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TY - UNPB AU - Dou, W.P. AU - He, Y. AU - Jia, H. AU - Liu, S.H. AU - Wang, C. AU - Wang, Z.J. ED - Schaa, Volker RW TI - The Beam Dynamics Design of CW RFQ for Chinese ADS J2 - Proc. of HB2018, Daejeon, Korea, 17-22 June 2018 C1 - Daejeon, Korea T2 - ICFA Advanced Beam Dynamics Workshop T3 - 61 LA - english AB - A superconducting proton linear accelerator for Chinese ADS have been proposed by IMP CAS. The preliminary beam dynamics design is finished. The RFQ is designed to be operated at CW mode will accelerate 10 mA proton from 35 keV to 2.1 MeV. The acceleration rate of RFQ is 95.2% with the length of 4.5 meters. The 99.9 % longitudinal emittance at the RFQ exit is optimized to 4.98 pi.mm.mrad and 0.18 times of the longitudinal acceptance of downstream superconducting accelerator. These goals of RFQ beam dynamic studies usually are minimize the vane length, beam loss and emittance growth. But the 99.9 % longitudinal emittance of RFQ is proposed as the new and key optimization goal to reduce the possibility of downstream beam loss for the RFQ which is in the front of superconducting linear accelerator. The 99.9 % longitudinal emittance is optimised at the cost of RFQ transmission rate though three steps. First, the optimised longitudinal phase space is got by the long and stable shaper section. Second, Smaller longitudinal acceptance is adopted to make particle loss in low energy section. third, the shrink of longitudinal acceptance is optimised to get lower 99.9% longitudinal emittance. PB - JACoW Publishing CP - Geneva, Switzerland ER -