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Recent Progress of Research and Development for the Cost Effective, Energy Efficient Proton Accelerator CYCIAE-2000 | |
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Funding: This work was supported in part by the National Natural Science Foundation of China under Grant 12135020 and the basic research fund from the Ministry of Finance of China under Grant BRF201901 The MW class proton accelerators are expected to play important role in many fields, attracting institutions to continue research and tackle key problems. The CW isochronous accelerator obtains high power beam with higher energy efficiency, which is very attractive to many applications. Scholars generally believe that the energy limitation of the isochronous cyclotron is ~1GeV. In order to get higher beam power by the isochronous machine, enhancing the beam focusing become the most important issue. Adjusting the radial gradient of average magnetic field make the field distribution match the isochronism. When we adjust the radial gradient of peak field Bhill, the first order gradient is equivalent to the quadrupole field, the second order, to the hexapole field, and so on. Just like the synchrotron, there are quadrupole, hexapole magnet and so on, along the orbits so as to get higher energy, as all we know. If we adjust the radial gradient for peak field of an FFAG’s FDF lattice, and cooperate with the angular width (azimuth flutter) and spiral angle (edge focusing) of the traditional cyclotron pole, we can control the working path in tune diagram very flexibly. During enhancing the axial focusing, the beam intensity and energy of CW isochronous accelerator are significantly increased. And a 2GeV CW FFAG with 3mA of average beam intensity are designed. It is essentially an isochronous cyclotron although we use 10 folder of FDF lattices. The key difficulty is that the magnetic field and each order of gradient should be accurately adjusted in a large radius range. As a high power proton accelerator with high energy efficiency, we adopt high temperature superconducting (HTS) technology for the magnets. 15 RF cavities with Q value of 90000 provide energy gain per turn of ~15MeV to ensure the CW beam intensity reaches 3mA. A 1:4 scale, 15 ton HTS magnet and a 1:4 scale, 177MHz cavity have been completed. The results of such R & D will also be presented in this paper. |
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