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| 1 | 6-4 Development of a Slow Tuner for the 162.5 MHz Superconducting Half-wave Resonator in IMP显示文摘China-ADS project, a continuous wave (CW) proton accelerator and aims to design and build an ADS demonstration facility has been proposed and launched actively in China. HWR ( =0.10) superconducting cavity with frequency of 162.5 MHz is applied to one of the parallel injectors prompted by Institute of Modern Physics (IMP)[1]. | Liu Lubei Zhang Bin He Yuan Zhang Shenghu Wang Ruoxu | 2015 | IMP & HIRFL Annual Report2015，，1： | 0 |
| 2 | 6-7 Dual-windows Coupler R&D in IMP显示文摘IMP hosts the project of high intensity Heavy Ion Accelerator Facility (HIAF). High power input couplers are needed for the SRF cavities. In order to assemble cryo-module easily and run the machine safely, new TTF-III like demountable dual-ceramic coupler is developed. This paper will present some results of the 162.5 MHz coupler for the tapper HWR cavity. | Li Yongming Wang Ruoxu Zhang Shenghu Jiang Tiancai Sun Guozhen Liu Lubei He Yuan Zhao Hongwei | 2015 | IMP & HIRFL Annual Report2015，，1： | 0 |
| 3 | 6-8 Volume Production of HWR010 Cavities in IMP显示文摘The development of the Half Wave Resonator (HWR010) is based on the China ADS project. The HWR010 operates at 162.5 MHz and can provide more than 0.78 MV of accelerating voltage per cavity for proton with opt=0.10. The goal of the RF properties is to get a lower heat load and a higher accelerating gradient, which are determined by a higher R/Q0 and lower peak surface fields (Bpk/Eacc and Epk/Eacc). In order to optimize the HWR geometry parameters, CST-MWS is used to conduct the RF simulation. The optimized RF parameters are show in Table 1. | Yue Weiming Zhang Shenghu He Yuan Linac Group | 2015 | IMP & HIRFL Annual Report2015，，1： | 0 |
| 4 | 6-10 Beam Commissioning Activities of CADS Superconducting Demo Facility显示文摘The demo facility of china ADS injector II was installed in the tunnel in 2014. The on-site layout of demo facility is shown in the Fig. 1. The demo faclity mainly includes ECRIS, LEBT, RFQ acclerator, MEBT and TCM6. The TCM6 is composed by six SC HWR cavity,six SC soleniods and five BPMs. The TCM6 will be the prototype for the future 2025 MeV CADS superconducting linac. The beam commissioning of CADS Injector II started in June 2015. It mainly consists of three steps. | Wang Zhijun He Yuan Jia Huan Dou Weiping Liu Shuhui Chen Weilong Tao Yue Wu Jianqiang Zhang Shenghu Zhao Hongwei | 2015 | IMP & HIRFL Annual Report2015，，1： | 0 |
| 5 | 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 |
| 6 | A self-assembled(H_2O)_(20)(CH_3OH)_4 binary cluster containing a grail-shaped hexadecameric water cluster trapped in the cavity of a metal-ligand hybrid显示文摘A discrete centrosymmetric(H2O)20(CH3OH)4 binary cluster was confined in the cavity of a metal-ligand hybrid [Ag4(bpda)2(bpp)4·14H2O·2CH3OH] n(1)(where bpp = 1,3-bis(4-pyridyl)propane and H 2 bpda = 2,2'-biphenyldicarboxylic acid).The novel mixed water-methanol cluster consists of one grail-shaped hexadecameric cluster,four dangling water and four hanging methanol molecules.The(H 2 O) 16 cluster is composed of two pairs of edge-sharing(H2O) 5 rings attached to one(H2O) 4 core with twenty hydrogen bonds.Alternatively,the(H2O) 16 cluster is structurally similar to a complicated hydrocarbon generated by undergoing [2+2] cycloaddition of 1,2,3,4,5,6-hexahydropentalene,which reveals the resemblance between water clusters and organic compounds. | LUO GengGeng HE WeiJun LIU Li WU ShengHu LI DongXu XIAO ZiJing DAI JingCao | 2012 | Science China Chemistry2012，55，12： | 0 |
| 7 | 6-11 Mechanical Design of the Bead-Pull and Tuning Test Device for the CH Cavity at IMP显示文摘The copper model CH cavity was designed and fabricated at IMP for Injector II of CIADS project operating atfrequency 162.5 MHz, =0.065[1]. To research the electromagnetic mode evaluated by the electric field distributionand the tuning properties of the CH cavity the bead-pull and tuning test device was set up. It included two parts,the beadpull mode and the tuning test mode. A brief description of the equipment design is shown in Fig. | Wang Fengfeng Zhang Bin Xu Mengxin He Yuan Zhang Shenghu | 2014 | IMP & HIRFL Annual Report2014，，1： | 0 |
| 8 | 6-12 Study of IMP Superconducting CH Cavity显示文摘The cross bar H mode (CH) cavity is suitable to accelerate the low energy and medium energy proton. Theoperating mode in the CH cavity is H210. Compared with other low-beta superconducting cavities, the CH cavitywith multi-cell structure has high real acceleration gradient. In superconducting CH cavity, the cross bar is helpfulto rigidize the cavity mechanically. Since the year of 2011, IMP have involved into the research of superconductingCH cavity for the ADS project[1]. There are three CH cavity have been fabricated, one copper model CH cavityand two niobium superconducting CH cavity[2]. | Xu Mengxin He Yuan Zhang Shenghu | 2014 | IMP & HIRFL Annual Report2014，，1： | 0 |
| 9 | 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 |
| 10 | 近物所半波长010超导腔机械设计优化显示文摘SRF cavities are the common accelerating structures for many accelerators nowadays.Since a series of external loads on the resonator walls predetermine the main working conditions of the SC cavities,the detailed investigation of their mechanical properties should be conducted in parallel with the main RF design.The effects of very high electromagnetic fields that result in strong Lorentz forces and the pressure on cavity walls from the helium tank that also deforms the cavity shape,the tuning scheme resulting in the change of accelerating field profile and mechanical eigen resonance of cavities which are the main source of the microphonics must be taken into account during integrated design of the resonator and its liquid helium vessel. | Yue Weiming Zhang Shengxue Huang Lvlu Zhang Cong Evgeny Zaplatin Tan Teng Zhang Shenghu He Yuan | 2017 | IMP & HIRFL Annual Report2017，，1： | 0 |
| 11 | 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 |
| 12 | Development of RF Cavities at the Department of RF Cavity in 2019显示文摘The cavity design including RF design and multi-physics analysis of the RFQ for the CAFe(Chinese Accelerator Facility for super-heavy Elements)project have been completed by the end of 2019. | Zhang Zhouli Yue Weiming Li Chenxing Li Chunlong Huang Yulu Wang Ruoxu Xu Xianbo Zhang Shengxue Zhang Shenghu He Tao Yang Lei Xing Chaochao Lin Zeqiang | 2019 | IMP & HIRFL Annual Report2019，，1： | 0 |
| 13 | 650 MHz Elliptical Cavities Development in IMP for CiADS显示文摘Multicell superconducting radio frequency(SRF)elliptical cavities are proposed for efficient acceleration of proton beam in the Chinese initiative Accelerator Driven Subcritical System(CiADS). | Huang Yulu Wang Ruoxu Liu Lubei Jiang Tiancai Zhang Shengxue Liu Shuhui Tan Teng Guo Hao Li Chunlong Yue Weiming Zhang Zhouli Wang Zhijun Zhang Shenghu He Yuan | 2019 | IMP & HIRFL Annual Report2019，，1： | 0 |
| 14 | 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 |
| 15 | CASCIRE surveillance network and work on avian influenza viruses显示文摘Studies on influenza virus by Chinese Academy of Sciences(CAS)could be traced back as early as 2005 by the CAS Key Laboratory of Pathogenic Microbiology and Immunology(CASPMI),who discovered that Qinghai-like Clade 2.2H5N1 subtype highly pathogenic avian influenza virus(HPAIV)first caused severe outbreak in wild birds in Qinghai Lake(Liu et al.,2005). | Yuhai Bi Weifeng Shi Jianjun Chen Quanjiao Chen Zhenghai Ma Gary Wong Wenxia Tian Renfu Yin Guanghua Fu Yongchun Yang William J.Liu Chuansong Quan Qianli Wang Shenghu He Xiangdong Li Qianfeng Xia Lixin Wang Zhaohui Pan Laixing Li Hong Li Wen Xu Ying Luo Hui Zeng Lianpan Dai Haixia Xiao Kirill Sharshov Alexander Shestopalov Yi Shi Jinghua Yan Xuebing Li Yingxia Liu Fumin Lei Wenjun Liu George F.Gao | 2017 | Science China(Life Sciences)2017，60，12： | 0 |
| 16 | 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 |
| 17 | 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 |
| 18 | 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 |
| 19 | 6-10 Evaluation of Power Loss on the NC QWR Cavity of a New Room-temperature Test Stand for Couplers显示文摘Room-temperature test with high power is an essential step before couplers are installed on superconducting cavities.A new room-temperature test stand is being designed at IMP.The new stand will be assembled with a NC(normal-conducting)QWR cavity.The power loss on the cavity when couplers are conditioned in traveling-wave mode has to be thoroughly evaluated.Fig.1 demonstrates the power flow in traveling-wave conditioning mode.Pe1 and Pe2 represent the power that is extracted by couplers.Pf and Pre denote the forward power and reflected power,respectively. | Chen Long Li Yongming Zhang Shenghu Jiang Tiancai Li Chunlong Wang Ruoxu He Yuan | 2016 | IMP & HIRFL Annual Report2016，，1： | 0 |
| 20 | 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 |
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