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• W2140871876 abstract "Long-range beam-beam interactions are expected to limit the maximum achievable luminosity in colliders with several thousand high-current bunches. In this report we summarize recent experiments with focus on parasitic collisions in the Tevatron, SPS, LEP, CESR, the Bfactories, and RHIC. Compensation schemes and the relevance of these findings to the LHC will be discussed. Both existing and future colliders call for increasing the number and intensity of bunches to maximize the total luminosity. The counter-rotating bunches must be separated on either side of the interaction points (IPs) and in the collider arcs. However, bunches which are separated by only a few sigma experience long-range beam-beam forces, which may compromise the total number of bunches. Moreover, in accelerators operating with as many as possible bunches, these long-range interactions are expected to eventually limit the achievable bunch intensities and hence the luminosity. Long-range beam-beam interactions introduce various complications beyond those seen with the usual shortrange interactions. These include additional nonlinearities, additional shifts in the bunch tune, and coupling generated between the bunches. Operational difficulties may also arise due to the separation schemes; e.g. large crossing angles, strong separator fields, dispersion generated by the separators, or coupling introduced by the detector solenoids with displaced orbits. Irregularities in the bunch fill pattern give rise to additional concerns. At the LHC, gaps in the fill patterns will be present to avoid beam loss due to the rise and fall times of the injection and abort kickers and possibly for alleviation of ions and/or electron clouds. Such gaps introduce for the different bunches multiple tune footprints which depend on the proximity to the gap(s), different orbits, lifetimes, and luminosities, potential changes in coherent beam-beam modes, and operational concerns due to the differences in bunch properties. In this report we summarize selected observations from existing colliders pertaining to parasitic collisions (PCs). Common features of the observations will be stressed as will those issues pertinent to operation of the LHC, which has a design fill pattern consisting of over 2800 bunches per beam and up to 120 PCs (15 on each side of 4 IPs)." @default.
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• W2140871876 title "RECENT STUDIES OF THE BEAM-BEAM INTERACTION WITH PARASITIC COLLISIONS: EXPERIMENTS" @default.
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