[1] [1] B. Badger, I. Hofmann, K. O'Brien, F. Arendt, HIBALL e a conceptual heavy-ion Beam Driven Fusion Reactor Study Volume 1, Institut fu¨ r Neutronenphysik Reaktortechnik, Kernforschungszentrum Karlsruhe, Rep. KfK 3202 (1981).

[2] [2] I. Hofmann, HIDIF-an approach to high repetition rate inertial fusion with heavy-ions, Nucl. Instr. and Meth in Phys. Res. A 415 (1998) 11.

[3] [3] A. Schempp, The injector for the HIDIF driver linac, Nucl. Instr. and Meth. in Phys. Res. A 415 (1998) 209.

[4] [4] Y. Fujiie, S. Hayakawa, T. Hattori, Y. Hirao, T. Katayama, et al., Research Report of Institute of Plasma Physics, Nagoya University, 1984. HIBLIC-heavy-ion fusion reactor, Rep. IPPJ-663.

[5] [5] https://www.llnl.gov/.

[6] [6] Liang Lu, Toshiyuki Hattori, Noriyosu Hayashizaki, Takuya Ishibashi, Masahiro Okamura, et al., Development of high intensity linear accelerator for heavy-ion inertial fusion driver, Nucl. Instr. Meth Phys. Res. A 729 (2013) 133-137.

[7] [7] L.M. Young, Operations of the LEDA resonantly coupled RFQ, in: Proceedings of the 2001 Particle Accelerator Conference, Chicago, USA (April 1980), 2001, pp. 309-313.

[8] [8] Wei Ma, Liang Lu, Xianbo Xu, Liepeng Sun, Zhouli Zhang, et al., Design of an 81.25 MHz continuous-wave radio-frequency quadrupole accelerator for low energy accelerator facility, Nucl. Instr. Meth Phys. Res. A 847 (2017) 130-135.

[9] [9] M. Okamura, T. Takeuchi, T. Katayama, R.A. Jameson, Direct injection scheme for RFQ linac, in: Proceedings of LINAC 2002, Gyeongju, Korea, 2002, pp. 91-93.

[10] [10] M. Okamura, R.A. Jameson, J. Takano, K. Yamamoto, H. Kashiwagi, et al., High current RFQ using laser ion source, in: Proceedings of LINAC 2004, Lu¨beck, Germany, 2004, pp. 315-317.

[11] [11] H. Kashiwagi, T. Hattori, N. Hayashizaki, K. Yamamato, Y. Takahashi, et al., Nd-YAG laser ion source for direct injection scheme, Rev. Sci. Instrum. 75 (1569) (2004) 1569-1571.

[12] [12] T. Ishibashi, N. Hayashizaki, T. Hattori, Two-beam interdigital-H-type radio frequency quadrupole linac with direct plasma injection for high intensity heavy-ion acceleration, Phys. Rev. St. Accel. Beams 14 (2011), 060101-1; 060101e060125.

[13] [13] Liang Lu, Toshiyuki Hattori, Noriyosu Hayashizaki, CW Operation on APF-IH linac as a heavy-ion implanter, Nucl. Instr. Meth Phys. Res. A 622 (2010) 485-491.

[14] [14] T. Hattori, K. Sasa, M. Okamura, T. Ito, H. Tomizawa, et al., Conceptual design of compact heavy-ion inertial fusion driver with an r.f. LINAC with high acceleration rate, Fusion Eng. Des. 32e33 (1996) 359-363.

[15] [15] X. Yin, J. Peng, K. Gong, H. Liu, Y. Xiao, et al., Design of the CSNS DTL, in: Proceedings of the Linear Accelerator Conference LINAC2010, Tsukuba, Michigan, Japan, 2010, pp. 554-556.

[16] [16] Liang Lu, T. He, L. Yang, W. Ma, L.P. Sun, et al., Research on a twobeam type drift tube linac, in: Proceedings of the 28th Linear Accelerator Conference, Michigan State University, Michigan, USA, 2016, pp. 989-991.

[17] [17] B. Yu, S. Sharkov, A. kondrashev, Matching of the Intensive Laser Ion Source to the RFQ Accelerators, in: Proceedings of EPAC96, 1996, pp. 1550-1552.

[18] [18] T. Kanesue, M. Okamura, K. Kondo, J. Tamura, H. Kashiwagi, et al., Drift distance survey in direct plasma injection scheme for high current beam production, Rev. Sci. Instrum. 81 (2010) 02B723.

[19] [19] G. Devanz, N. Bazin, G. Disset, H. Dzitko, P. Hardy, et al., Progress in IFMIF half wave resonators manufacturing and test preparation, in: Proceedings of the SRF2015, Whistler, BC, Canada, 2015, pp. 1191-1195.

[20] [20] P. Berrutti, T. Khabiboulline, L. Ristori, N. Solyak, V. Yakovlev, Single spoke resonator inner electrode optimization driven by reduction of multipoles, in: Proceedings of the PAC2013, Pasadena, CA, USA, 2013, pp. 835-837.

[21] [21] https://www.cst.com/products/cstmws.

[22] [22] K. Yamamoto, H. Tanaka, H. Harada, K. Sugahara, H. Inoue, et al., Experimental verification of an APF linac for a proton therapy facility, Nucl. Instrum. Methods Phys. Res. B 269 (2011) 2875-2878.

[23] [23] L. Lu, T. Hattori, N. Hayashizaki, Design and simulation of C6t hybrid single cavity for cancer therapy with direct plasma injection scheme, Nucl. Instrum. Methods Phys. Res. A 688 (2012) 11-21.

[24] [24] K. Saito, N. Bultman, F. Casagrande, S. Chandrasekaran, S. Chouhan, et al., SRF developments at MSU for FRIB, in: Proceedings of the 16th International Conference on RF Superconductivity, September 23-37, 2013, Paris, France, 2013, pp. 106-111.

[25] [25] F.S. He, J.P. Dai, J. Dai, X. Huang, L.H. Li, et al., Status of the superconducting cavity development at IHEP for the CADS linac, in: Proceedings of the 6th International Particle Accelerator Conference, May 3-8, 2015, Richmond, VA, USA, 2015, pp. 3824-3826.

[26] [26] L. Lu, T. Hattori, H.Y. Zhao, K. Kawasaki, L.T. Sun, et al., High power test of an injector linac for heavy-ion cancer therapy facilities, Phys. Rev. St. Accel. Beams 18 (2015) 111002.

[27] [27] https://frib.msu.edu/.

[28] [28] J. Yang, J. Xia, G. Xiao, H. Xu, H. Zhao, et al., High intensity heavy-ion accelerator facility (HIAF) in China, Nucl. Instrum. Methods Phys. Res. Sect. B 317 (2013) 263.