A5047403423- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Electron Spin Resonance Studies
- Gyrotron and Vacuum Electronics Research
- Quantum chaos and dynamical systems
- Quantum optics and atomic interactions
Sapienza University of Rome
2024
European Organization for Nuclear Research
2023-2024
National Technical University of Athens
2021
Landau damping is a natural stabilization mechanism that mitigates coherent beam instabilities. In the longitudinal plane, loss of damping~(LLD) occurs when mode oscillation emerges from incoherent band bunch synchrotron frequencies. This work extends recent LLD studies to relevant case double-harmonic rf systems. Specifically, it shown in shortening (both systems phase at position for non-accelerating bucket), inductive impedance above transition energy results vanishing threshold binominal...
The beam longitudinal dynamics code blond, utilized tool, has been developed at CERN since 2014. It emerged as a central tool for conducting simulations. In this paper, we present modular simulation suite and the various physics models that can be included combined by user. We detail reference frame, equations of motion, plethora options radio-frequency parameters such phase noise, fixed-field acceleration, feedback accelerators, well modeling collective effects synchrotron radiation. also...
Abstract Landau damping represents the most efficient stabilization mechanism in hadron synchrotron accelerators to mitigate coherent beam instabilities. Recent studies allowed expanding novel analytical criteria of loss (LLD) double harmonic RF system case above transition energy, providing an estimate longitudinal stability. The threshold has a strong dependence on voltage ratio between and main systems. Based that, measurements single bunch oscillations after rigid-dipole perturbation...
Harmonics of the mains frequency (50 Hz) have been systematically observed in transverse beam spectrum Large Hadron Collider (LHC) since start its operation form dipolar excitations. In presence strong non-linearities such as beam-beam interactions, many these power supply ripple tones reside vicinity betatron tune they can increase diffusion particles distribution, leading to proton losses and eventually a significant reduction lifetime. The aim this paper is determine whether 50~Hz...
Since the beginning of Large Hadron Collider (LHC) commissioning, spectral components at harmonics mains frequency (50 Hz) have been observed in transverse beam spectrum. This paper presents an overview most important observations, collected during latest physics operation LHC 2018, which clearly indicates that are result a real excitation rather than instrumental feature. Based on these findings, potential sources perturbation discussed and correlation with power supply ripple originating...