A5082625092- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Distributed and Parallel Computing Systems
- High-Energy Particle Collisions Research
- Fusion materials and technologies
- Electron and X-Ray Spectroscopy Techniques
- Advanced Data Storage Technologies
- Gyrotron and Vacuum Electronics Research
- Engineering Applied Research
- Photocathodes and Microchannel Plates
- Magnetic confinement fusion research
- Electrostatic Discharge in Electronics
- Electromagnetic Simulation and Numerical Methods
- Advancements in Semiconductor Devices and Circuit Design
- Optical Coatings and Gratings
- Scientific Computing and Data Management
- Vacuum and Plasma Arcs
- Electromagnetic Scattering and Analysis
- Diamond and Carbon-based Materials Research
- Advancements in Photolithography Techniques
- Pulsed Power Technology Applications
- Plasma Diagnostics and Applications
European Organization for Nuclear Research
2015-2024
Technical University of Darmstadt
2018
University of Naples Federico II
2011-2012
University of Bologna
1991
The secondary electron yield for low primary-electron energies is shown to strongly depend on the exact surface conditions, with significant implications threshold of electron-cloud build up in proton storage rings.
Beam instabilities cover a wide range of effects in particle accelerators and they have been the subjects intense research for several decades. As machines performance was pushed new mechanisms were revealed nowadays challenge consists studying interplays between all these intricate phenomena, as it is very often not possible to treat different separately. The aim this paper review main mechanisms, discussing particular recent developments beam instability theories simulations.
Numerical formulations based on surface integral equations (SIEs) provide an accurate and efficient framework for the solution of electromagnetic scattering problem by three-dimensional plasmonic nanostructures in frequency domain. In this paper, we present a unified description SIE with both singular nonsingular kernel study their accuracy solving metallic nanoparticles spherical nonspherical shape. fact, numerical solution, especially near zone, is great importance analysis design...
The Large Hadron Collider (LHC) is one of the largest scientific instruments ever built. Since opening up a new energy frontier for exploration in 2010, it has gathered global user community working fundamental particle physics and hadronic matter at extreme temperature density. To sustain extend its discovery potential, LHC will undergo major upgrade 2020s. This increase rate collisions by factor five beyond original design value integrated luminosity ten. configuration, known as High...
Xsuite is a newly developed modular simulation package combining in single flexible and modern framework the capabilities of different tools at CERN past decades, notably Sixtrack, Sixtracklib, COMBI PyHEADTAIL. The suite consists set Python modules (Xobjects, Xpart, Xtrack, Xcoll, Xfields, Xdeps) that can be flexibly combined together with other accelerator-specific general-purpose python to study complex scenarios. code allows for symplectic modeling particle dynamics, effect synchrotron...
Abstract A new scenario for the first operational run of High Luminoisty LHC (HL–LHC) era (Run 4) has recently been developed to accommodate a period performance ramp-up achieve an annual integrated luminosity close nominal HL–LHC design target. The in terms beam parameters and machine settings, as well different phases reach optimal performance, are described here along with impact potential delays key hardware components.
Abstract Beam-induced heat loads on the cryogenic regions of Large Hadron Collider (LHC) exhibit a wide and unexpected dispersion along accelerator, with potential impact performance its High-Luminosity upgrade. Studies related load source to avalanche multiplication electrons at surface beam vacuum chamber, phenomenon known as electron could build-up. Here, we demonstrate that topmost copper pipes extracted from low region LHC consists native Cu 2 O, while pipe high had been oxidized CuO...
Abstract Electron cloud effects are among the main performance limitations for operation of Large Hadron Collider with 25 ns bunch spacing. Electrons impacting on beam screens superconducting magnets induce a significant heat load reaching values close to full cooling capacity available from cryogenic system in some LHC sectors. To better understand this limitation, numerical simulations PyECLOUD code were performed study dependence different and machine parameters, particular population,...
At the beginning of 2016 run, an anomalous beam instability was systematically observed at CERN Large Hadron Collider (LHC). Its main characteristic that it spontaneously appeared after beams had been stored for several hours in collision 6.5 TeV to provide data experiments, despite large chromaticity values and high strength Landau-damping octupole magnet. The exhibited features those induced by electron cloud (EC). Indeed, when LHC operates with 25 ns bunch spacing, EC builds up a fraction...
The performance of 25ns beams in the LHC is strongly limited by electron cloud. To determine amount cloud cold sections machine, it very important to be able disentangle beam induced heating due coupling impedance from that attributable This paper will focus on calculation first contribution. First, model used for power loss briefly discussed. Then, methods regions with one or two are also described. Finally, calculated compared measured heat loads both 25 and 50ns arcs inner triplets (ITs).
Electron cloud buildup simulations and machine experience during Run 1 showed that electron effects could significantly limit the performance of LHC when operating with 25 ns bunch spacing. Beam induced scrubbing will have to be used lower Secondary Yield (SEY) beam chambers therefore reduce pressure rises, heat load degradation. This contribution reviews accumulated on define a possible strategy allow operation beams in 2015. Several measures taken LS1 should for an improved efficiency...
SixTrack is a single-particle tracking code for high-energy circular accelerators routinely used at CERN the Large Hadron Collider (LHC), its luminosity upgrade (HL-LHC), Future Circular (FCC) and Super Proton Synchrotron (SPS) simulations. The based on 6D symplectic engine, which optimized long-term simulations delivers fully reproducible results several platforms. It also includes multiple scattering engines beam–matter interaction studies, as well facilities to run integrated with...
We present a linearized method to study transverse instabilities due electron clouds. It is based on an accurate and compact characterization of the cloud dipolar quadrupolar forces, that can be easily obtained from quick single-pass numerical simulations. The long-term stability properties bunch are then predicted by solving Vlasov equation, taking into account forces introduced e-cloud along as well betatron tune modulation with longitudinal coordinate forces. benchmarked against...