Beam breakup simulation study for a high energy ERL

Chen, Si; Shimada, Miho; Nakamura, Norio; Huang, Senlin; Liu, Kexin; Chen, Jiaer

doi:10.1088/1674-1137/39/1/017006

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…4. For the ERL-LS, the design value of the average electron beam current is a few 10 mA, which is limited in the threshold current due to beam breakup caused by higher order modes (HOM-BBU) [29][30][31][32][33]. In order to increase the threshold current, the ERL-booster energy is designed to a few 10 MeV, which is larger than the other ERL projects [13,14].…”

Section: A Beam Energy and Currentmentioning

confidence: 99%

Lattice layout and linear optics for sharing superconducting linac

Shimada

2019

Phys. Rev. Accel. Beams

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A superconducting (SC) linac allows a few orders of magnitude larger average beam current than a normal conducting linac, therefore the powerful beam is expected to lead to outstanding discoveries in various scientific fields, such as high luminosity accelerators and high brilliance light source. However, the high construction and operation costs of the SC linac is a critical issue for realizing large scale facilities. To resolve this problem, we propose a continuous wave (cw) operation of an SC linac shared by electron/ positron beams for effective multipurpose utilization. A high current positron source is required for high-energy physics projects: a linear electron-positron collider and a muon collider, while high-current and high-quality electron beams are expected to realize the high brilliant x-ray light sources. As an example, we discuss the injector of the International Linear Collider, an x-ray free-electron laser, and an energy-recovery linac light source. We found a feasible solution of a basic design for the proposed multibeam operation despite the high-quality beam requirements and complicated operation: control of mixed beams without pulsed magnets, and heat load in the cavity, high stability of beam energy, and operation at high average current.

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Section: A Beam Energy and Currentmentioning

confidence: 99%

Lattice layout and linear optics for sharing superconducting linac

Shimada

2019

Phys. Rev. Accel. Beams

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“…Higher-order modes (HOMs) will be excited when electron beam passes through the radio-frequency (rf) cavity, which is one of the main causes of emittance dilution [1] and beam current limit in a superconducting rf (SRF) cavity [2][3][4]. For TESLA cavity, two coaxial type couplers are therefore installed on both ends of the cavity with a specific orientation to extract HOMs and transfer the power to the load [5].…”

Section: Introductionmentioning

confidence: 99%

Electron bunch train excited higher-order modes in a superconducting RF cavity

Gao¹,

Huang²,

Fang³

et al. 2017

Chinese Phys. C

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Higher-order mode (HOM) based intra-cavity beam diagnostics has been proved effectively and conveniently in superconducting radio-frequency (SRF) accelerators. Our recent research shows that the beam harmonics in the bunch train excited HOM spectrum, which have much higher signal-to-noise ratio than the intrinsic HOM peaks, may also be useful for beam diagnostics. In this paper, we will present our study on bunch train excited HOMs, including the theoretic model and recent experiments carried out based on the DC-SRF photoinjector and SRF linac at Peking University.

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Beam breakup simulation study for a high energy ERL

Abstract: Sen-Lin( ) 2;1) LIU Ke-Xin( ) 2;2) CHEN Jia-Er( ) 1,2

Cited by 2 publications

References 7 publications

Lattice layout and linear optics for sharing superconducting linac

Lattice layout and linear optics for sharing superconducting linac

Electron bunch train excited higher-order modes in a superconducting RF cavity

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