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A preliminary quadrupole asymmetry study of a β=0.12 superconducting single spoke cavity

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Chinese Physics C 2014年第10期38卷 69-73页

作者：杨自钦鲁向阳杨柳罗星周奎全胜文 State Key Laboratory of Nuclear Physics and Technology Peking University

An Accelerator Driven System（ADS） has been launched in China for nuclear waste transmutation. For the application of high intensity proton beam acceleration, the quadrupole asymmetry effect needs to be carefully evaluated for cavities. Single spoke cavities are the main accelerating structures in the low energy front-end. The single spoke cavity has small transverse electromagnetic field asymmetry, which may lead to transverse RF defocusing asymmetry and beam envelope asymmetry. A superconducting single spoke resonator（PKU-2 spoke） of β=0.12 and f =325 MHz with a racetrack-shaped inner conductor has been designed at Peking university. The study of its RF field quadrupole asymmetry and its effect on transverse momentum change has been performed. The quadrupole asymmetry study has also been performed on a β=0.12 and f =325 MHz ring-shaped single spoke cavity. Our results show that the quadrupole asymmetry is very small for both the racetrack-shaped and the ring-shaped single spoke cavity.

关键词： spoke cavity quadrupole asymmetry transverse momentum change

Design of a 450 MHz β=0.2 single spoke cavity at PKU

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Chinese Physics C 2009年第4期33卷 292-296页

作者：姚中元鲁向阳赵夔 State Key Laboratory of Nuclear Physics and Technology Peking University

The design of a 450 MHz β=0.2 superconducting single spoke cavity has been finished at Peking University. A theoretical model and a numerical simulation are used to study the relationship between the RF performance and the geometric parameters of the cavity. In this paper, the optimization of the spoke cavity is described in detail. The RF simulation gives the optimum parameters Epk/Zacc of 2.65 and Bpk/Eacc of 5.22 mT/（MV/m）. The mechanical properties of the cavity are also studied. Two stiff ribs are used to offer a credible mechanical stability.

关键词： spoke cavity low and medium β superconducting linear accelerator

Study on the HOMs coupler design of spoke cavity

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Chinese Physics C 2011年第2期35卷 188-192页

作者：肖永川殷学军慕振成傅世年 Institute of High Energy Physic CAS

The superconducting spoke cavity has been proposed to accelerate the proton in the low energy section of high power proton linac for an Accelerator Driven Sub-critical System （ADS）. Considering that the High Order Modes （HOMs） in the superconducting cavity have far reaching influence on power dissipation and beam stability, the analysis of HOMs of the spoke cavity is needed. In this paper, we put emphasis on the analysis of HOMs of the spoke cavity and the HOMs coupler design.

关键词： HOMs spoke cavity ADS

Tuner control system of spoke012 SRF cavity for C-ADS injector I

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Chinese Physics C 2016年第9期40卷 138-143页

作者：刘娜孙毅王光伟米正辉林海英王群要刘熔马新朋 University of Chinese Academy of Sciences Beijing 100039China Institute of High Energy Physics CASBeijing 100049China

A new tuner control system for spoke superconducting radio frequency（SRF） cavities has been developed and applied to cryomodule I of the C-ADS injector I at the Institute of High Energy Physics, Chinese Academy of Sciences. We have successfully implemented the tuner controller based on Programmable Logic Controller（PLC）for the first time and achieved a cavity tuning phase error of ±0.7？（about ±4 Hz peak to peak） in the presence of electromechanical coupled resonance. This paper presents preliminary experimental results based on the PLC tuner controller under proton beam commissioning.

关键词： tuner control spoke cavity PLC

Commissioning experiences with the spoke-based CW superconducting proton linac

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Nuclear Science and Techniques 2021年第10期32卷 12-29页

作者： Fang Yan Hui-Ping Geng Cai Meng Ya-Liang Zhao Hua Shi Hua-Fu Ouyang Tong-Min Huang Fei-Si He Jian-Li Wang Rui Ge Yan-Feng Sui Qiang Ye Rong Liu Qun-Yao Wang Sheng-Chang Wang Jian-She Cao Wei-Min Pan Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy Physics(IHEP)Chinese Academy of ScienceBeijing 100049China Beijing Normal University Beijing 100875China

The 10-MeV Accelerator-Driven Subcritical(ADS)system Injector-I test stand at the Institute of High Energy Physics(IHEP)is a testing facility dedicated to demonstrating the feasibility of the spoke-based super-conducting(SC)linear accelerator(linac)for the ADS project in *** injector adopted a four-vane copper structure radio frequency quadrupole(RFQ)with an output energy of 3.2 MeV and an SC section accommodating 14 β_(g)=0.12 single spoke cavities,14 SC solenoids,and 14 cold beam position monitors(BPMs).A 10-MeV pulsed beam with a beam current of 10 mA and a 2-mA continuous wave(CW)beam were successfully shooting *** commissioning results confirmed the feasibility of using a 325-MHz spoke-type cavity for accelerating the proton beam in the low β and medium β *** paper describes the results achieved,the difficulties encountered,and the experiences obtained during commissioning.

关键词： Superconducting proton linac spoke cavity High intensity CW commissioning

MTCA.4-based LLRF control system for the C-ADS proton Linac injector I

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Radiation Detection Technology and Methods 2017年第1期1卷 13-20页

作者： R.Liu X.P.Ma N.Gan H.Y.Lin Q.Y.Wang Z.H.Mi S.Z.Wang X.F.Huang Yan Wu G.W.Wang Y.L.Chi Weimin Pan Key Laboratory of Particle Acceleration Physics and Technology IHEPCASBeijing 100049China

Objective:The Chinese ADS proton Linac injector I composed of an electron cyclotron resonance ion source,a lowenergy beam transport line,a radio frequency quadrupole(RFQ)accelerator,a medium-energy beam transport(MEBT)line,a superconducting section and beam dump with design goal to achieve CW proton beam with beam current 10 mA and energy gain around 10 *** order to maintain the stability of the RF system,to compensate for the beam load effect and to provide the GUI required for the operation of the RF power system,we have established a LLRF control ***:This LLRF system for ADS proton Linac injector I in IHEP consists of RF reference system and LLRF controllers for oneRFQcavity,twoMEBTbunching cavities and 14 superconductive spoke *** have adopted a new development mTCA.4-based hardware platform,and it has some characteristics such as faster bandwidth,standardized design,easy operation and maintenance and good ***:The LLRF system has been improved and optimized and has now been put into *** takes into account the pulse and CW beam flow mode,feedforward and feedback control ***:With the help of this system,we achieved stable operationwith narrowpulses,long pulses,andCWmodes under different beam *** article describes the implementation of this system and presents some initial the CW beam acceleration results with the help of this system at the end of 2016.

关键词： RF system RFQ spoke cavity LLRF MTCA.4 CW proton beam