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 beam profile measurements with synchrotron light
Abstract In circular proton accelerators, the synchrotron radiation emitted by high energy beams at the edges of bending magnets contains an appreciable amount of visible light. This effect is used in the CERN SPS to measure by a non interceptive method the transverse proton density distribution above 200 GeV. The device consists of a telescope followed by an image sensor and electronics processing; its performances and some examples of applications are given in this paper.
On synchrotron radiation in non-uniform magnetic fields
Abstract We study the conditions in which a charged particle in an inhomogeneous magnetic field (particularly at the edges of a “long” uniform magnet or in a “short” magnet) can emit synchrotron radiation with a spectrum extending beyond the “critical frequency”. We suggest that this effect should be clearly visible (and also useful) in the case of very high energy proton storage rings.