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Excepting the electromagnetic theory of the electrostatic lens,
this thesis appreciates the design and construction of the low-
energy electron gun by myself with the report of the test.
Principles of design, materials and mechanical work are also
presented. The field lens is used for design the electron gun.
It makes the electron beam from the source can be focused by a
variable energy range without changing the position of the
image. But it's useless for reaction of molecular beam and
electron beam. So this thesis described the simpler focusing
lens system , and the problem found in the correction of the
lower-energy electron beam.
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