Behaviour in Magnetic Fields of Fast Conventional and Fine-Mesh   Photomultipliers
  The performance of both conventional and fine-mesh Hamamatsu photomultipliers has been measured inside moderate magnetic fields. This has allowed the test of effective shielding solutions for photomultipliers, to be used in time-of-flight detectors based on scintillation counters. Both signal amplitude reduction or deterioration of the timing properties inside magnetic fields have been investigated. 
M. Bonesini, R. Bertoni, A. de Bari, M. Rossella
physics.ins-det hep-ex