Abstract
Several configurations of the High Luminosity Large Hadron Collider, whose performance at collision is mainly limited due to the strong beam-beam long-range interactions, are studied in the presence of dc wire compensators. This analysis is based on analytical and numerical calculations where the main observables are the dynamic aperture (correlated to the beam lifetime) and the frequency map analysis. It is demonstrated that, with a proper optimization of the wire compensator parameters (distance from the beam and wire current) and without violating the machine protection restrictions, these long range beam-beam interactions can be very well mitigated, making these scenarios viable and complementary with respect to the present HL-LHC baseline. The impact in the integrated luminosity and the operational flexibility gained are also presented.
Highlights
AND MOTIVATIONThe counter rotating proton beams in the Large Hadron Collider (LHC) [1] share the same beam pipe at the insertion regions (IR), where the experiments are located
The use of wire compensators was initially proposed in an LHC note [13] and after the previously mentioned positive experimental results four wire demonstrators were installed at each high luminosity interaction points (IPs) of the LHC (IP1 and IP5)
Simulating the HL-LHC nominal scenario, the most severe degradation of the dynamic aperture (DA) and of the beam lifetime [27] from the beambeam long range (BBLR) kicks can be observed at the end of the luminosity leveling where the optical beta at the IPs is minimum
Summary
Several configurations of the High Luminosity Large Hadron Collider, whose performance at collision is mainly limited due to the strong beam-beam long-range interactions, are studied in the presence of dc wire compensators. This analysis is based on analytical and numerical calculations where the main observables are the dynamic aperture (correlated to the beam lifetime) and the frequency map analysis. With a proper optimization of the wire compensator parameters (distance from the beam and wire current) and without violating the machine protection restrictions, these long range beambeam interactions can be very well mitigated, making these scenarios viable and complementary with respect to the present HL-LHC baseline. The impact in the integrated luminosity and the operational flexibility gained are presented
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