Abstract
An anomalous growth of the horizontal coupled bunch modes of the bunched beam is observed in the Cornell Electron Storage Ring. In contrast with instabilities caused by electromagnetic wake fields, the growth rate is a highly nonlinear function of the bunch charge. We show that this effect is due to photoelectrons produced by synchrotron radiation which are trapped in the beam chamber by the bending magnet field and a quadrupole electrostatic field. We have developed a numerical simulation and an analytical model of this process.
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