Selection of photomultiplier tubes for the LHAASO project

摘要

In order to select the suitable Photomultiplier Tubes (PMTs) for the LHAASO project, specialized testsystems are set up to measure the performances of different kinds of PMTs from Hamamatsu and Electron Tubes (ET),such as gain as a function of high voltage, linearity, single photoelectron spectrum, dark noise and cathode uniformity.Several types of PMTs are chosen as the candidates for the projected LHAASO detectors. In this presentation, thePMTs for LHAASO-KM2A and LHAASO-WCDA are reported.