Abstract
The operating characteristics of photomultipliers with multialkali and bialkali photocathodes at low temperatures have been investigated. The photomultipliers were cooled down with liquid nitrogen and exposed to light led by an optical fiber. A blue LED was chosen as light source to stimulate the spectrum where most scintillators emit. The bialkali photomultipliers, which are most popular nowadays, showed a rapid decrease in the output response below -110°C and no response around -130°C. Multialkali photomultipliers could be operated normally with small decrease even at -190°C.
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