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Title: Improved time response for large area microchannel plate photomultiplier tubes in fusion diagnostics

Fusion diagnostics that utilise high speed scintillators often need to capture a large area of light with a high degree of time accuracy. Microchannel plate (MCP) photomultiplier tubes (PMTs) are recognised as the leading device for capturing fast optical signals. However, when manufactured in their traditional proximity focused construction, the time response performance is reduced as the active area increases. This is due to two main factors: the capacitance of a large anode and the difficulty of obtaining small pore MCPs with a large area. Collaboration between Photek and AWE has produced prototype devices that combine the excellent time response of small area MCP-PMTs with a large active area by replacing the traditional proximity-gap front section with an electro-optically focused photocathode to MCP. We present results from both single and double MCP devices with a 40 mm diameter active area and show simulations for the 100 mm device being built this year.
Authors:
; ;  [1] ;  [2]
  1. Photek Ltd, 26 Castleham Road, St Leonards on Sea, East Sussex, TN38 9NS (United Kingdom)
  2. AWE, Aldermaston, Reading, Berkshire, RG7 4PR (United Kingdom)
Publication Date:
OSTI Identifier:
22308995
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCURACY; ANODES; CAPACITANCE; MICROCHANNEL ELECTRON MULTIPLIERS; PHOSPHORS; PHOTOCATHODES; PHOTOMULTIPLIERS; SPECTRAL RESPONSE; THERMONUCLEAR REACTIONS; TIME DEPENDENCE; VISIBLE RADIATION