Focusing transition radiation with cylindircal and elliptical optics
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Author
Votruba, Paul Matthew
Date
1991-12Second Reader
Piestrup, Melvin A.
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Show full item recordAbstract
We have demonstrated the ability of a nickel elliptical
tube to focus the conical ly diverging pattern of x-ray
transition radiation. The x-ray TR was produced by passing
moderate-energy (60 to 100 MeV) electron beams through targets
consisting of thin (1 urn) multiple foils of aluminum and
titanium. The foils were placed in a vacuum chamber; perpendicular
to the Naval Postgraduate School's linac primary
beamline. An elliptical nickel tube, with a length of 30.5
cm, was placed concentric to the axis of the conical photon
beam (as defined by the axis of the electron beam) with an
entrance and exit of 1.4 m and 1.7 m, respectively, from the
source of the TR at the end of the foil stack. The intensity
profile was subsequently measured with a linear image detector placed 3.0 m from the exit of the foil stack. Through a
series of experiments, taking into account the effects of
surface roughness, the nickel elliptical tube demonstrated the
ability to collect 3 to 5 times more energy than a cylindrical
quartz tube.
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