  ICARUS T600 will be operated as far detector of the Short Baseline Neutrino
program at Fermilab (USA), which foresees three liquid argon time projection
chambers along the Booster Neutrino Beam line to search for a LSND-like sterile
neutrino signal. The detector employs 360 photomultiplier tubes, Hamamatsu
model R5912-MOD, suitable for cryogenic applications. A total of 400 PMTs were
procured from Hamamatsu and tested at room temperature to evaluate the
performance of the devices and their compliance to detect the liquid argon
scintillation light in the T600 detector. Furthermore 60 units were also
characterized at cryogenic temperature, in liquid argon bath, to evaluate any
parameter variation which could affect the scintillation light detection. All
the tested PMTs were found to comply with the requirements of ICARUS T600 and a
subset of 360 specimens was selected for the final installation in the
detector.
