact the surface of RF equipment, eventually leading to a sharp increase of electrons [17,18]. For the coaxial coupler, MP may cause copper sputtering of the inner or outer conductor and overheat of the ceramic window, all these phenomena finally lead to the break of the ceramic window with high probability.…”

Section: Multipacting Simulationmentioning

confidence: 99%

“…We can see that MP at outer and inner conductor are both soft barriers. Additionally, according to previous experience, some soft barriers are quite easy to be eliminated and cannot be observed during the conditioning; while other soft barriers with corresponding MP zones near the maximum SEY value will cause severe vacuum fluctuations, these zones are what needs to be found [17,21]. As shown in figure 11, strong MP zones of the outer and inner up section are about 55 ∼ 90 kW; in the taper section, strong MP zones of the outer and inner conductor are about 7 ∼ 43 kW; strong MP zones of the outer and inner down section are about 9 ∼ 24 kW.…”

Section: Multipacting Simulationmentioning

confidence: 99%

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Design of the input power coupler for Boron Neutron Capture Therapy Drift Tube Linac

et al. 2020

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An accelerator-based Boron Neutron Capture Therapy (BNCT) facility has been built at the campus of China Spallation Neutron Source (CSNS). To upgrade it, a Drift Tube Linac (DTL) is designed to provide a 40 mA, 25% duty factor, 10.1 MeV beam for the target. Two opposing power couplers are employed to deliver forward peak power up to 640 kW for the beam and DTL cavity. A new coaxial power coupler with a single Tristan type window is designed to meet the power and coupling coefficient requirements. In this paper, the detailed RF optimization process of the coupler is described. According to the RF simulation results, the multipacting (MP) phenomenon at critical locations is simulated by the CST PS (Particle Studio). Simulations of thermal and mechanical are also carried out, the cooling design to provide a large margin for RF heating is performed based on the simulation results.

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Section: Multipacting Simulationmentioning

confidence: 99%

Section: Multipacting Simulationmentioning

confidence: 99%