title: Analogue saturation limit of single and double 10 mm microchannel plate photomultiplier tubes.
abstract: Photek are a well-established supplier of microchannel plate (MCP) photomultiplier tubes (PMTs) to the inertial confinement fusion community. The analogue signals produced at the major inertial confinement fusion facilities cover many orders of magnitude, therefore understanding the upper saturation limit of MCP-PMTs to large low rate signals takes on a high importance. Here we present a study of a single and a double MCP-PMT with 10 mm diameter active area. The saturation was studied for a range of optical pulse widths from 4 ns to 100 ns and at a range of electron gain values: 103to 104for the single and 104to 106for the double. We have shown that the saturation level of ∼1.2 nC depends only on the integrated charge of the pulse and is independent of pulse width and gain over this range, but that the level of charge available in deep saturation is proportional to the operating gain.
authors.affiliation: Photek Ltd., 26 Castleham Road, St Leonards on Sea, East Sussex TN38 9NS, United Kingdom.
authors.forename: J S
authors.initials: JS
authors.lastname: Milnes
authors.affiliation: Photek Ltd., 26 Castleham Road, St Leonards on Sea, East Sussex TN38 9NS, United Kingdom.
authors.forename: T M
authors.initials: TM
authors.lastname: Conneely
authors.affiliation: AWE Aldermaston, Reading, Berkshire RG7 4PR, United Kingdom.
authors.forename: C J
authors.initials: CJ
authors.lastname: Horsfield