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T: Fachverband Teilchenphysik

T 86: Beschleunigerphysik 8

T 86.6: Talk

Thursday, March 1, 2012, 18:05–18:20, VG 1.104

Simulation of Wake Potentials Induced by Relativistic Proton Bunches in Electron Clouds — •Fedor Petrov, Oliver Boine-Frankenheim, and Thomas Weiland — Technische Universität Darmstadt, Institut für Theorie Elektromagnetischer Felder (TEMF) Schlossgartenstrasse 8, 64289 Darmstadt, Germany

Electron clouds limit the intensity of modern high intensity hadron accelerators. Presently electron clouds are the main limiting factor for the LHC operation with 25 ns bunch trains. The bunches passing through an electron cloud induce a wake field. When the electron cloud density exceeds a certain threshold beam instabilities occur. The presence of electron clouds results in a shift of the synchronous phase, which increases if the bunch spacing is reduced. For LHC and SPS conditions we compare the longitudinal electron cloud wake potentials and stopping powers obtained using a simplified 2D electrostatic Particle-in-Cell code with fully electromagnetic simulations using VORPAL. In addition we analyze the wake fields induced by displaced or tilted bunches.