A variety of seaframing/synchroscan image tubes are now under design and manufacturing in the Department of Photoelectromcs, General Physics Institute. Among them are: a series ofthe well-known PVOO1 image tubes introduced into wide practice since 1978, a set of more advanced PIFOO1 tubes originally designed in 1979, specially developed femtosecond streak tubes ofBSV-type, which were initially proposed in 1987, and finally a number ofPF-type tubes placed in service last year. The whole set of these image tubes may cover the spectral range from 1 15 nm up to 1 .55 him, providing maximum sensitivity of 0.5 tA/W at 1 .55 tm (SluR) and up to 3 mAJW at 900nm (525/ER). Various input photocathode windows may be used: fibre-optics or borosilicate substrates which blue transparency starts at 350 nm, UV-glass windows (>200 nm), MgF2 input window (>1 15 mu). All tubes with photocathode-accelerating mesh geometry have photocathode area of 6mm in diameter, while the tubes in non-mesh configuration (PV and PF) have a rectangular photocathode area of not less than 4mm by 18mm. The described tubes may be supplied with any type of phosphor screen (red, orange, blue, green) deposited onto fibre-optics faceplate.
In contrast to the conventional image intensifier with large work area, a streak image tube should possess additional important feature -the comparatively small temporal distortion at the entire work area of the photocathode. With this additional engineering restriction taken into account, a novel small-size meshless streak image tube has been developed by means of numerical optimization. The tube with 25-mm wide work area contains a pair of deflection plates to sweep the electron image along the 25 mm output phosphor screen that is separated by 100 mm from the photocathode. The electron image can be shuttered with a 300 V blanking electric pulse. Electron-optical magnification of the tube is unit; spatial resolution reaches 30 lp/mm over the entire photocathode work area; temporal resolution lies in the 20 -50 ps range, depending on the accelerating voltage (6 -15 kV).
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