A5069818316- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Nuclear physics research studies
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Carbon Nanotubes in Composites
- Electron and X-Ray Spectroscopy Techniques
- Astronomical and nuclear sciences
- Solar and Space Plasma Dynamics
- Magnetic confinement fusion research
- Graphene research and applications
- X-ray Spectroscopy and Fluorescence Analysis
- Microwave Engineering and Waveguides
- Ion-surface interactions and analysis
- Muon and positron interactions and applications
- Fusion materials and technologies
- Material Properties and Failure Mechanisms
- Electronic Packaging and Soldering Technologies
- Aerosol Filtration and Electrostatic Precipitation
- Aquatic and Environmental Studies
- Thermal Analysis in Power Transmission
European Organization for Nuclear Research
2018-2024
Petersburg State Transport University
2024
All-Russian Scientific Research Institute of Technical Physics
2017-2023
Petersburg Nuclear Physics Institute
2020
Moscow Polytechnic University
2015-2018
Technical University of Darmstadt
2016
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...
Abstract The FCC-ee machines present a huge challenge for the RF systems, which need to be adapted very diverse beam conditions going from moderate energy and high current Z machine low ttbar. This inverse scaling results naturally fixed budget synchrotron radiation, SRF cavities compensate. A global solution was elaborated FCC Conceptual Design Report (Abada in Eur Phys J Spec Top 228):261–623, 2019), is referred here as baseline. Recently, further studies have led new optimized baseline,...
The Landau damping mechanism plays a crucial role in providing single-bunch stability the LHC, high-luminosity and other existing as well previous future circular hadron accelerators. In this paper, thresholds for loss of (LLD) longitudinal plane are derived analytically using Lebedev matrix equation (1968) concept emerged van Kampen modes (1983). We have found that commonly used particle distribution functions from binomial family, LLD threshold vanishes presence constant inductive...
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...
Beam stability is a crucial requirement for all particle accelerators. Coupled-bunch instability (CBI) driven by beam interaction with narrowband impedance of the resonant accelerator components. Loss Landau damping (LLD) single bunch mainly determined broadband and can lead to undamped oscillations. For first time, we solve numerically longitudinal problem in self-consistent way general case two types propose simple analytical criterion describing how obtained LLD CBI thresholds are...
In this paper, we study single-bunch instabilities observed in the CERN Super Proton Synchrotron (SPS). According to linearized Vlasov theory, radial or azimuthal mode-coupling result from a coupling of bunch-oscillation modes, which belong either same adjacent respectively. We show that both instability mechanisms exist SPS by applying Oide-Yokoya approach compute van Kampen modes for realistic longitudinal impedance model SPS. The results agree with macroparticle simulations and are...
The transverse decoherence of injected bunches is an important phenomenon in synchrotrons and storage rings. initial stage this process determines the emittance blowup, which should be taken into account for design feedback systems, example. interplay different high-intensity effects can strongly affect stage. We present a model that explains growth with chromaticity, space charge, image charges within first synchrotron period. compare combinations parameters self-consistent particle...
The high order mode (HOM) power losses induced by a particle beam in accelerator components should be taken into account during their design and the choice of HOM couplers. In this work due to HOMs proposed 400.79 MHz radio frequency (rf) cavity designs were evaluated for various energy options (Z, W, H, $\mathrm{t}\overline{\mathrm{t}}$) future circular electron-positron collider (FCC-ee). constraints rf are dictated Z machine with lowest energy, but highest current. Still certain filling...
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...
Abstract As the study of Future Circular Collider (FCC) project progresses, choice exact circumference accelerator tunnel becomes essential. It is defined by RF-related constraints, mainly RF frequency FCC-hh, as well revolution ratios with hadron injector. shown firstly how favourable options assuming present LHC have been identified and ranked from point view. Secondly, entire range interest has systematically scanned, possibility operating SPS or potential injector FCC-hh. Considerations...
Objective: the article presents an assessment of intensity accumulation residual deformations main platform roadbed in areas circulation heavy and long-composite trains formed from wagons with axial load up to 25 tons. Methods: measurements site were carried out by geodetic methods laying a closed leveling course. To do this, each experimental was equipped soil stamps installed on reference points. The 30.05.2022 08.11.2023. Results: as result, dependences missed tonnage have been...
Abstract At injection into the Large Hadron Collider (LHC), radio frequency (RF) system is perturbed by beam-induced voltage resulting in strong RF power transients and instant detuning of cavities. The automatic tuning system, however, needs time for mechanical compensation resonance to take place. Acting back on beam, are expected limit maximum injected intensity generating unacceptable beam loss. Reducing them therefore essential reach target during High Luminosity (HL) LHC era. flat...
Interaction of the beam with fundamental impedance accelerating cavities can limit performance high-current accelerators. It result in a significant variation bunch-by-bunch parameters (bunch length, synchronous phase, etc.) if filling patterns contain gaps that are not negligible compared cavity time. In present work, this limitation is analyzed using steady-state time-domain approach for option (Z) future circular electron-positron collider and hadron-hadron collider. Mitigation transient...
To accumulate experimental data for theoretical investigation of threshold phenomena in nuclear reactions the excitation function 11B(t, p)13B reaction has been measured triton energy range Et=2.6-4.2 MeV which includes n)13C*(15.108 MeV, Jπ=3/2', T=3/2) at Et=3.42 MeV. With that purpose boron layer (375 µgcm-2 thick and enriched to 92% 11B) on tantalum backing (0.2 mm thick) were bombarded with tritons electrostatic tandem accelerator. Using pulsed mode target irradiation delayed 3.681...