Fig. 1. Detection efficiency of 5 different positions of the original 5 mm thickness Veto detector unit strip under different voltages

Fig. 2. Schematic diagram of embedding 15 WLSs in Veto detector and read out by SiPM

Fig. 3. Experimental setup for testing SiPM single-photon resolution of LED systems

Fig. 4. Single photoelectron charge spectrum of SiPM illuminated by LED

Fig. 5. Linear relationship between the number of SiPM photons and ADC channels number

Fig. 6. Physical snapshot of the multiwire proportional chamber test platform

Fig. 7. Electronics test block diagram

Fig. 8. Time difference spectrum at both ends of MWPC₁ (a), spectrum calculated after differential and absolute value of the time difference spectrum at both ends of MWPC₁ (b), position spectrum of MWPC₁ after T-P relationship transformation in X direction (c)

Fig. 9. Schematic diagram of the vertical distance from Z=0 to each layer of silk surface

Fig. 10. The straight line fitted by the three position points on the XOZ plane and the effective diameter that meets the conditions

Fig. 11. Charge-magnitude spectra of veto detectors embedded in seven WLS fibers (color online)

Fig. 12. Center of 15 and 7 WLS Veto detectors is divided into 5 mm×5 mm grids, and the detection efficiency of each grid

Fig. 13. Detection efficiency of different types of Veto detectors at different positions