Results from a prototype beam monitor in the Tevatron using synchrotron light
A prototype synchrotron light monitor has been installed in the Tevatron at the downstream edge of a superconducting dipole magnet. Synchrotron light produced at the upstream edge of the magnet is sufficiently separated from the proton beam to be picked off by the monitor's mirror and diverted to its detector. It is shown that the way to enrich the low-wavelength region is to rely either upon short magnets (or an undulator which is a series of short magnets) or the sharp transition between the zero field region and the full-field region of a dipole magnet. The measured light intensity at different beam energies was compared to the predicted values. The parameters of a beam profile monitor are discussed.<<ETX>>
Proton Synchrotron Radiation Diagnostics at HERA
At HERA a proton synchrotron radiation beam emittance monitor has been installed which utilizes the radiation produced in the fringe field of a vertical deflecting dipole magnet. The beam spot is imaged onto the chip of a standard CCD camera by means of a concave mirror. An interference filter together with a polarization filter serve for resolution improvements. While the monitor was used for the first time in standard operational mode during the previous HERA run period, the set‐up was improved in the last shut‐down. With start of the new run period the monitor is in a stage of re‐commissioning and the first results are presented.
Investigations of dielectric gratings using electrodynamic models based on volume integral equations
Eigenmodes of planar and cylindrical dielectric gratings (DGs) and electromagnetic wave scattering from multiplayer DGs are investigated. The DG characteristics are calculated using numerical-analytical solution of integral equations (IEs).