Abstract
A 5-inch microspot tube with a spot size of 8 to 9 microns and a beam current of 1.5 µa is described. The neck of this tube uses an accelerating spiral anode, in combination with a decelerating prefocus lens. This combination stretches the 6-inch neck structure to an effective length of 13 to 16 inches. The resulting demagnification of 0.6 permits realizing the above spot size as an electron image of a 1/2 mil object-aperture. The latter is illuminated with a current density of 20a/cm2by a microgun, which uses an impregnated cathode at 2a/cm2. The microgun operates by the FRM principle (Focus Reflex Modulation). An improved vapor-reacted screen is employed, whose light output is more than tripled from previous types of transparent phosphors.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
