Fig. 1. Structure diagram of the test system for X-ray single photon detector photon arrival time accuracy

Fig. 2. Real picture of the test system for X-ray single photon detector photon arrival time accuracy

Fig. 3. Real picture of X-ray modulation tube

Fig. 4. Structure diagram of X-ray modulation tube

Fig. 5. Measured relationship between normarized X-ray intensity and modulation pole voltage

Fig. 6. APD detector receiving X-ray pulse photon signal

Fig. 7. Measurement mode of time-marked photon counter

Fig. 8. The modulating pole control signal waveform

Fig. 9. Distribution of detector time response delay

Fig. 10. Gaussian fitting curve of the detector time response delay distribution