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Proceedings Paper

A Magnet For Use With A Magnetic Image Intensifier And A Folded Schmidt Spectrograph Camera
Author(s): J. R. P. Angel
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Paper Abstract

Magnetically focussed image tubes are of special value in astronomy because they have high resolution and can be made with flat ultraviolet-transmitting windows. There has, however, been a difficulty in operating such tubes with the very fast cameras required by spectrographs for large telescopes. An ideal fast camera for imaging linear spectra is the folded Schmidt design used, for example, in the Wampler-Robinson scanner at Lick Observatory (Epps 1975). This design, which can be as fast as f/1.0, involves a folding flat directly adjacent to the tube photocathode, and the incoming light would be blocked by the solenoid in any convention-al magnet design. We have explored more complex solenoid geometries which give the very open access to the cathode while maintaining high field uniformity, and present here a design which is practical in terms of power dissipation and weight, and is also screened against external transverse fields. The design may also have application in any optical system that requires large elements and clearance near the image tube cathode.

Paper Details

Date Published: 3 May 1979
PDF: 3 pages
Proc. SPIE 0172, Instrumentation in Astronomy III, (3 May 1979); doi: 10.1117/12.957104
Show Author Affiliations
J. R. P. Angel, University of Arizona (United States)

Published in SPIE Proceedings Vol. 0172:
Instrumentation in Astronomy III
David L. Crawford, Editor(s)

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