The photomultiplier tube testing facility for the Borexino experiment at   LNGS
  A facility to test the photomultiplier tubes (PMTs) for the solar neutrino detector Borexino was built at the Gran Sasso laboratory. Using the facility 2200 PMTs with optimal characteristics were selected from the 2350 delivered from the manufacturer.   The details of the hardware used are presented. 
A.Brigatti, A.Ianni, P.Lombardi, G.Ranucci, and O.Smirnov