Fig. 1. LED modulation circuit

Fig. 2. Anode and photocathode parts of light-controlled pulsed X-ray tube

Fig. 3. Focus simulation of the electron emitted from photocathode

Fig. 4. Schematic diagram of the light-controlled pulsed X-ray tube

Fig. 5. Simulation on light intensity distribution at different distance

Fig. 6. Schematic diagram of the experiment to the modulation ability of X-ray tube

Fig. 7. Range of tube current in different anode voltage with different LED

Fig. 8. The relationship between LED power and tube current

Fig. 9. Change rate of X-ray photon number under different tube current

Fig. 10. Restored waveform situation with input signal in different frequencies

Fig. 11. Gaussian pulse contour restoration under different anode voltages