Author/Authors :
Paneque، نويسنده , , D. and Gebauer، نويسنده , , H.J. and Lorenz، نويسنده , , E. and Martinez، نويسنده , , M. and Mase، نويسنده , , K. and Mirzoyan، نويسنده , , R. and Ostankov، نويسنده , , A. and Schweizer، نويسنده , , T.، نويسنده ,
Abstract :
A simple method to enhance the sensitivity of photomultipliers (PMTs) will be described. The method is based on applying onto the cathode window a specially prepared lacquer containing a wavelength shifter (WLS). A rapidly evaporating lacquer solvent results in a milky surface that acts as a photon scatterer. Applying the method to the ET 9116A PMT (hemispherical borosilicate window and rubidium-bialkali photocathode) resulted in a good sensitivity in the short-wave UV range as well as a ≳20% increase above 330 nm. Details of the study, the procedure and a simple model for the explanation of the enhancement are presented.
Keywords :
Photomultipliers , Air Cherenkov telescopes , Quantum efficiency , Wavelength shifter
