Momentum Slip-Stacking in CERN SPS for the Ion Beams

Argyropoulos, Theodoros; Bohl, Thomas; Lasheen, Alexandre; Papotti, Giulia; Quartullo, Danilo; Shaposhnikova, E.

doi:10.18429/jacow-ipac2019-wepts039

Cited by 3 publications

(1 citation statement)

References 1 publication

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“…beam power are the lifting of the limit on peak luminosity in the ALICE experiment from the current L = 1 × 10 27 cm −2 s −1 to about L = 7 × 10 27 cm −2 s −1 [19], and the RF upgrade in the Super Proton Synchrotron (SPS) that will reduce the bunch spacing to 50 ns [20,21] allowing for a higher circulating beam intensity and increased potential peak luminosity in all experiments.…”

Section: Introductionmentioning

confidence: 99%

Bound-free pair production from nuclear collisions and the steady-state quench limit of the main dipole magnets of the CERN Large Hadron Collider

Schaumann,

Jowett,

Castro

et al. 2020

Preprint

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During its Run 2 (2015)(2016)(2017)(2018), the Large Hadron Collider (LHC) operated at almost twice higher energy, and provided Pb-Pb collisions with an order of magnitude higher luminosity, than in the previous Run 1. In consequence, the power of the secondary beams emitted from the interaction points by the bound-free pair production (BFPP) process increased by a factor ∼ 20, while the propensity of the bending magnets to quench increased with the higher magnetic field. This beam power is about 35 times greater than that contained in the luminosity debris from hadronic interactions and is focused on specific locations that fall naturally inside superconducting magnets. The risk of quenching these magnets has long been recognized as severe and there are operational limitations due to the dynamic heat load that must be evacuated by the cryogenic system.High-luminosity operation was nevertheless possible thanks to orbit bumps that were introduced in the dispersion suppressors around the ATLAS and CMS experiments to prevent quenches by displacing and spreading out these beam losses. Further, in 2015, the BFPP beams were manipulated to induce a controlled quench, thus providing the first direct measurement of the steady-state quench level of an LHC dipole magnet. The same experiment demonstrated the need for new collimators that are being installed around the ALICE experiment to intercept the secondary beams in the future. This paper discusses the experience with BFPP at luminosities very close to the future High Luminosity LHC (HL-LHC) target, gives results on the risk reduction by orbit bumps and presents a detailed analysis of the controlled quench experiment.

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Section: Introductionmentioning

confidence: 99%

Bound-free pair production from nuclear collisions and the steady-state quench limit of the main dipole magnets of the CERN Large Hadron Collider

Schaumann,

Jowett,

Castro

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

Beam longitudinal dynamics simulation studies

Timko,

Albright,

Argyropoulos

et al. 2023

Phys. Rev. Accel. Beams

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Development of a Real-Time Magnetic Field Measurement System for Synchrotron Control

et al. 2021

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The precise knowledge of the magnetic field produced by dipole magnets is critical to the operation of a synchrotron. Real-time measurement systems may be required, especially in the case of iron-dominated electromagnets with strong non-linear effects, to acquire the magnetic field and feed it back to various users. This work concerns the design and implementation of a new measurement system of this kind currently being deployed throughout the European Organization for Nuclear Research (CERN) accelerator complex. We first discuss the measurement principle, the general system architecture and the technology employed, focusing in particular on the most critical and specialized components developed, that is, the field marker trigger generator and the magnetic flux integrator. We then present the results of a detailed metrological characterization of the integrator, including the aspects of drift estimation and correction, as well as the absolute gain calibration and frequency response. We finally discuss the latency of the whole acquisition chain and present an outline of future work to improve the capabilities of the system.

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Momentum Slip-Stacking in CERN SPS for the Ion Beams

Cited by 3 publications

References 1 publication

Bound-free pair production from nuclear collisions and the steady-state quench limit of the main dipole magnets of the CERN Large Hadron Collider

Bound-free pair production from nuclear collisions and the steady-state quench limit of the main dipole magnets of the CERN Large Hadron Collider

Beam longitudinal dynamics simulation studies

Development of a Real-Time Magnetic Field Measurement System for Synchrotron Control

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