Y. He
IMP/CAS, Lanzhou, People’s Republic of China
The CW superconducting linac CAFe (China ADS Front-end demo facility) at IMP was designed for 25 MeV protons aiming at the front-end demonstration of China ADS project in 2011 and constructed in 2017. Since then, the major upgradings have been made to accelerate the particles with A/q=2. It consists an RFQ for alphas, three cryomodules with 6 HWRs of beta 0.1 and one cryomudule with 5 taper-type HWRs of beta 0.15. It can accelerate protons to 20 MeV and alphas to 40 MeV. It took more than 3 years to improve the hardware and software to go after a higher beam power and higher availability during operation according to the lessens learned from several commissioning campaigns. At beginning of 2021, it achieved 10 mA and 205 kW continuous wave (CW) proton beam successfully. The beam availability remains 93%~96% during operation test in 12 hours at 174kW/10mA and in 108 hour at 126kW/7.3mA. This talk will report the progress of the CAFe with describing the operation experience and lessons learned including cavities, cryogenics, LLRF. The recent Nb/Cu cavity development at IMP will be also reported as an R&D topic for the future ADS. supported by NSF GRAND 11525523 and 91426303
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CiADS and HIAF Superconducting Cavity Development Status and the Transition to Production Stage
273
M. Xu, H. Guo, Y. He, S.C. Huang, Y.L. Huang, T.C. Jiang, C.L. Li, L.B. Liu, S.H. Liu, T. Liu, S.M. Shanab, T. Tan, Y. Tao, Y.Q. Wan, F.F. Wang, R.X. Wang, Z.J. Wang, P.R. Xiong, J.C. Yang, Z.Q. Yang, S.H. Zhang, S.X. Zhang
IMP/CAS, Lanzhou, People’s Republic of China
E.Z. Zaplatin
FZJ, Jülich, Germany
Funding:Work supported by Large Research Infrastructures "China initiative Accelerator Driven System’(Grant No.2017-000052-75-01-000590 ) Two accelerators facilities, China initiative Accelerator Driven Sub-critical System (CiADS) and High Intensity heavy-ion Accelerator Facility (HIAF), co-funded by the China central and local government, is being designed and constructed at Huizhou city, Guangdong Province. The Institute of Modern Physics(IMP), Chinese Academy of Science is responded for constructing and operating the facility. CiADS’s mission is to demonstrate the principle and technical of employing high power protons to transit fission nuclear plant wastes. HIAF is defined as a nuclear structure research facility. The two linacs contains six types , totally 233 superconducting cavities, will be constructed in recent three years. Stable production rate and reliable surface processing will be the main challenges. This paper reports the cavity design, prototype status and massive production plan and status.
The Development of a Prototype Fundamental Power Coupler for CiADS and HIAF Half Wave Resonators
295
T.C. Jiang, F. Bai, Y. He, Z.Q. Lin, Y.Q. Wan, R.X. Wang, Z.J. Wang, M. Xu, S.H. Zhang
IMP/CAS, Lanzhou, People’s Republic of China
More than 100 Half-wave resonators (HWR) will be adopted for China Initiative Accelerator Driven Sys-tem (CiADS) and High Intensity heavy-ion Accelerator Facility (HIAF) at IMP. Each HWR cavity equips with one variable coupling, dual-warm-ceramic fundamen-tal power coupler (FPC). The FPC should be able to transmit up to 30 kW in CW mode. This paper will give an overview of the RF design of the 162.5 MHz CW power coupler. The coupler employs two warm ceram-ics in a 50 Ω coaxial line to ensure operation relia-bility. The results of thermal and thermomechanical will also be reported. Two prototype couplers have been fabricated and the RF measurements with low RF power were carried out.
Deflecting Cavities for Proton Beam Spreader in CiADS Project
445
Y.L. Huang, Y. He, H. Jia, Y.S. Qin, Z.J. Wang, Z.L. Zhang
IMP/CAS, Lanzhou, People’s Republic of China
Funding:Large Research Infrastructures "China initiative Accelerator Driven System’(Grant No.2017-000052-75-01-000590 ) and National Natural Science Foundation of China (Grant NO. 11805249) Chinese initiative Accelerator Driven Subcritical System (CiADS) is supposed to accelerate continuous 162.5 MHz, 10 mA (or higher) proton beam to 500 MeV (or higher energy) with a superconducting driver linac. More application scenarios based on this high power intensity proton linac are now under considerations. Beam spreader system based on deflecting cavities for multiple users simultaneous operation are discussed in this paper, as well as the RF structure options for the equal eight- and nigh- beam-line split schemes. #huangyulu@impcas.ac.cn
650 MHz Elliptical Cavities in IMP for CiADS Project
594
Y.L. Huang, H. Guo, Y. He, C.L. Li, T. Liu, R.X. Wang, Z.J. Wang, M. Xu, Z.Q. Yang, S.X. Zhang
IMP/CAS, Lanzhou, People’s Republic of China
Funding:Large Research Infrastructures "China initiative Accelerator Driven System"(Grant No.2017-000052-75-01-000590 ) and National Natural Science Foundation of China (Grant NO. 11805249) 650MHz multi-cell superconducting elliptical cavities with optimum beta equal to 0.62 and 0.82 were adopted in the driver linac of Chinese initiative Accelerator Driven Subcritical System (CiADS) to accelerate the 10 mA proton beam from 175 MeV up to 500 MeV, with the possibility to upgrade the energy to 1 GeV and higher. Mechanical design and optimization of the niobium cavity-titanium helium vessel assembly will be summarized in this paper. Vertical test results of three single cell prototype cavities will also be discussed, with comparisons with the simulation values. *Work supported by Large Research Infrastructures "China initiative Accelerator Driven System’(Grant No.2017-000052-75-01-000590 ) and National Natural Science Foundation of China (Grant NO. 11805249)
