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Hamamatsu single anode R7761 and multi-anode R5900-00-M16 PhotomultiplierTubes have been characterized for use in a Secondary Emission (SE) IonizationCalorimetry study. SE Ionization Calorimetry is a novel technique to measureelectromagnetic shower particles in extreme radiation environments. Thedifferent operation modes used in these tests were developed by modifying theconventional PMT bias circuit. These modifications were simple changes to thearrangement of the voltage dividers of the baseboard circuits. The PMTs withmodified bases, referred to as operating in SE mode, are used as an SE detectormodule in an SE calorimeter prototype, and placed between absorber materials(Fe, Cu, Pb, W, etc.). Here, the technical design of different operation modes,as well as the characterization measurements of both SE modes and theconventional PMT mode are reported.

Characterization of photomultiplier tubes in a novel operation mode for Secondary Emission Ionization Calorimetry