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Proceedings Paper

The Dynamic Range Of Four Image Converter Tubes In Nanosecond And Subnanosecond Photography
Author(s): P. Dooley; V. I. Little; S. Sim; S. Majumdar
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Paper Abstract

The relative importance of space charge inside an electrostatically focussed tube (i) near the photo-surface and (ii) at the electron trajectory cross-over point is evaluated by comparing the performance of four electrostatically focussed single stage image con-verter tubes. A 3 nanosecond long Nitrogen laser pulse was used for these experiments. The electron optics of these tubes were sufficiently varied, so that a proper evaluation of photo-cathode surface resistance could also be carried out. The results suggest that the most important area of space charge contribution for electron image degradation is the region near the photo-cathode. It was also observed that the degradation of spatial resolution, for an image tube with high photo-cathode conductivity and more than 2 KV/cm2 electric field near the Rhoto-cathode, was not significant until the photo-current density reached above 40 ma/cm'. This current density is much greater than that normally available from picosecond streak tubes, if good time resolution is expected from these tubes. In the light of these experiments, the importance of vacuum space charge in an image tube for picosecond time resolution is discussed.

Paper Details

Date Published: 14 September 1977
PDF: 8 pages
Proc. SPIE 0097, 12th Intl Congress on High Speed Photography, (14 September 1977); doi: 10.1117/12.955196
Show Author Affiliations
P. Dooley, Royal Holloway College (England)
V. I. Little, Royal Holloway College (England)
S. Sim, Royal Holloway College (England)
S. Majumdar, Royal Holloway College (England)

Published in SPIE Proceedings Vol. 0097:
12th Intl Congress on High Speed Photography
Martin C. Richardson, Editor(s)

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