Improvement of 20 in. diameter photomultiplier tubes
نویسندگان
چکیده
The quality of the 20 in . photomultiplier tubes (Hamamatsu R1449) has been greatly improved over the required specifications for using them m the 50000 ton imaging water Cherenkov detector, Super-Kamiokande . In particular, the resolution of the timing response for single-photoelectron light has been reduced to 3 ns (1Q width), and a clear single-photoelectron peak can be seen in the pulse height distribution . The obtained characteristics of the new tubes will make it possible to upgrade the performance of the Super-Kamiokande detector. The goal of the improvement, the procedure for designing the new tubes and the measuring results concerning the characteristics are described in detail .
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