Further work to modify an EMI 2-stage image intensifier to be suitable for a spaceborne astronomical instrument on S.T.

Details Further work to modify an EMI 2-stage image intensifier to be suitable for a spaceborne astronomical instrument on S.T. Further work to modify an EMI 2-stage image intensifier to be suitable for a spaceborne astronomical instrument on S.T.

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978stin...7911112a&link_type=abstract

Summary Final Report EMI Electronics Ltd., Hayes (England). Electron Tube Div.

Astronomy and Astrophysics

Astronomy

Foci, Image Intensifiers, Magnetic Lenses, Spaceborne Telescopes, Environmental Tests, Far Ultraviolet Radiation, Magnesium Fluorides, Photocathodes, Ruggedness, Spacecraft Launching, Vibration Tests, Windows (Apertures)

Scientific paper

Investigations on increasing the ruggedness of the EMI type 9916 2-stage magnetically focused cascade image intensifier, on the extension of the spectral response into the vacuum ultraviolet region, on the resistance to a spacecraft launch and on the operation in a spaceborne astronomical instrument are reported. Methods of sealing magnesium fluoride windows to the intensifier and improving the photocathode response on this material by initial control of the photocathode activation were found. Life tests of S20 photocathodes on magnesium fluoride in test cells were carried out and no sign of deterioration was observed after 28 months. Theoretical and practical studies were made to determine the conditions likely to produce damage on 2-stage tubes due to light overload. Six ruggedized tubes incorporating magnesium fluoride windows were made. Two of these were encapsulated in low outgassing rate materials and have withstood typical spacecraft vibration, acoustic, and pressure environments. The image intensifier will be used in the Faint Object Camera for application in the Space Telescope.

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