Performance of transmission dynode photomultipliers in magnetic fields up to 1.5 T

The performance of commercially available photomultiplier tubes with 1, 2, 8 and 16 parallel transmission dynodes is examined in homogeneous magnetic fields B with strengths up to 1.5 T and axial as well as nonaxial orientations. The samples with 16 dynodes allow an operation with gains G ≥ 103 and time resolutions σ ≤ 230 ps in such strong fields and for tilting angles θ ≤ 50°. The dependence of relative gain G/G(B = 0) and time resolution σ on B and θ is less expressed for the PMs with the smaller numbers of dynodes and a more compact design. The influence of B(θ) on the transit time is discussed qualitatively