RF structure design of the China Material Irradiation Facility RFQ

Li, Chenxing; He, Yuan; Xu, Xianbo; Zhang, Zhouli; Wang, Fengfeng; Dou, Weiping; Wang, Zhijun; Wang, Tieshan

doi:10.1016/j.nima.2017.06.045

Cited by 15 publications

(10 citation statements)

References 7 publications

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“…Currently, the main cavity types of RFQ are four-vane RFQ [17][18][19] and four-rod RFQ [20][21][22]. The four-vane RFQ is suitable for accelerating light particles, such as protons and deuterons, and can operate under continuous-wave (CW) conditions.…”

Section: Selection Of Cavitymentioning

confidence: 99%

Design of a 200-MHz Continuous-Wave Radio Frequency Quadrupole Accelerator for Boron Neutron Capture Therapy

Gao,

Lu,

Xing

et al. 2021

Preprint

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A high-intensity continuous wave (CW) radio frequency quadrupole (RFQ) accelerator is designed for boron neutron capture therapy (BNCT). The transmission efficiency of a 20-mA proton beam accelerated from 30 keV to 2.5 MeV can reach 98.7% at an operating frequency of 200 MHz. The beam dynamics has good tolerance to errors. By comparing the high-frequency parameters of quadrilateral and octagonal RFQ cross-sections, the quadrilateral structure of the four-vane cavity is selected owing to its multiple advantages, such as a smaller cross section at the same frequency and easy processing. In addition, tuners and undercuts are designed to tune the frequency of the cavity and achieve a flat electric field distribution along the cavity. In this paper, the beam dynamics simulation and electromagnetic design are presented in detail.

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Section: Selection Of Cavitymentioning

confidence: 99%

Design of a 200-MHz Continuous-Wave Radio Frequency Quadrupole Accelerator for Boron Neutron Capture Therapy

Gao,

Lu,

Xing

et al. 2021

Preprint

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show abstract

“…In addition, one hour of stable cw operation has been successfully demonstrated, which accelerated the cw hydrogen (H + 2 ) beam of 1.5-2 mA to 1.04 MeV with the transmission efficiency over 90% [6]. Based on the successful commissioning of this cw RFQ and experience from other cw RFQs [7][8][9][10], the following design considerations have been adopted to ensure high availability and reliability of the BISOL RFQ.…”

Section: Design Strategy and Considerationsmentioning

confidence: 99%

Design and study of a continuous wave RFQ for the BISOL high intensity deuteron driver linac

Li¹,

Wang²,

Lu³

et al. 2020

J. Inst.

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A high intensity four-vane continue wave (cw) RFQ for the Beijing Isotope Separation On-Line (BISOL) high intensity deuteron driver linac has been designed. This RFQ will accelerate the 25 mA cw deuteron beam the 3.0 MeV with an operating frequency of 162.5 MHz. Three beam dynamics design schemes based on different strategies have been proposed and detailed comparisons, including tolerance study and error analysis, are performed to evaluate them. The final design of RFQ can achieve the requirements with a length of 5.29 m and the transmission of 99.1%. The inter-vane voltage is ramped from 60 kV to 75 kV and the maximum Kilpatrick factor is 1.42, which is very modest and beneficial to cw operation mode. The RFQ electromagnetic design is carried out based on the full-length 3D model, including vane modulation, undercuts, π-mode stabilization rods (PSLs) and tuners. The requirements of correct work frequency and voltage ramp are fulfilled by varying vane width and adjusting undercuts. In addition, the π-mode stabilization rods (PSLs) are inserted and optimized to increase mode separation and enhance voltage stabilization. The rf power loss and effective shunt impendence are 118 kW and 210 kΩ⋅m, respectively. In addition, multi-physics analysis of the cavity, based on the electromagnetic codes CST MWS, HFSS and ANSYS, has been carried out to check the cooling system, the temperature rise and deformation of the cavity, as well as the frequency shift in the cw operation. Finally, the frequency sensitivities to cooling water temperature are studied to obtain water temperature tuning coefficients, which will be used for fine tuning of the RFQ cavity during operation.

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“…Enhanced dipole-to-quadrupole mode separation can make the RFQ less sensitive to dimensional construction errors and strengthen its field stabilization [24]. Various methods have been devised to increase the mode separation, including vane coupling rings [25], dipole separation rods (DSR) [26,27], π-mode stabilizer loops (PISL) [28,29] and asymmetric four-vane RFQ [30]. However, these are mechanically complicated to implement and may induce multipacting effects.…”

Section: Double-dipole Four-vane Structurementioning

confidence: 99%

Novel deuteron RFQ design with trapezoidal electrodes and double dipole four-vane structure

Wang

et al. 2020

J. Inst.

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RF structure design of the China Material Irradiation Facility RFQ

Cited by 15 publications

References 7 publications

Design of a 200-MHz Continuous-Wave Radio Frequency Quadrupole Accelerator for Boron Neutron Capture Therapy

Design of a 200-MHz Continuous-Wave Radio Frequency Quadrupole Accelerator for Boron Neutron Capture Therapy

Design and study of a continuous wave RFQ for the BISOL high intensity deuteron driver linac

Novel deuteron RFQ design with trapezoidal electrodes and double dipole four-vane structure

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