Speaker
Description
The China Institute of Atomic Energy proposes an H2+ high-current separated-sector cyclotron facility as a continuous neutron source, targeting a 150 MeV, 10 mA proton beam after stripping extraction. The RFQ front end is designed for pre-acceleration and injection matching into the second-stage cyclotron. The matching requirements include low-loss transport through the RFQ and transfer line, envelope and phase-space matching at the cyclotron entrance, control of bunch length, phase width and energy spread, and mitigation of space-charge effects. A 50.85 MHz four-rod RFQ is optimized with RFQGen to accelerate and bunch a 30 keV, 8 mA H2+ beam to 2.03 MeV with 97.07% transmission. For the RFQ-exit beam above 7.5 mA, an injection line with quadrupole magnets, bending magnets and a double-gap buncher is designed for focusing, deflection, compression and six-dimensional phase-space matching. TRANSPORT, OPAL and CST simulations show that the 14 m line keeps beam loss below 10%, and for beam currents above 5 mA the phase width remains within 60 degrees. These results provide a beam-dynamics basis for subsequent optimization.
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