Design and verification of a high-gradient and high-power 2nd harmonic cavity for the China Spallation Neutron Source upgrade project

Wu, Benhong; Li, Xiao; Zhang, Chunlin; Liu, Yang; Wei, Long; Nie, Xiaojun; Li, Xiang; Wu, Jiawei; Zhu, Jianhui; Chen, Sheng-Yi; Liu, Shenghua; Lu, Z. H.; Wang, Sheng

doi:10.1063/5.0141079

Cited by 6 publications

(1 citation statement)

References 15 publications

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“…This technology was first validated at the KEK in Japan [6]. Recently, CSNS has also successfully developed such kind cavity and it has operated in the RCS ring for more than two years, with the cavity gradient reaching up to 50 kV/m [25,26]. This type of high-gradient magnetic alloy loaded cavity could potentially be applied to the CSNS-II FFAG accelerator in the future.…”

Section: Longitudinal Motion 41 Rf Parameters For Accelerationmentioning

confidence: 99%

Design and beam dynamics validation of a spiral FFAG accelerator for CSNS-II

Wu,

Zhou,

et al. 2024

J. Inst.

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The fixed-field alternating gradient (FFAG) accelerator, with its compact structure and the combined advantages of high energy from synchrotrons and high beam intensity from cyclotrons, offers unparalleled benefits in accelerating protons, heavy ions, and short-lived particles such as muons and unstable nuclei. The China Spallation Neutron Source plans to establish an FFAG accelerator with a diameter of 20 meters at the end of the negative hydrogen linac for various purposes, including experiments in nuclear physics and medical applications. For this design, a scaling scheme using spiral magnets as the basic focusing structure is investigated to provide the proton beam with kinetic energy ranging from 300 MeV to 600 MeV. We present the design results for the scaling FFAG accelerator and discuss the optimization of the cell tune. A detailed beam dynamics verification and discussion of the proposed FFAG accelerator lattice are presented using the ray-tracing code Zgoubi, including off-axis optical characteristics, large amplitude transverse motion, and full-cycle longitudinal acceleration. The FFAG accelerator is demonstrated to provide a large transverse and longitudinal acceptance for the tracking beam in the designed lattice. A new simulation code based on Python for the study of FFAG accelerator beam dynamics has been developed, and the corresponding verification results are also presented.

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Section: Longitudinal Motion 41 Rf Parameters For Accelerationmentioning

confidence: 99%

Design and beam dynamics validation of a spiral FFAG accelerator for CSNS-II

Wu,

Zhou,

et al. 2024

J. Inst.

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Design and commissioning of a wideband RF system for CSNS-II rapid-cycling synchrotron

Wu,

Li,

et al. 2024

NUCL SCI TECH

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CSNS-II multi-harmonic LLRF upgrade and commissioning

Li,

Wu,

et al. 2024

J. Inst.

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The second phase of the China Spallation Neutron Source (CSNS-II) will employ a dual-harmonic RF system to mitigate the significant space charge effects associated with 500 kW beam power. To address this, three magnetic alloy loaded cavities, characterized by their wideband and high-gradient properties, will be integrated as multi-harmonic cavities in the upgrade project. Additionally, the current LLRF control system hardware, based on the CPCI platform, is encountering issues related to discontinuation and performance limitations. This paper presents the testing and verification of hardware upgrades and multi-harmonic control system algorithms for the magnetic alloy loaded cavity LLRF control system, ensuring the effective implementation of the multi-harmonic control algorithm within the new hardware framework.

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Design and verification of a high-gradient and high-power 2nd harmonic cavity for the China Spallation Neutron Source upgrade project

Cited by 6 publications

References 15 publications

Design and beam dynamics validation of a spiral FFAG accelerator for CSNS-II

Design and beam dynamics validation of a spiral FFAG accelerator for CSNS-II

Design and commissioning of a wideband RF system for CSNS-II rapid-cycling synchrotron

CSNS-II multi-harmonic LLRF upgrade and commissioning

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