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| 1 | 6-11 Status of the Electro-polishing System at IMP显示文摘Institution of Modern Physics (IMP) has designed, fabricated and installed the first SRF cavity electropolishing system of China. It’s sized for 1.3 GHz SRF cavities, and also can works for multiple cell cavities with further upgrade of structure. | Li Lu He Yuan You Zhiming Guo Hao Xiong Pingran Zhu Xinlong Li Yongming Zhang Shenghu Zhang Bin Shi Zhixiong | 2015 | IMP & HIRFL Annual Report2015，，1： | 0 |
| 2 | 射频超导腔体在线清洗显示文摘In 2018,detailed studies on RF induced plasma for the in-situ cleaning of the HWR cavity were conducted to improve the performance of the cavity.For the purpose of cleaning the HWR cavities in cryomodule,an apparatus for the discharge experiments was designed at room temperature,which duplicates the assembly of cavities inside cryomodule,where the FPC was used for power coupling. | Wu Andong Huang Shichun Yang Lei Hua Chuanfei Li Chunlong Tan Teng Xiong Pingran Guo Hao Yue Weiming Pan Feng Chen Long Zhang Shenghu He Yuan Zhao Hongwei | 2018 | IMP & HIRFL Annual Report2018，，1： | 0 |
| 3 | 洁净间腔串装配与场致发射的关系显示文摘The pilot ADS project hosted by IMP and IHEP,which aims to produce a CW proton beam with beam current 10 mA@25 MeV,has successfully ejected out a pulsed proton beam with beam current 12.6 mA@26.1 MeV.It has four cryomodules,totally 22 superconducting cavities.The first two cryomodules,each consists of six Half Wave Resonators(HWRs)with=0.1,have the same structure.The third cryomodule is made up of five tapered HWRs with=0.15.The first three cryomodules are supplied by IMP and the fourth one by IHEP,which consists of five elliptical cavities with=0.21.This paper will show some interesting results about cavity string assembling in cleanroom and the onset of field emission. | Xiong Pingran Song Yukun Shi Zhixiong Guo Hao You Zhiming Jiang Tiancai Zhang Shengxue Yue Weiming Li Yongming Zhang Shenghu He Yuan | 2017 | IMP & HIRFL Annual Report2017，，1： | 0 |
| 4 | Annual Report of RF Surface Technology Research Group显示文摘RF Surface Technology Research Group was founded in August 2019.It was evolved from the former Supercon-ducting Radio Frequency(SRF)research group of Linac center.The primary research topics will be presented in this report. | Tan Teng Yang Ziqin You Zhiming Chu Qingwei Huang Shichun Xiong Pingran Guo Hao Song Yukun Wu Andong Li Lu Pan Feng Liu Xinmeng Lu Ming | 2019 | IMP & HIRFL Annual Report2019，，1： | 0 |
| 5 | Optimization of the Coating Process for Nbg_(3)Sn Cavity显示文摘After many years of worldwide exploration and improvement of the post treatment process,niobium(Nb)cavities are now approaching their fundamental limits both in terms of maximum acceleration field and in terms of surface resistance at typical operating temperatures. | Yang Ziqin He Yuan You Zhiming Guo Hao Xiong Pingran Song Yukun Zhang Shengxue Lu Ming Lin Zeqiang Huang Shichun Wu Andong Chu Qingwei Tan Teng Pan Feng Zhang Shenghu | 2019 | IMP & HIRFL Annual Report2019，，1： | 0 |
| 6 | Improvement of the Assembly between Cavity Flanges and the BCP Facility at IMP显示文摘The Buffered Chemical Polishing(BCP),consisting of one volume of 40%HF,one volume of 65%HNO_(3) and two volumes of 85%H_(3)PO_(4),has been considered as a popular method for etching the inner surfaces of niobium cavities after its fabrication,especially for lowβ(β<0.3)cavities. | Guo Hao Xiong Pingran Song Yukun You Zhiming Tan Teng | 2019 | IMP & HIRFL Annual Report2019，，1： | 0 |
| 7 | 6-5 Operation of HWRs for C-ADS Injector显示文摘There are two types of HWR cavities have been developed in IMP for C-ADS Injector.HWR010s have been used to accelerate proton from 2.1 MeV to 10 MeV.There are 12 HWR010s assembled in two CMs.The taper type HWR015s have been used to accelerate proton from 10MeV to 18.5 MeV.There are 5 HWRs assembled in the third CM.Proton beam has been accelerated to 26 MeV by HWR010,HWR015 and Spoke021 in June 2017.The beam has been accelerated to 18.5 MeV by HWR010 and HWR015.The CMs in the tunnel are shown in Fig.1. | Yue Weiming Zhang Shenghu Li Yongming Chang Wei Jiang Tiancai Zhang Shengxue Gao Zheng Wang Ruoxue Huang Shichun Pan Feng Chen Long Li Chunlong Song Yukun Guo Hao Xiong Pingran Cong Zhang Tan Teng Wan Yuqin Niu Xiaofei Bai Feng Hu Chuanfei Zhang Peng Liu Lubei Huang Yulu Zhao Yugang Guo Xiaohong You Zhiming Zhang Junhui Huang Guirong He Yuan | 2016 | IMP & HIRFL Annual Report2016，，1： | 0 |
| 8 | 6-8 Electropolishing of Niobium from Choline Chloride Based Ionic Liquid显示文摘The BCP solutions use mixed acids based on HF acid,which carry significant potential safety hazard during operation.Developing a safe and green polishing solution without HF is an important research subject for cavity’s surface treatment[1].We adopt green ionic liquids for polishing solution of electropolish niobium samples.In the experiment,niobium samples were electropolished from a 1:2:1 Choline chloride–urea-ammonium fluoride ionic liquid under different conditions(Fig.1).The surface of Nb sample without any treatment is dark and uneven(1#of Fig.1).After electropolished at 50℃,the surface of Nb sample become smooth,but the glossiness is not good(2#of Fig.1).Improving the electropolishing temperature to 80℃,the glossiness of Nb becomes good and the surface becomes even(3#of Fig.1).In order to compare the electropolishing effect intuitively,put a ruler before the treated samples. | Chu Qingwei He Yuan Zhang Shenghu You Zhiming Guo Hao Xiong Pingran | 2016 | IMP & HIRFL Annual Report2016，，1： | 0 |
| 9 | 6-9 Status of the Electropolishing System at IMPCAS显示文摘IMP(Institution of Modern Physics)has designed,fabricated and installed the first SRF cavity electropolishing system of China.It’s sized for 1.3 GHz SRF cavities,and can work for multiple cell cavities with further upgrade of structure as well.Producing high field and Q-values in superconducting RF cavities of niobium has required the removal of a substantial layer of the inner cavity surface,typically of the order of 100 microns in depth.Two methods have commonly been used:EP(electropolishing)or BCP(buffered chemical polish).EP of niobium cavities is proving to yield consistently better performance than BCP.To take advantage of high performance levels obtainable with EP technique,a completed EP system was installed and operated at IMP. | Li Lu He Yuan You Zhiming Guo Hao Xiong Pingran Zhu Xinlong Li Yongming Zhang Shenghu Zhang Bin | 2016 | IMP & HIRFL Annual Report2016，，1： | 0 |
| 10 | 6-11 SRF Power Input Coupler for HWR010 at IMP显示文摘The high power superconducting radiofrequency(SRF)input coupler is the connecting part between the SRF cavity and the RF transmission line.With the RF power transferred through the coupler,the SRF cavity can built up the electromagnetic field and then accelerate the beams.In addition to this RF transmission function,it also has to serve as a vacuum barrier for the SRF cavity vacuum.The HWR010 coupler which designed by IHEP is a single ceramic window coupler. | Li Yongming Jiang Tiancai Wang Ruoxu Zhang Shenghu Yue Weiming Xiong Pingran Li Chunlong Liu Lubei Zhang Shengxue Song Yukun He Yuan | 2016 | IMP & HIRFL Annual Report2016，，1： | 0 |
| 11 | 6-12 Design of a Double Spoke Cavity for CADS显示文摘Spoke cavities have been developed and have apparent advantages for high current proton accelerator based on Fig.1(color online)The electromagnetic field distribution.superconductivity at low and medium energy region.As the research and the technical reserve,Institute of Modern Physics(IMP)has started the R&D program of a double spoke cavity(operating frequency 325 MHz, 0=0.52),within the framework of China Accelerator Driven System(C-ADS)project.The RF design and mechanical structure design have been finished,and two prototype cavities were manufactured in Harbin. | Jiang Tiancai Zhang Shenghu Li Yongming Yue Weiming Xiong Pingran Li Chunlong Liu Lubei Zhang Shengxue Wang Ruoxu Song Yukun Guo Hao Huang Yulu You Zhiming He Yuan | 2016 | IMP & HIRFL Annual Report2016，，1： | 0 |
| 12 | 6-15 Plasma Discharge for In-situ Cleaning of SRF Cavities显示文摘Field emission occurred in superconducting radio-frequency(SRF)cavities is the major obstacle of the accelerators operating at high gradient,which partly caused by the inner surface contamination,such as the hydrocarbons and the absorbed residual gas.The plasma processing can be an effective method to solve the field emission issues.The properties of low temperature glow discharge,which was argon plasma with the chemically reactive oxygen,were investigated for the SRF cavities used for CADS project. | Wu Andong Yang Lei Li Yongming Yue Weiming Li Chunlong Xiong Pingran Guo Hao Song Yukun Chu Qingwei Jiang Tiancai Zhang Shengxue You Zhiming Zhang Shenghu He Yuan Zhao Hongwei | 2016 | IMP & HIRFL Annual Report2016，，1： | 0 |
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