Abstract
Simulation method for voltage in-feed and electron injection of vacuum injector is given, and verification of the simulated voltage and current is carried out. The numerical simulation for the magnetic field of solenoid is implemented, and a comparative analysis is conducted between the simulation results and experimental results. A semi-implicit difference algorithm is adopted to suppress the numerical noise, and a parallel acceleration algorithm is used for increasing the computation speed. The RMS emittance calculation method of the beam envelope equations is analyzed. In addition, the simulated results of RMS emittance are compared with the experimental data. Finally, influences of the ferromagnetic rings on the radial and axial magnetic fields of solenoid as well as the emittance of beam are studied.
Highlights
The linear induction accelerator (LIA) is a device which accelerates charged particles so that electrons can gain very high energy
Simulation study is an important means of injector research
It can speed up the progress of injector research saving huge human and material resources
Summary
The linear induction accelerator (LIA) is a device which accelerates charged particles so that electrons can gain very high energy. Most of them use the vacuum diode as beam source.[7] From another aspect, with rapid development of computer technology, people have shown great interest in simulating the interactions between electromagnetic field and particles by virtue of computer software. As a form of numerical simulation, PIC reveals the substitutive characteristics of issues related to electromagnetic field in most detailed way and has a property of general flexibility.[9] From the perspective of particle algorithm, the PIC method describes motion of particle in electromagnetic field on the foundation of laws such as Lorentz, Momentum and Impulse. As for applying PIC method on LIA injector for full-3D simulation, relevant reports are very rare. When applying PIC method, we will inevitably run into high numerical noises which lead to incorrect simulation results. A comprehensive simulation study on injector of LIA is conducted based on the Milky Way-2 high-performance platform.[16]
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