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OBSERVATION OF VISIBLE SYNCHROTRON RADIATION EMITTED BY A HIGH-ENERGY PROTON BEAM AT THE EDGE OF ('ER,\', (/('#l(Td, .S'u'ilT_W/'ia,qd
Rcccixcd 22 Mcuch 1079Theoretical studios ~llow il'lat (v,,,ing to the abrupt C]l,.lngc of tile lll;.ignctic l]cld occurring tit the nl,itics of the pilit(irl beam. ilS pr(fl]lc illOcistlrLqllclll i ~, h}l'CgCCll a'-, an inlnlcdiatc application.
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.
For beam intensities above 1Ol2 protons per pulse in the SPS, collective transverse beam instabilities develop with frequencies between 15 kHz and 3 MHz because of the resistive wall effect of the vacuum ' chamber]), An active feedback system2) with an electrostatic deflector has been installed in the SPS for damping the resistive wall instabilities in both the vertical and horizontal planes,
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