Burle Technologies, Inc.

Anita Sreepadraj Venkatarao

Charles M Tomasetti

Joseph Warren Wright

Sanders Carl McComsey

A photomultiplier tube includes a photocathode and a primary dynode having input and output apertures. A field isolating mesh is positioned at the input aperture of the primary dynode to facilitate the collection of electrons from the photocathode of the photomultiplier to the primary dynode while simultaneously electrostatically shielding secondary emission electrons from the field of the photocathode. The field isolating mesh has a central opening that is dimensioned to maximize the throughput of photoelectrons from the photocathode to the primary dynode while providing effective field isolation in the vicinity of the primary dynode. The central opening in the field isolation mesh provides the further advantage of permitting uniform deposition of photo-emissive materials on the surface of the dynode during manufacture. In an alternative embodiment, the field isolating mesh of the primary dynode is formed in two segments. The first segment is disposed in the input aperture of the primary dynode and the second segment is disposed in offset, spaced parallel relation to the first segment. The photomultiplier according to the disclosed invention provides a significant improvement in electron collection efficiency, pulse height resolution, and magnetic sensitivity compared to known photomultiplier tubes of otherwise similar construction.

Photomultiplier tube with an improved dynode aperture mesh design

A photomultiplier tube is disclosed having a first dynode array and a second dynode array oriented substantially orthogonal to the first dynode to provide a shortened profile. The first dynode array is preferably a box-and-grid dynode array and the second dynode array is preferably an in-line dynode array. A focusing electrode is positioned between the last dynode of the first dynode array and the first dynode of the second dynode array. The focusing electrode is constructed and arranged to facilitate the transfer of electrons emitted from the first dynode array to the second dynode array without generating secondary electrons.

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Macungie, PA, United States of America

Anita Sreepadraj Venkatarao