Beam–Beam Effects

Shiltsev, Vladimir; Valishev, Alexander

doi:10.1007/978-1-4939-0885-1_8

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Beam-beam Effects1

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2018

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“…This leads to a different net kick on these bunches, and hence, to bunch-to-bunch differences in orbit, tunes, and chromaticities. These so-called "PACMAN" effects have been predicted first in design studies of the SSC [5, 6], and have since been observed in the Tevatron [7] and in the LHC [4, [8][9][10]. Also, due to the asymmetric position of the ALICE and LHCb experiments in the LHC, some bunches do not collide at all in these IPs ("SuperPACMAN" bunches).…”

Section: Beam-beam Effectsmentioning

confidence: 99%

Luminosity scans for beam diagnostics

Hostettler

Fuchsberger

Papotti

et al. 2018

Phys. Rev. Accel. Beams

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A new type of fast luminosity separation scans ("Emittance Scans") was introduced at the CERN Large Hadron Collider (LHC) in 2015. The scans were performed systematically in every fill with full-intensity beams in physics production conditions at the Interaction Point (IP) of the Compact Muon Solenoid (CMS) experiment. They provide both transverse emittance and closed orbit measurements at a bunch-by-bunch level. The precise measurement of beam-beam closed orbit differences allowed a direct, quantitative observation of long-range beam-beam PACMAN effects, which agrees well with numerical simulations from an improved version of the TRAIN code. II. BUNCH-BY-BUNCH DIAGNOSTICS AT THE LHC A. Luminosity MeasurementsIn the following, the main observable used for the analysis of Emittance Scans is the bunch-by-bunch luminosity as

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Section: Beam-beam Effectsmentioning

confidence: 99%