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- W1414901261 abstract "Publisher Summary This chapter describes the proximity focused image intensifier with GaAs photocathode. The technology of incorporating a GaAs photocathode with an active area 18 mm in diameter into an image intensifier is presented. The tube includes a photocathode support cup, a component that is not required when an S.20 photocathode is used. This support cup has only limited heat conduction to the body of the tube, thereby allowing the required heat clean temperature to be attained by radiant heating. The caesium source used is an SAES channel. Direct caesitation can contaminate the photocathode due to impurities generated by the caesium channel. The use of a glass U-bend between the caesium channel and the photocathode reduces the risk. After normal outgassing of the channel, the caesium generated is trapped in the U-bend by cooling this with an ice bath. Gaseous impurities are not condensed and are pumped away. It is found that reflection sensitivities of 1000 to 1100 μA lm−1 were attained not only using the ion pumped system but also using mercury diffusion pumped system with two cold traps." @default.
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- W1414901261 date "1976-01-01" @default.
- W1414901261 modified "2023-09-25" @default.
- W1414901261 title "Proximity Focused Image Intensifier with GaAs Photocathode" @default.
- W1414901261 cites W1974536205 @default.
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- W1414901261 doi "https://doi.org/10.1016/s0065-2539(08)61455-9" @default.
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