Characteristics of the radiation emitted by protons and antiprotons in an undulator

Abstract

2014 Les distributions angulaires et spectrales du rayonnement visible émis par un faisceau de protons de haute énergie dans un onduleur ont été mesurées pour la première fois. Le même dispositif a également permis l'observation visuelle directe d'un faisceau d'antiprotons. Les interférences entre les rayonnements dus aux bords des aimants de courbure et ceux propres à l'onduleur ont été observées par l'analyse de la distribution angulaire. Abstract. 2014 Spectral and angular distribution of visible radiation emitted by a high energy proton beam in an undulator have been measured for the first time. The same device has also allowed the direct visual observation of a beam of antiprotons. Interference in the radiation from two magnet edges and that between the edges and the undulator has also been seen in the angular distribution.

Synchrotron Radiation

“…The magnet edge, ∆L ~ 0.1 cm, was much shorter than the value of L o = 2.5 m, and so the radiation emitted by the edge of the magnet had a critical wavelength of about 0.6 µm, in the visible range. Later a special undulator magnet, which can be considered to be a series of short magnets with length smaller than L o , was installed to produce visible radiation from both protons and anti-protons [44]. More recently a visible light beam monitor was also tested in the Tevatron using the edge-effect [45].…”

Proton Synchrotron Radiation Diagnostics at HERA

“…5 cannot be parameterized in a simple form by an analytical expression as given in Eq. (2). Therefore in order to describe the resolution broadening effects in both planes calculations have been performed with the computer code SRW [8].…”

“…The fringe field between two successive dipole magnets was used for radiation generation. While this monitor worked only at energies above about 270 GeV it was replaced later by an undulator which extended the usable energy range [2]. A similar beam profile monitor has been installed at the Tevatron where synchrotron light produced from protons (antiprotons) at the upstream edge of a superconducting magnet is observed [3].…”

Low frequency interference between short synchrotron radiation sources

“…The present low frequency formalism allows retrieving these results and generalizing to arbitrary strength dipoles. 2 Figure 4 schemes a typical configuration of interfering edges and defines the straight particle trajectory between the two dipoles as the origin for the observation direction angular coordinate w. Figure 4 also shows typical electric field impulse doublet II E s,p ͑w, c, t͒ d͑t 1 T ͞2͒ ‫ء‬ E 1s,p 1 d͑t 2 T ͞2͒ ‫ء‬ E 2s,p so generated [Eqs. (7) and (11) with N 2 and T 1 2T 2 T ͞2].…”

“…Electron and proton synchrotron radiation (SR) interference has long been subject to investigations (see, for instance, [1,2]). Yet, considering the lasting interest in SR for such a purpose as beam diagnostics in electron and TeV-range proton installations [3,4], or for infrared production [5], enriched insight in interference phenomena in the low frequency range and their understanding remain of interest.…”