Interference of diffraction and transition radiation and its application as a beam divergence diagnostic
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Authors
Fiorito, R.B.
Shkvarunets, A.G.
Watanabe, T.
Yakimento, V.
Snyder, D.
Subjects
Advisors
Date of Issue
2006
Date
Publisher
American Physical Society
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Abstract
We have observed the interference of optical diffraction radiation (ODR) and optical transition radiation (OTR) produced by the interaction of a relativistic electron beam with a micromesh foil and a mirror. The production of forward directed ODR from electrons passing through the holes and wires of the mesh and their separate interactions with backward OTR from the mirror are analyzed with the help of a simulation code. By careful choice of the micromesh properties, mesh-mirror spacing, observation wavelength, and filter band pass, the interference of the ODR produced from the unperturbed electrons passing through the open spaces of the mesh and OTR from the mirror are observable above a broad incoherent background from interaction of the heavily scattered electrons passing through the mesh wires. These interferences (ODTRI) are sensitive to the beam divergence and can be used to directly diagnose this parameter. We compare experimental divergence values obtained using ODTRI, conventional OTRI, for the case when front foil scattering is negligible, and computed values obtained from transport code calculations and multiple screen beam size measurements. We obtain good agreement in all cases.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1103/PhysRevSTAB.9.052802
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Department
Physics
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Naval Postgraduate School (U.S.)
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NPS Report Number
Sponsors
This work is supported by the Office of Naval Research and the DOD Joint Technology Office
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Format
17 p.
Citation
Physical Review Special Topics--Accelerators and Beams, v. 9 no. 052802, 2006, pp. 1-17
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.