Fig. 1. Field curvature analysis of single magnetic lens system

Fig. 2. Field curvature analysis of double magnetic lens system

Fig. 3. (a) Imaging model of framing converter tube with double magnetic lens system; (b) distribution of magnetic field of two systems on the axis

Fig. 4. Variation of spatial resolution with off-axis distance for two systems

Fig. 5. Curved image surfaces obtained by computer simulation for (a) single magnetic lens and (b) double magnetic lens systems

Fig. 6. Schematic of experimental system

Fig. 7. Testing results under different excitation currents for single magnetic lens system. (a) I=0.344 A; (b) I=0.341 A; (c) I=0.335 A

Fig. 8. Testing results under different excitation currents for double magnetic lens system. (a) I1=0.240 A, I2=0.385 A; (b) I1=0.230 A, I2=0.385 A; (c) I1=0.220 A, I2=0.385 A; (d) I1=0.200 A, I2=0.385 A; (e) I1=0.180 A, I2=0.385 A

Fig. 9. Curved image surfaces fitted by measuring data for double magnetic lens system