Electron and ion beam simulations for the BNL ExtendedEBIS at Brookhaven National Laboratory

To investigate the influence of the dip in magnetic field between the two superconducting solenoids in the design of the BNL ExtendedEBIS, we calculated electron and ion trajectories with space charge effect of the electron beam, but neglecting the space charge of the ions. The results showed that the area of the phase space plots of the ions is conserved because of the helical pitch of radial oscillations is short compared with the scale length for changes of the axial magnetic and electric field. Consequently, the ion trajectories will not be greatly affected after passing through the dip in magnetic field.To investigate the influence of the dip in magnetic field between the two superconducting solenoids in the design of the BNL ExtendedEBIS, we calculated electron and ion trajectories with space charge effect of the electron beam, but neglecting the space charge of the ions. The results showed that the area of the phase space plots of the ions is conserved because of the helical pitch of radial oscillations is short compared with the scale length for changes of the axial magnetic and electric field. Consequently, the ion trajectories will not be greatly affected after passing through the dip in magnetic field.