Abstract
We propose a new method to significantly increase the quantum efficiency of a photomultiplier tube by employing a multi-photocathode and a mirror to produce photoelectrons by reusing photons transmitted by a single photocathode . In order to estimate the expected performance of the new photomultiplier, we studied the spectral responses of the reflectance, transmittance , and quantum efficiency of a K 2 CsSb photocathode as a function of the wavelength of incident light. A large enhancement of the quantum efficiency is expected in the regions between λ =280 and 650 nm.
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