Phys. Rev. Lett. 79, 3186–3189 (1997)A Trapped Photoelectron Instability in Electron and Positron Storage RingsReceived 1 May 1997; published in the issue dated 27 October 1997 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. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.3186
DOI:
10.1103/PhysRevLett.79.3186
PACS:
29.27.Bd, 29.20.Dh
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