Speaker
Description
Roughly 2500 bunches are accelerated to collision energy during physics production in the Large Hadron Collider (LHC). Due to the beam production scheme in the injector chain, a certain spread in bunch length and intensity at injection into the LHC is unavoidable. The variation in these parameters has implications for RF capture, leakage of particles from the buckets at flat-bottom, and therefore the losses at the start of acceleration. Moreover, bunches with particularly high intensity or short length can become unstable. With the doubling of the nominal bunch charge for the High-Luminosity (HL) LHC era, these variations will become increasingly important. Beam tests have been carried out over the past few years in the LHC with beam intensities up to the HL baseline. Based on data from these studies, projections of longitudinal parameter spreads can be made for the HL-LHC era. In this contribution, the parameters of the beams injected into the LHC are examined in detail. The results are combined with semi-analytic models of debunching at flat-bottom to estimate the spreads for HL-LHC scenarios.
Funding Agency
Research supported by the HL-LHC project.
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