A magnet for use with a magnetic image intensifier and a folded Schmidt spectrograph camera

Research output: Contribution to journalConference articlepeer-review


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 conventional 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.

Original languageEnglish (US)
Pages (from-to)377-379
Number of pages3
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - May 3 1979
EventInstrumentation in Astronomy III 1979 - Tucson, United States
Duration: Jan 29 1979Feb 1 1979

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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