Photomultiplier tube which is insensitive to high magnetic fields
AssigneeU.S. Philips Corporation
InventorPierre L'hermite
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Abstract
A photomultiplier tube which is insensitive to high magnetic fields comprises a photocathode deposited on a transparent window at the end of an insulating casing. The multiplier tube comprises a single amplifier stage comprising a dynode. The dynode is a metallic sheet with a circumference substantially surrounding the photocathode. A layer of a secondary emissive material is provided on the inner face of the dynode. An anode is formed of a metallic grid which is homeomorphous to the surface of the dynode. The anode is placed parallel to and at a short distance from the inside surface of the dynode.
Claims11
A photomultiplier tube comprising:
- a transparent window;
- a thin layer of a photoemissive material on the window;
- a dynode formed of a metallic sheet with a circumference substantially surrounding the layer of photoemissive material, said dynode having an inner surface with a layer of a secondary emissive material on the inner surface;
- and
- an anode formed of a metallic grid, said anode being arranged parallel to and spaced from the inner surface of the dynode.
Dependencies are inferred from the claim text.