title: First observation of the point spread function of optical transition radiation.
abstract: We represent the first experimental observation of the point spread function (PSF) of optical transition radiation (OTR) performed at KEK-Accelerator Test Facility extraction line. We have demonstrated that the PSF vertical polarization component has a central minimum with a two lobe distribution. However, the distribution width varied significantly with wavelength. We assume that we observed a severe effect from spherical or chromatic aberrations which are not taken into account in any existing theoretical model. We believe that the result of this work will encourage theoreticians to continue developing the theory as it is important for various transition radiation applications. Nonuniform distribution of the OTR PSF creates an opportunity for developing a submicrometer transverse beam size monitor.
authors: John Adams Institute at Royal Holloway, University of London, Egham, Surrey, TW20 0EX, United Kingdom. karataev@pp.rhul.ac.uk
authors: Pavel
authors: P
authors: Karataev
authors: Alexander
authors: A
authors: Aryshev
authors: Stewart
authors: S
authors: Boogert
authors: David
authors: D
authors: Howell
authors: Nobuhiro
authors: N
authors: Terunuma
authors: Junji
authors: J
authors: Urakawa