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After modifying the code of magnetic field, the simulation got a lot faster. The reason why it still takes a lot of time after the ion hit the detector might due to the great many secondary particles generated. The magnetic field is also applied to them. That is perhaps why my simulation got a lot faster when a simple magnetic field was applied. So far, I only need the kinetic energy, the position of the Kr78 and the global time (about 47ns) when it hits the detector. Can I just kill all the secondary particles without affecting the information I need? Or I may end one event as soon as Kr 78 reaches the end of the world. For further work, I will need to know the total energy deposition of every chamber. Do I have any approaches to make it faster besides improving the method of getting the magnetic field value?