Interference of diffraction and transition radiation and its application as a beam divergence diagnostic

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...

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Bibliographic Details
Published in:Physical review special topics. PRST-AB. Accelerators and beams 2006-05, Vol.9 (5), p.052802, Article 052802
Main Authors: Fiorito, R. B., Shkvarunets, A. G., Watanabe, T., Yakimenko, V., Snyder, D.
Format: Article
Language:English
Subjects:
COMPUTERIZED SIMULATION
DIFFRACTION
Diffraction radiation
ELECTRON BEAMS
Finite element method
Foils
Interference
MIRRORS
national synchrotron light source
NUCLEAR PHYSICS AND RADIATION PHYSICS
Open spaces
Optical transition
Radiation
RADIATION TRANSPORT
RADIATIONS
Relativistic electron beams
SCREENS
TRANSITION RADIATION
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Summary: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.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.9.052802