公开(公告)号：US06462324B1

公开(公告)日：2002-10-08

申请号：US09456581

申请日：1999-12-08

Applicant: Joseph Warren Wright ,  Anita Sreepadraj Venkatarao ,  Sanders Carl McComsey

Inventor： Joseph Warren Wright ,  Anita Sreepadraj Venkatarao ,  Sanders Carl McComsey

IPC: H01J4306

CPC classification number: H01J43/06

Abstract: 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.

Abstract translation: 光电倍增管包括光电阴极和具有输入和输出孔的主要倍增管。 场隔离网位于主倍增极的输入孔处，以便于将电子从光电倍增管的光电阴极收集到主倍增极，同时同时静电地屏蔽来自光电阴极的二次发射电子。 场隔离网具有中心开口，其尺寸被设计成使得光电子从光电阴极到主倍增极的吞吐量最大化，同时在主倍增极附近提供有效的场隔离。 场隔离网中的中心开口提供了在制造期间允许光发射材料在倍增极表面上均匀沉积的进一步优点。 在替代实施例中，主要倍增电极的场隔离网形成为两个段。 第一段设置在主倍增电极的输入孔中，第二段设置成与第一段偏移，间隔的平行关系。 根据所公开的发明的光电倍增器与其他类似结构的已知光电倍增管相比，提供了电子收集效率，脉冲高度分辨率和磁敏感性的显着改进。