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Author Liao, Yubo ♦ Lei, Yunfei ♦ Cai, Houzhi ♦ Bai, Yanli ♦ Liu, Jinyuan
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ ANODES ♦ ELECTRIC POTENTIAL ♦ ELECTRON BEAMS ♦ EXCITATION ♦ IMAGE CONVERTERS ♦ IMAGES ♦ INTERFERENCE ♦ LENSES ♦ PERIODICITY ♦ PHOTOCATHODES ♦ PULSES ♦ ROTATION ♦ TUBES ♦ TWO-DIMENSIONAL CALCULATIONS
Abstract An image converter tube with a magnetic lens was used to obtain static images of moiré fringes formed by electron beam. These moiré fringes are formed due to the interference between the anode mesh and the photocathode containing slits of various spatial frequencies. Moiré fringes are observed at an accelerating voltage of 3.5 kV requiring the magnetic excitation condition of ∼550 ampere-turns. Not only the features of the fringes are analyzed but also the change of fringe spacing as a function of the rotation angle is investigated. The experimental results are found well in agreement with the theoretical analysis. By changing the rotation angle or adjusting the excitation condition of the magnetic lens, we were able to record parallel moiré and secondary moiré fringes too. The secondary moiré fringes can be observed in the rotation angle range of −39.5° to −50.6°. The theoretical analysis indicates that the secondary moiré is formed by the interference between the photocathode slits and the 2-D periodic structure of the anode mesh. Combining our proposed moiré method with the pulse-dilation technique may potentially open the door for future applications, in various fields including, but not limited to, ultrafast electrical pulse diagnostics.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-06-07
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 119
Issue Number 21


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