Large Hadron Collider Project

Abstract:  The paper presents new simulation results for the beam-induced electron cloud in the LHC beam screen. All simulations are carried out using an improved two-dimensional module for the space charge and image charge calculations. The work gives a systematic investigation of the dependence of the heat load on several parameters and gives a brief discussion of possible cures. The work investigates only the regions with strong vertical magnetic field. Administrative Secretariat LHC Division CERN CH-1211 Geneva 23 Switzerland Geneva, 7 November 1 Introduction The synchrotron radiation in the LHC creates a continuous flow of photo-electrons. These electrons are accelerated by the electric field of the bunch and hit the vacuum chamber on the opposite side of the beam pipe where they create secondary electrons which are again accelerated by the next bunch. In the field free regions, the accelerated electrons move radially towards the beam center and the particle dynamics is a one-dimensional ...