研究目的
To develop a multi-functional PMT test bench with a two-dimensional scanning system for testing the photomultiplier tubes (PMTs) of the electromagnetic detector at the Large High Altitude Air Shower Observatory (LHAASO).
研究成果
A multi-channel PMT test bench with a 2D scanning system was successfully developed, enabling efficient and reliable testing of PMTs for the LHAASO project. The bench's programmable hardware and intelligent software facilitate repeatable and manual-independent testing, ensuring reliable results.
研究不足
The test bench requires the PMTs to be stored in the dark box for a few hours before testing to stabilize the dark pulse rate. The light intensity range of the laser is too narrow for some tests, and its intensity is sensitive to ambient temperature.
1：Experimental Design and Method Selection:
A multi-functional PMT test bench with a two-dimensional scanning system was developed to test 16 PMTs simultaneously for various characteristics.
2：Sample Selection and Data Sources:
PMTs from the Hamamatsu Company, Japan, specifically the R11102 type, were used for testing.
3：List of Experimental Equipment and Materials:
The test bench included a light-tight box, pulsed light sources (LED and picosecond pulse laser), high-voltage power supply, and a data acquisition system with VME and NIM crates.
4：Experimental Procedures and Operational Workflow:
The PMTs were tested for single photoelectron spectrum, gain vs. high voltage, linear dynamic range, uniformity of the photocathode, cathode transit time difference, and dark noise rate.
5：Data Analysis Methods:
Data was analyzed using ROOT histograms, with specific methods for each test characteristic.
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