Observation of soft-x-ray spatial coherence from resonance transition radiation
Piestrup, M. A.
Boyers, D. G.
Pincus, C. I.
Hallewell, G. D.
Moran, M. J.
Skopik, D. M.
Silzer, R. M.
Maruyama, X. K.
Snyder, D. D.
Rothbart, G. B.
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We have observed the spatial distribution of coherent or resonant transition radiation (RTR) in the soft-x-ray region of the spectrum (1-2 keV). Resonance transition radiators were constructed and tested at two accelerators using electron-beam energies ranging from 50 to 228 MeV. These radiators emitted soft x-rays in a circularly symmetrical annulus with a half-angle divergence of 2.5-9.0 mrad. The angle of peak emission was found to increase with electron-beam energy, in contrast to the incoherent case, for which the angle of emission varied inversely with electron-beam energy. By careful selection of foil thickness and spacing, one may design radiators whose angle of emission varies over a range of charged-particle energies. A particular RTR mode (r=m=1) was found to give a sharp annular ring that becomes more accentuated as the number of foils is increased. The RTR effect has application in particle detection, beam diagnostics, x-ray source brightness enhancement, and x-ray free-electron-laser emission.
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