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研制了一套单光电子谱测试仪。对8英寸微通道板型光电倍增管(MCP-PMT)的性能指标进行了标定,包括单光电子谱的增益和峰谷比、光电阴极的均匀性。单光电子谱测试仪采用高精度QDC采集电荷谱。VME数据获取系统积分电荷谱得到单光电子谱。采用LABVIEW的电流采样系统获得光电阴极某确定位置上光电流的I-V坪曲线。单光电子谱测试仪测得MCP-PMT在高压为2100 V、脉冲发生器的设置为脉冲宽度10 ns、采样频率1 k Hz、驱动电压1.735 V驱动LED光源时,单光电子谱的增益为2.5233×107、峰谷比值为2.78,光电阴极的非均匀性小于10%。实验测得的性能指标均满足中微子探测等实验要求。同时为20英寸MCP-PMT的成功研制奠定了理论设计及测试基础。
Developed a single photoelectron spectrometer. The performance of 8-inch microchannel plate type photomultiplier tube (MCP-PMT) was calibrated, including the gain and peak to valley ratio of single photoelectron spectrum and the uniformity of photocathode. Single-photon spectrum analyzer using high-precision QDC charge spectra. The VME data acquisition system integrates the charge spectrum to obtain a single photoelectron spectrum. The current sampling system of LABVIEW was used to obtain the I-V flat curve of photocurrent at a certain position of the photocathode. Single-photon spectrum analyzer measured MCP-PMT at a high voltage of 2100 V, the pulse generator is set to pulse width of 10 ns, the sampling frequency of 1 k Hz, the driving voltage of 1.735 V drive LED light source, single-photon gain of 2.5233 × 107, peak to valley ratio of 2.78, photocathode non-uniformity of less than 10%. Experimental performance measured to meet the neutrino detection and other experimental requirements. At the same time, it has laid the theoretical design and test basis for the successful development of 20-inch MCP-PMT.