  We investigated the use of Hamamatsu fine-mesh photomultiplier tube
assemblies H6152-70 and H6614-70 with regards to their gain and timing
resolution in magnetic fields up to 1.9 T. Our results show that the H6614-70
assembly can operate reliably in magnetic fields exceeding 1.5 T, while
preserving a reasonable timing resolution even with a gain reduction of a
factor of approximately 100. The reduction of the relative gain of the H6152-70
is similar to the H6614-70's near 1.5 T, but its timing resolution worsens
considerably at this high field.
