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Proceedings Paper

Theoretical Analyses And Design Considerations Of A Picosecond Framing Tube
Author(s): Y. Liu; W. Sibbett; D. R. Walker
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Paper Abstract

To further improve the dynamic performances of picosecond-resolution framing cameras, a theoretical analysis has been accomplished which can simulate the dynamic trajectories of photoelectrons travelling through the entire image tube. It is shown that for the exsisting Picoframe-type camera design the spatial resolution is significantly degraded by the lensing effects of the deflectors during the dynamic framing operation. It is also shown that the minimum exposure 'frame' time for X-ray applications is limited by the reduction of the number of photoelectrons reaching the phosphor screen due to the high secondary electron energy spread. A new design of framing tube incorporating either conventional deflectors or travelling-wave deflectors has been developed. In this design, the electrostatic focusing lens has been optimized for better beam quality and higher deflection sensitivity. The defocusing effect induced by conventional deflectors has been eliminated by (i). incorporating an extra cylindrical lens into the deflection section of the tube or alternatively (ii) by utilizing travelling-wave deflectors. The theoretically predicted frame time is about 60ps(FWHM) when using conventional deflectors and less than 50ps(FWHM) with the travelling wave deflectors. The implied spatial resolution referred to photocathode is 10 1p/mm for X-rays and exceeds 15 1p/mm for UV and visible radiations.

Paper Details

Date Published: 17 January 1990
PDF: 8 pages
Proc. SPIE 1155, Ultrahigh Speed and High Speed Photography, Photonics, and Videography '89: Seventh in a Series, (17 January 1990); doi: 10.1117/12.962443
Show Author Affiliations
Y. Liu, University of St.Andrews (China)
W. Sibbett, University of St. Andrews (Scotland)
D. R. Walker, University of St. Andrews (Scotland)

Published in SPIE Proceedings Vol. 1155:
Ultrahigh Speed and High Speed Photography, Photonics, and Videography '89: Seventh in a Series
Gary L. Stradling, Editor(s)

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