High Power Laser and Particle Beams, Volume. 37, Issue 4, 044006(2025)
Simulation design of an S-band 6 MeV compact microtron
Ziqiang Dong1,3, Shilun Pei4, Tong Zhang1,3, Zhuoxia Shao1,3、*, Lin Wang2, and Yalin Lu1,3
Author Affiliations
1Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China2National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China3Anhui Laboratory of Advanced Photon Science and Technology, University of Science and Technology of China, Hefei 230026, China4China Institute of Atomic Energy, Beijing 102413, Chinashow less
The Anhui Laboratory of Advanced Photon Science and Technology has beer developing a 6 MeV compact microtron, which can be used to drive compact microfocus X-ray sources or compact terahertz free electron lasers. To achieve a more compact accelerator design, the CST Electromagnetic suite was used to design and calculate the second type RF cavity of the microtron. The frequency of the RF cavity is 2998.2 MHz, and an accelerating voltage of over 1 MV can be obtained in the RF cavity gap. The electron energy gain can reach about 0.9 MeV per pass. At the same time, CST Particle Studio was used to simulate the electron generation and acceleration process in the ultra-high frequency cavity with thermionic cathode. The effects of microwave power amplitude, magnetic field strength, cathode emission position, and beam channel on the microtron were studied. The coupler design considering beam loading was also completed, and the operating parameters of the RF cavity during steady-state operation were obtained. The simulation results show that when the beam loading reaches steady state, with a cathode emission capacity of 20 A/cm2, a current of 24 mA can be induced, a beam energy of 6 MeV, an energy spread of 0.64%, and a transverse RMS size of 3.3 mm × 1.8 mm can be obtained.