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Theoretical and experimental study of the large dynamic range scan converter tube

Author: LiuHongBo
Tutor: ZhaoBaoSheng
School: Xi'an Optics and Fine Mechanics
Course: Physical Electronics
Keywords: Scan converter tube Dynamic range Time resolution Space charge effect Electro-optical systems
CLC: TN141
Type: Master's thesis
Year: 2004
Downloads: 124
Quote: 0
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Abstract


Dynamic range and temporal resolution of the scanned image converter tube is conflicting , the goal of this thesis is to develop a higher temporal resolution while maintaining at the same time , with a large dynamic range scan converter tubes for inertial confinement fusion the diagnosis of ultrafast processes provide a powerful tool . Analysis of the impact of the image converter tube time response characteristics of a variety of factors , such as photoelectron early energy dispersion ; transit time dispersion , as well as many non-linear factors affect the dynamic range of the image converter tube , such as the space-charge effect on the photoemission ; the photocathode emission electron pulse transition process ; phosphor screen current saturation effects . Fully optimized design guidelines , to determine the time - spatial modulation transfer function for the evaluation of the principle of the design of the Monte-Carlo method for the calculation means route . In the key right the influence time resolution and dynamic range of the common physical mechanisms - the space charge effect based on the analysis , to abandon the usual axially symmetrical electron-optical system , using a special design of the electron optics plane focusing cylindrical lens , shortening the focus region axial dimension, while appropriately increasing the voltage between the photoelectron in the focus region of the transit -time is reduced , thereby suppressing the role of the space-charge effect , thereby improving the dynamic range . The scanned image converter tube significantly characterized by small size , compact structure . Tube full length 190mm, focus area length 65mm deflection sensitivity 40mm/kV , time distortion . The time resolution of the theoretical design 300fs, static spatial resolution than 601p/mm . Electro-optical design based on the completion of a large dynamic range scan converter tube structure design and machining , and developed a large dynamic range scan converter tube . And the static experiments, the ideal experimental results .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Vacuum Electronics > Electron beam devices,X-ray tube, cathode ray tubes > Display
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