Simulations of long range beam-beam effects in CESR in a strong-strong scenario

The Long Range Beam-Beam Interaction (LRBBI) is one of major limiting factor to the performance of a pretzel collider machine like CESR in which each bunch has several tens parasitic crossing points along the ring. To investigate the effects due to LRBBI, simulation studies are done with new simulation code in weak-strong and strong-strong scenarios. The precise simulations reveal that LRBBI, in the case of CESR, has significant effects on machine parameters. Especially the bunch-by-bunch differences, which can hardly be compensated by routine adjustments of operation conditions, may affect the luminosity performance directly. In future, with possibly higher current, more bunches or higher current/energy ratio, the dedicated compensation schemes are necessary