Hannes Bartosik
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View article: Demonstrating Beam Splitting Through Stable Islands Formed by the Third-Order Resonance at the CERN Super Proton Synchrotron
Demonstrating Beam Splitting Through Stable Islands Formed by the Third-Order Resonance at the CERN Super Proton Synchrotron Open
In recent years, several new beam manipulation techniques have been proposed that exploit the crossing of non-linear resonances and the use of stable islands of the transverse phase space. One such manipulation is a novel approach to slow …
View article: Impact of beam coupling impedance on crab cavity noise induced emittance growth
Impact of beam coupling impedance on crab cavity noise induced emittance growth Open
Crab cavities will be deployed as a part of the High Luminosity Large Hadron Collider (HL-LHC) upgrade to mitigate the luminosity reduction induced by the crossing angle at the main experiments (ATLAS and CMS). Two prototype crab cavities …
View article: Interplay of space charge, intrabeam scattering, and synchrotron radiation in the Compact Linear Collider damping rings
Interplay of space charge, intrabeam scattering, and synchrotron radiation in the Compact Linear Collider damping rings Open
Future ultralow emittance rings for e−/e+ colliders require extremely high beam brightness and can thus be limited by collective effects. In this paper, the interplay of effects such as synchrotron radiation, intrabeam scattering (IBS), an…
View article: Selected advances in the accelerator design of the Future Circular Electron-Positron Collider (FCC-ee)
Selected advances in the accelerator design of the Future Circular Electron-Positron Collider (FCC-ee) Open
In autumn 2023, the FCC Feasibility Study underwent a crucial “mid-term review”. We describe some accelerator performance risks for the proposed future circular electron- positron collider, FCC-ee, identified for, and during, the mid-term …
View article: Observation of fixed lines induced by a nonlinear resonance in the CERN Super Proton Synchrotron
Observation of fixed lines induced by a nonlinear resonance in the CERN Super Proton Synchrotron Open
The motion of systems with linear restoring forces and recurring nonlinear perturbations is of central importance in physics. When a system’s natural oscillation frequencies and the frequency of the nonlinear restoring forces satisfy certa…
View article: Beam from Injectors: The LHC Injectors Upgrade (LIU) Project
Beam from Injectors: The LHC Injectors Upgrade (LIU) Project Open
The LHC Injectors Upgrade (LIU) project aims at increasing the intensity and brightness in the LHC injectors in order to match the challenging requirements of the High-Luminosity LHC (HL-LHC) project, while ensuring high availability and r…
View article: First results of running the LHC with lead ions at a beam energy of 6.8 Z TeV
First results of running the LHC with lead ions at a beam energy of 6.8 Z TeV Open
A two-day test of operation with Pb ion beams was carried out in the CERN Large Hadron Collider (LHC) in 2022, with the aim of gaining experience in view of the future high luminosity heavy-ion physics runs from 2023 onwards. The LHC exper…
View article: Tailoring transverse beam characteristics with the new CERN PS Booster charge-exchange injection system
Tailoring transverse beam characteristics with the new CERN PS Booster charge-exchange injection system Open
A key aspect of the LHC Injectors Upgrade project is the connection of the PSB to the newly built Linac4 and the related installation of a new 160 MeV charge-exchange injection system. The new injection system was commissioned in winter 20…
View article: Post-LS3 Experimental Options in ECN3
Post-LS3 Experimental Options in ECN3 Open
The Experimental Cavern North 3 (ECN3) is an underground experimental cavern on the CERN Prévessin site. ECN3 currently hosts the NA62 experiment, with a physics programme devoted to rare kaon decays and searches of hidden particles approv…
View article: Interplay of space charge and intrabeam scattering in the LHC ion injector chain
Interplay of space charge and intrabeam scattering in the LHC ion injector chain Open
The ion injectors of the CERN accelerator chain, in particular the Super Proton Synchrotron (SPS) and the Low Energy Ion Ring (LEIR), operate in a strong space charge~(SC) and intrabeam scattering (IBS) regime, which can degrade beam quali…
View article: SPS fixed line experiment - experimental data
SPS fixed line experiment - experimental data Open
Experimental turn-by-turn beam position monitor (BPM) data of an example shot of a kicked beam in the CERN Super Proton Synchrotron from 2018. The set contains data from 4 consecutive BPMs (vertical-horizontal-vertical-horizontal) with abo…
View article: SPS fixed line experiment - experimental data
SPS fixed line experiment - experimental data Open
Experimental turn-by-turn beam position monitor (BPM) data of an example shot of a kicked beam in the CERN Super Proton Synchrotron from 2018. The set contains data from 4 consecutive BPMs (vertical-horizontal-vertical-horizontal) with abo…
View article: Interplay of space charge, intrabeam scattering and synchrotron radiation in the Compact Linear Collider damping rings
Interplay of space charge, intrabeam scattering and synchrotron radiation in the Compact Linear Collider damping rings Open
Future ultra-low emittance rings for electron/positron colliders require extremely high beam brightness and can thus be limited by collective effects. In this paper, the interplay of effects such as synchrotron radiation, intra-beam scatte…
View article: Long term stability studies in the presence of crab cavities and high order multipoles in the CERN super proton synchrotron and high luminosity large hadron collider
Long term stability studies in the presence of crab cavities and high order multipoles in the CERN super proton synchrotron and high luminosity large hadron collider Open
In 2018 the world’s first Crab Cavity (CC) experiments with protons were successfully performed, aiming to study the CC effect on a proton beam and evaluate the engineering challenges. Before the commencement of these experiments, the impa…
View article: Experimental observation of fixed lines in a particle accelerator
Experimental observation of fixed lines in a particle accelerator Open
The motion of systems with linear restoring forces and recurring nonlinear perturbations is of central importance in physics: when a system's natural oscillation frequencies and the frequency of the nonlinear restoring forces satisfy certa…
View article: Performance of the LHC injector chain after the upgrade and potential development
Performance of the LHC injector chain after the upgrade and potential development Open
The CERN accelerator complex prepares protons for the four big experiments at the Interaction Regions of the Large Hadron Collider (LHC) as well as for a number of fixed target experiments, which take beam directly from the LHC injectors. …
View article: SPS Beam Steering for LHC Extraction
SPS Beam Steering for LHC Extraction Open
The CERN Super Proton Synchrotron accelerates beams for the Large Hadron Collider to 450 GeV. In addition it produces beams for fixed target facilities which adds complexity to the SPS operation. During the run 2012-2013 drifts of the extr…
View article: Understanding of the CERN-SPS Horizontal Instability with Multiple Bunches
Understanding of the CERN-SPS Horizontal Instability with Multiple Bunches Open
At the end of 2018, an instability with multiple bunches has been consistently observed during high intensity studies at the CERN-SPS. This instability could be a significant limitation to achieve the bunch intensity expected after the LHC…
View article: First demonstration of the use of crab cavities on hadron beams
First demonstration of the use of crab cavities on hadron beams Open
Many future particle colliders require beam crabbing to recover geometric luminosity loss from the nonzero crossing angle at the interaction point (IP). A first demonstration experiment of crabbing with hadron beams was successfully carrie…
View article: Source of horizontal instability at the CERN Proton Synchrotron Booster
Source of horizontal instability at the CERN Proton Synchrotron Booster Open
The CERN Proton Synchrotron Booster (PSB) has been known to suffer from horizontal instabilities since its early operation. These instabilities appear at specific beam energies and range of working points. The source of the instability and…
View article: Mitigation of collective effects by optics optimisation
Mitigation of collective effects by optics optimisation Open
This paper covers recent progress in the design of optics solutions to minimize collective effects such as beam instabilities, intra-beam scattering or space charge in hadron and lepton rings. The necessary steps are reviewed for designing…
View article: Beam Commissioning of the New 160 MeV H⁻ Injection System of the CERN PS Booster
Beam Commissioning of the New 160 MeV H⁻ Injection System of the CERN PS Booster Open
A key component to meeting the brightness targets of the LHC Injectors Upgrade (LIU) project at CERN is the new 160 MeV H⁻ charge exchange injection system into the Proton Synchrotron Booster. This system has been in beam commissioning sin…
View article: Studies for an LHC Pilot Run with Oxygen Beams
Studies for an LHC Pilot Run with Oxygen Beams Open
Motivated by the study of collective effects in small systems with oxygen-oxygen (O-O) collisions, and improvements to the understanding of high-energy cosmic ray interactions from proton-oxygen (p-O) collisions, a short LHC oxygen run dur…
View article: Optics Measurement by Excitation of Betatron Oscillations in the CERN PSB
Optics Measurement by Excitation of Betatron Oscillations in the CERN PSB Open
Optics measurement from analysis of turn-by-turn BPM data of betatron oscillations excited with a kicker magnet has been employed very successfully in many machines but faces particular challenges in the CERN PSB where BPM to BPM phase adv…
View article: Investigation of Damping Effects of the Crab Cavity Noise Induced Emittance Growth
Investigation of Damping Effects of the Crab Cavity Noise Induced Emittance Growth Open
Crab cavities will be installed at the two main interaction points (IP1 and IP5) of the High Luminosity LHC (HL-LHC) in order to minimize the geometric reduction of the luminosity due to the crossing angle. Two prototype crab cavities have…
View article: Interplay Between Space Charge, Intra-Beam Scattering, and Synchrotron Radiation Effects
Interplay Between Space Charge, Intra-Beam Scattering, and Synchrotron Radiation Effects Open
The objective of this research is to study the interplay of synchrotron radiation, intra-beam scattering, and space charge in the vicinity of excited resonances. In this respect, two modules were developed to simulate intra-beam scattering…
View article: Optimising and Extending a Single-Particle Tracking Library for High Parallel Performance
Optimising and Extending a Single-Particle Tracking Library for High Parallel Performance Open
SixTrackLib is a library for performing beam-dynamics simulations on highly parallel computing devices such as shared memory multi-core processors or graphical processing units (GPUs). Its single-particle approach fits very well with paral…
View article: A Framework for Dynamic Aperture Studies for Colliding Beams in the High-Luminosity Large Hadron Collider
A Framework for Dynamic Aperture Studies for Colliding Beams in the High-Luminosity Large Hadron Collider Open
During the last physics run of the Large Hadron Collider (LHC), Dynamic Aperture (DA) studies have been successfully employed to optimize the accelerator’s performance by guiding the selection of the beam and machine parameters. In this pa…
View article: New Longitudinal Beam Production Methods in the CERN Proton Synchrotron Booster
New Longitudinal Beam Production Methods in the CERN Proton Synchrotron Booster Open
As part of the LHC Injectors Upgrade (LIU) project, significant improvements were made to the CERN Proton Synchrotron Booster (PSB) during the 2019/2020 long shutdown, including a new Finemet-based wideband RF system, renovated longitudina…
View article: CERN Yellow Reports: Monographs, Vol. 10 (2020): High-Luminosity Large Hadron Collider (HL-LHC): Technical design report
CERN Yellow Reports: Monographs, Vol. 10 (2020): High-Luminosity Large Hadron Collider (HL-LHC): Technical design report Open
The Large Hadron Collider (LHC) is one of the largest scientific instruments ever built. Since opening up anew energy frontier for exploration in 2010, it has gathered a global user community of about 9000 scientists working in fundamental…