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BE Seminar
Emittance growth induced by electron cloud in CERN proton rings
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Europe/Zurich
AB Auditorium Meyrin (CERN)
AB Auditorium Meyrin
CERN
Description
An electron cloud can build-up in the vacuum chamber of proton (and positron) rings, interact with the beam and give rise to instabilities and/or emittance growth. This talk presents numerical and analytical studies of transverse single-bunch effects induced by the electron cloud, in particular for the SPS and the LHC.
The strong head-tail instability threshold and the associated fast emittance growth are studied, as a function of beam and cloud characteristics, and the results are compared with analytical models. A mechanism for the slow incoherent emittance growth, which is still present at cloud densities below the instability threshold, is interpreted as one caused by the periodic crossing of resonances, due to a combined effect of particles synchrotron motion and electron-cloud induced tune-shift variation along the bunch.
Organiser(s): Werner Herr (AB/ABP)
More information: http://cern.ch/AB-seminar/
The strong head-tail instability threshold and the associated fast emittance growth are studied, as a function of beam and cloud characteristics, and the results are compared with analytical models. A mechanism for the slow incoherent emittance growth, which is still present at cloud densities below the instability threshold, is interpreted as one caused by the periodic crossing of resonances, due to a combined effect of particles synchrotron motion and electron-cloud induced tune-shift variation along the bunch.
Organiser(s): Werner Herr (AB/ABP)
More information: http://cern.ch/AB-seminar/