TY - CONF AU - Chen, Y.K. AU - Jing, H.T. AU - Meng, C. AU - Song, Y.P. AU - Tang, J.Y. AU - Zhao, G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Proton Beam Steering for the Experimental Muon Source at CSNS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Experimental Muon Source (EMuS) is a muon source to be built at China Spallation Neutron Source (CSNS). The EMuS baseline design adopts a stand-alone target sitting in capture superconducting solenoids, and the muon beam is extracted in the forward direction. In the same time the spent protons are also extracted from the target station and guided to an external. Because there is an angle of 15 degrees between the axis of solenoids and the proton direction, the protons will be deviated by the solenoid field. A pair of correction magnets in front of the solenoids is used to align the incoming proton beam to the target and also guide the spent protons to the beam dump. As the target station is design to work at different field level, this increases the complexity of the proton beam transport. PB - JACoW Publishing CP - Geneva, Switzerland SP - 193 EP - 195 KW - proton KW - solenoid KW - target KW - extraction KW - neutron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPGW046 UR - http://jacow.org/ipac2019/papers/mopgw046.pdf ER - TY - CONF AU - Li, M.T. AU - An, Y.W. AU - Li, F. AU - Xu, S.Y. AU - Xu, T.G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Application of WCM in Beam Commissioning of RCS in CSNS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Wall Current Monitor (WCM) is the only beam instru-ment in RCS of CSNS. It is utilized to derive many kinds of physics parameters during beam commissioning. The longitudinal phase distribution of the bunch over the boosting time is deduced for our future analyzation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 636 EP - 638 KW - proton KW - neutron KW - bunching KW - MMI KW - target DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB028 UR - http://jacow.org/ipac2019/papers/moprb028.pdf ER - TY - CONF AU - Li, M.T. AU - An, Y.W. AU - Xu, S.Y. AU - Xu, T.G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Longitudinal Tomography for Analysing the Longitudinal Phase Space Distribution in RCS of CSNS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - It is proved that in the beam commissioning of the RCS of CSNS, the longitudinal optimization is vital for the promotion of the beam power. The WCM is the only beam instrument for the measurement of the longitudinal parameters. It is important for us to deduce the longitudi-nal phase space distribution, using the WCM data. The longitudinal tomography is applied, and some satisfying results have been obtained. PB - JACoW Publishing CP - Geneva, Switzerland SP - 639 EP - 642 KW - MMI KW - neutron KW - synchrotron KW - FEL KW - proton DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB029 UR - http://jacow.org/ipac2019/papers/moprb029.pdf ER - TY - CONF AU - Wang, Y. AU - Dai, J.P. AU - Fan, M.X. AU - Li, A.H. AU - Li, B. AU - Liu, H.C. AU - Qu, P.H. AU - Sha, P. AU - Wu, X.L. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Optimization of SC Cavity Type for CSNS Linac Upgrade J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In order to increase CSNS beam power from 100kW to 500kW, the Linac injection energy need to be increased from 80MeV to 300MeV. The combined layout of superconducting spoke cavities and elliptical cavities will be adopted to accelerate H⁻ beam to 300MeV. Two operation frequency of spoke cavities were compared with single and double spoke structure, a compact 648MHz βg=0.4 single spoke cavity was proposed, and the RF performance was presented, as well as the MP behavior. PB - JACoW Publishing CP - Geneva, Switzerland SP - 987 EP - 989 KW - cavity KW - linac KW - operation KW - neutron KW - acceleration DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPTS056 UR - http://jacow.org/ipac2019/papers/mopts056.pdf ER - TY - CONF AU - An, Y.W. AU - Cao, X. AU - Chen, W. AU - Huang, T. AU - Li, H. AU - Liu, S. AU - Lv, Y.J. AU - Ouyang, H.F. AU - Xiao, Y.C. AU - Xue, K. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - The Operation Status of CSNS Front End J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - China spallation neutron source (CSNS), as the China’s first 100kW beam power pulsed neutron source, its operation target beam power is now larger than 50kW. During the beam power upgrading process of CSNS to 50kW from 2018 to 2019, many improvements have been made for the front end of CSNS. In this paper, the commissioning and improvement of front end as well as the laboratory construction are introduced. The improvements mainly focus on solving the stability of ion source and the spark of Radio Frequncy quadrupole (RFQ) caused by the pre-chopped beam into RFQ. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2024 EP - 2026 KW - rfq KW - ion-source KW - emittance KW - LEBT KW - operation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS038 UR - http://jacow.org/ipac2019/papers/tupts038.pdf ER - TY - CONF AU - Wang, L. AU - Chu, C.P. AU - Guo, F.Q. AU - He, Y.C. AU - Jin, D.P. AU - Kang, M.T. AU - Wu, X. AU - Zhang, Y.L. AU - Zhu, P. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Quality Assurance for CSNS Operation J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Because CSNS (China Spallation Neutron Source) is now in early operation, the focus has been shifted from beam commissioning to reliable operation, therefore, a suite of QA tools are under development. These tools include Elog system and operation issue tracking system which can record events and track issue status in the process of operation. This paper will describe the application of QA tools in CSNS and the development progress of them. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2575 EP - 2577 KW - operation KW - database KW - interface KW - MMI KW - controls DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW043 UR - http://jacow.org/ipac2019/papers/wepgw043.pdf ER - TY - CONF AU - Kang, L. AU - Chen, J.X. AU - He, H.Y. AU - Liu, L. AU - Liu, R.H. AU - Nie, X.J. AU - Ning, C.J. AU - Wang, A.X. AU - Wang, G.Y. AU - Yu, J.B. AU - Yu, Y.J. AU - Zhang, J.S. AU - Zhu, D.H. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Key Technologies for Remote Detection of CSNS Radiation Environment J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - China Spallation Neutron Source (CSNS) has been continuously operating in September 2018. As the operating time increases the radiation dose will also increase, some equipment maintenance and testing must take special tools and equipment. This article mainly introduced the studies on radiation environment of several detection technologies, such as: remote vacuum leak detection methods and equipment, strong magnetic field environment vibration measuring technology, using Qr code tracing machine walking vehicle inspection system and remote image vision measurement technology, etc., these advanced technology also has a guiding significance to other related fields. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2584 EP - 2586 KW - vacuum KW - controls KW - radiation KW - operation KW - target DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW046 UR - http://jacow.org/ipac2019/papers/wepgw046.pdf ER - TY - CONF AU - Sun, J.L. AU - Qiu, R.Y. AU - Tian, J.M. AU - Xu, T.G. AU - Xu, Zh.H. AU - Yang, T. AU - Zeng, L. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Study with Wire Scanner and Beam Loss Monitor at CSNS-LINAC J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - China Spallation Neutron Source (CSNS) consists of 80 MeV H⁻ LINAC, 1.6 GeV RCS, RTBT line and one target. Many wire scanners and beam loss monitors (BLM) distributed along the LINAC and the RTBT for the profile and beam loss measurement. For the wire scanner, signal on the wire induced by the secondary electron is used for the profile measurement. Signal lost may happen when the wire or the signal chain shorted, thus a backup readout chain is required for the accident condition. As for the BLM, it is difficult to do the online calibration to see how sensitive the monitor is. Based on the two requests above, a crosscheck study was carried out recently, one wire scanner and the BLM next to it were chose at LINAC and RTBT. Both wire signal and BLM signal were recorded while the wire scanner crossing the beam. We found these two type of signals have the same accuracy for the profile measurement, and ~ 1 μA beam loss induced by the wire disturbance can be detected. Also thermal electron emission suspected happening during the measurement. More detailed experiment will be carried out in December. Secondary electron emission efficiency of the tungsten wire and thermal electron emission rate will be verified then. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2598 EP - 2601 KW - MEBT KW - electron KW - experiment KW - linac KW - neutron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW053 UR - http://jacow.org/ipac2019/papers/wepgw053.pdf ER - TY - CONF AU - Fan, M.X. AU - Chen, Q. AU - Fu, S. AU - Li, A.H. AU - Li, B. AU - Liu, H.C. AU - Peng, J. AU - Qu, P.H. AU - Wang, A.X. AU - Wang, Y. AU - Wu, X.L. AU - Xiaolei, X.L. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Multipacting Studies of the Coaxial Coupler for BNCT DTL J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Multipacting is a phenomenon in which electrons grow sharply under certain conditions in a RF structure. It may lead to the breakdown or even damage to the equipment. Therefore, it is very important to calculate the Multipact-ing range in the RF equipment design. Since the phe-nomenon is too complicated to use the formula to fully predict it, numerical simulation is employed. There are many computer codes (such as Track3P, MultiPac, CST PS, etc.) used to simulate the phenomenon, but most of them are not commercial. In this paper, theories used in coaxial line for predicting multipacting are introduced; the CST PS is chosen to simulate the multipacting of coaxial coupler for BNCT DTL; finally, methods of sup-pressing multipacting are discussed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2921 EP - 2924 KW - multipactoring KW - simulation KW - DTL KW - impedance KW - neutron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB050 UR - http://jacow.org/ipac2019/papers/weprb050.pdf ER - TY - CONF AU - Wu, B. AU - Li, X. AU - Sun, H. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - MA RF Cavity Design and Simulation for CSNS/RCS Upgrade Project J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The dual harmonic RF system will be adapted for Chi-na Spallation Neutron Source (CSNS) upgrade project. Limited locations in CSNS/RCS are reserved to install additional three 2nd harmonic cavities. The cavity loaded by magnetic alloy (MA) material would be used. Because of the low Q factor of the MA core, the cavity cooling be-comes a very important issue in cavity design. Air-forced, indirect and direct cooling scheme were studied. The fluid thermodynamic of different cooling structure were simu-lated by ANSYS CFX which considered the anisotropy of thermal conductivity of MA core. The limitation of these cooling schemes were discussed in detail based on the simulation results. Indirect cooling experiment was done to assess the cooling efficiency and verify the simulation result. A high power test cavity cooled by water has been designed to estimate the property of the MA core and cooling effectiveness for CSNS/RCS. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2925 EP - 2927 KW - cavity KW - simulation KW - experiment KW - synchrotron KW - detector DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB051 UR - http://jacow.org/ipac2019/papers/weprb051.pdf ER - TY - CONF AU - Li, M.T. AU - An, Y.W. AU - Wang, S. AU - Xu, S.Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - The Synchronization between BPMs and Corrector Power Supplies in AC Mode of RCS of CSNS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - This paper introduces our effort for synchronizing BPMs and Corrector Power Supplies in AC mode of RCS of CSNS. This work helps to increase the accuracy of the response matrix measurement, the obit correction, and other commissioning task. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3164 EP - 3166 KW - power-supply KW - timing KW - MMI KW - pick-up KW - neutron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS029 UR - http://jacow.org/ipac2019/papers/wepts029.pdf ER - TY - CONF AU - Zhukov, A.P. AU - Allen, C.K. AU - Bolling, B.E. AU - Chu, C.P. AU - Dodson, T. AU - Esteban Müller, J.F. AU - Gillette, P. AU - Laface, E. AU - Laurent, P. AU - Levinsen, Y. AU - Li, M.T. AU - Li, Y. AU - Lu, X.H. AU - Milas, N. AU - Normand, G. AU - Peng, J. AU - Rosati, C. AU - Savalle, A. AU - Shishlo, A.P. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Open XAL Status Report 2019 J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Open XAL accelerator physics software platform is being developed through an international collaboration among several facilities since 2010. This paper discusses progress in beam dynamics simulation, new RF models, and updated application framework along with new generic accelerator physics applications. We present the current status of the project, a roadmap for continued development and an overview of the project status at each participating facility. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3341 EP - 3344 KW - cavity KW - LEBT KW - linac KW - framework KW - status DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS096 UR - http://jacow.org/ipac2019/papers/wepts096.pdf ER - TY - CONF AU - Li, Y. AU - Bao, Y. AU - Fan, R. AU - Li, X. AU - Ning, C.J. AU - Tong, X. AU - Wang, P.C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Moderation of Positive Muons by Helium Gas J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Efficiently creating beams of spin-polarized positive muons with energies between eV and keV (so-called slow muon beams) is important for further development and application of muon spin rotation, relaxation, and resonance techniques. One existing moderation method involves the use of wide-band-gap materials as moderators such as rare gas solids and solid nitrogen thin films (band-gap energy between 11 eV and 22 eV). Based on this moderation method, we have studied the use of helium gas as a moderator, with the goal of producing the slow muon beam more efficiently. Because of helium’s high (24.6 eV) ionization energy and because the cross section for muonium formation is suppressed in helium gas, we expect the production of slow muons using helium gas to be highly efficient. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3667 EP - 3669 KW - proton KW - experiment KW - simulation KW - scattering KW - vacuum DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPGW039 UR - http://jacow.org/ipac2019/papers/thpgw039.pdf ER - TY - CONF AU - Song, Y.P. AU - Bao, Y. AU - Chen, Y.K. AU - Jing, H.T. AU - Meng, C. AU - Tang, J.Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Decay Muon Beamline Design for EMuS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The beamline design philosophies and simulation re-sults of the decay muon on Experimental Muon Source (EMuS) are reported in this paper. The beamline is com-posed of solenoids to keep large acceptance, and has been optimized for 45, 150 and 450 MeV/c decay muon re-spectively according to the π spectra optimization results from target station. Decay muons from 45 to 150 MeV/c are designed for μSR applications, and 150 to 450 MeV/c are designed for muon imaging, which is unique on the high momentum perspective. Negative muons from 45 to 150 MeV/c are designed for muonic applications. The momentum range of decay muon is tuneable between 45 and 450 MeV/c. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3670 EP - 3672 KW - target KW - proton KW - solenoid KW - simulation KW - dipole DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPGW040 UR - http://jacow.org/ipac2019/papers/thpgw040.pdf ER - TY - CONF AU - Wang, A.X. AU - Chen, J.X. AU - He, H.Y. AU - Kang, L. AU - Liu, L. AU - Nie, X.J. AU - Ning, C.J. AU - Sun, J.L. AU - Wang, G.Y. AU - Yu, J.B. AU - Yu, Y.J. AU - Zhang, J.S. AU - Zhu, D.H. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - The Deformation-Stress Simulation and Measurement of Titanium Foil Strip for Hadron Monitor J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The measurement of beam profile by hadron monitor is in fact the measurement of the positive current after the secondary electrons escaped. According to the situation that the number of beam particles is small and the current signal is weak, the material titanium with high secondary electron generation rate is select by material comparison, and the foil strip type is used to increase the cross section area to obtain lager current level. On account of dead weight itself, as well as thermal expansion and contraction, the foil strip shall be loose. The loosen strip will deviate from its theoretical position, and cause the measuring error. Therefore, the deformation-stress of Ti foil strip (1000*50*0.1) was simulated under the pretension (10~90N) with the finite element software ANSYS. A set of experiment device with pretension adjustment and heating for the foil strip was designed, and then the deformation-stress was tested by a high precision 3-D imaging measurement system. Compared with the simulation results, the pretension would better set at about 50N. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4187 EP - 4189 KW - electron KW - simulation KW - experiment KW - hadron KW - ECR DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS037 UR - http://jacow.org/ipac2019/papers/thpts037.pdf ER - TY - CONF AU - Chen, J.X. AU - He, X.Y. AU - Wang, W. AU - Zhang, H.T. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Design of a CCD-based Laser Alignment Detection System J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Accelerator online alignment technology is an important means for accelerator stability detecting. A CCD-based laser alignment detection system is designed for the linear accelerator, and the detection distance of the system could reach 100m. The reference comparison method is used to detect the laser imaging position acquired by the reference detector at different times, and to obtain the relative positional deviation of the measurement reference or the tested objects. Through the measurement error analysis, the precision of the system is expected to reach ±10μm. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4311 EP - 4313 KW - laser KW - alignment KW - detector KW - controls KW - vacuum DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS086 UR - http://jacow.org/ipac2019/papers/thpts086.pdf ER -