Fig. 1. Structural diagram of the electrostatic focusing system

Fig. 2. Dynamic magnetic focusing flying focus scanning structure of double magnetic quadrupole lens CT tube

Fig. 3. Magnetic field distribution of magnetic quadrupole lens

Fig. 4. CST simulation structure of dual magnetic quadrupole lens system

Fig. 5. Maximum magnetic field vs focal spot size in x and y axes

Fig. 6. Distribution of the magnetic field of quadrupole lens along the x-y axis

Fig. 7. Current simulation trajectory

Fig. 8. Morphology of focal spot without axial deflection current

Fig. 9. Relationship between x, y-axis of fset of focal spot and x, y-axis deflection current

Fig. 10. Add the x, y-axis deflection current deflection