Fig. 1. Pulse-dilation framing camera. (a) Schematic diagram; (b) photograph

Fig. 2. Transmission photo-cathode. (a) Schematic diagram; (b) photograph

Fig. 3. Schematic of microchannel plate

Fig. 4. Magnetic lens and magnetic field strength on the axis. (a) Schematic of magnetic lens; (b) magnetic field distribution in drift region

Fig. 5. Diagram of experimental setup and grating structure. (a) Experimental setup of the spatial resolution measurement; (b) grating structure of the PC

Fig. 6. Middle PC images and corresponding grating intensity. (a) Middle PC image with double magnetic lenses; (b) middle PC image with single magnetic lens; (c) corresponding grating intensity of double magnetic lenses; (d) corresponding grating intensity of single magnetic lens

Fig. 7. Modulation of the grating versus off-axis distance. (a) Modulation curve of the single lens; (b) modulation curve of the double lenses

Fig. 8. Electron trajectory and field curvature. (a) Simulated electron trajectory of double magnetic lenses; (b) fitting of the field curvature

Fig. 9. Curved surface of image field and corresponding parameter relationship. (a) Curved surface of image field under different currents; (b) corresponding relationship between object image distance and coil current

Fig. 10. Electron dispersion of imaging points on the receiving surface at different off-axis distances. (a) On-axis imaging point; (b) imaging point at 8-mm off-axis; (c) imaging point at 20-mm off-axis

Fig. 11. Diagram of the astigmatism

Fig. 12. Middle PC images with different coil currents in second lens

Fig. 13. Tangential and sagittal spatial resolutions versus the coil current in second lens. (a) Imaging point at 4-mm off-axis; (b) imaging point at 8-mm off-axis; (c) imaging point at 15-mm off-axis; (d) imaging point at 20-mm off-axis