Beam-Beam Instability in Case of Strong-Weak Beam-Beam Interactions.

Beam-beam effects in HERA were studied with a self-consistent beam-beam simulation by using the particle-in-cell method. A remarkable agreement between the experimental measurement and the simulation result was observed on the emittance growth, luminosity reduction, and coherent beam-beam tune shifts. The simulation study also showed that the chaotic coherent beam-beam instability could occur in HERA and this collective beam-beam instability could be avoided with a slightly different tune. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]