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The dark rate of single-electrons emitted from a cathode of a multi-cathodecounter may be interpreted as the effect from Hidden Photons (HPs) of Cold DarkMatter (CDM). As a tentative approach the measurements have been performed atdifferent temperatures of the counter. Preliminary results of measurements byusing a counter with a copper cathode are presented. An upper limit of4.3x10-23 for parameter ksi^2 at 2 sigma has been obtained for hypotheticalconversion of hidden photon to real photon at the metallic surface with theresulting emission of single electron. The work is considered as a pureillustration of the method and the perspectives are discussed for future searchof HPs by a multi-cathode counter.

Looking for Hidden Photon's Cold Dark Matter By Multi-Cathode Counter