К. В. Лотов
A5063783442- Laser-Plasma Interactions and Diagnostics
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- High-pressure geophysics and materials
- Pulsed Power Technology Applications
- Atomic and Molecular Physics
- Dust and Plasma Wave Phenomena
- Plasma Diagnostics and Applications
- Particle physics theoretical and experimental studies
- Gyrotron and Vacuum Electronics Research
- Particle Detector Development and Performance
- Fluid Dynamics and Turbulent Flows
- Radiation Therapy and Dosimetry
- Laser Material Processing Techniques
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Plasma and Flow Control in Aerodynamics
- Fusion and Plasma Physics Studies
- Fusion materials and technologies
- Fluid Dynamics and Thin Films
Budker Institute of Nuclear Physics
2016-2025
Novosibirsk State University
2016-2025
Siberian Branch of the Russian Academy of Sciences
2014-2024
European Organization for Nuclear Research
2023
Campbell Collaboration
2020-2022
Google (United States)
2019
Max Planck Institute for Plasma Physics - Greifswald
2016
Heinrich Heine University Düsseldorf
2010
University of California, Los Angeles
2010
Max Planck Society
2010
High energy particle accelerators have been crucial in providing a deeper understanding of fundamental particles and the forces that govern their interactions. In order to increase or reduce size accelerator, new acceleration schemes need be developed. Plasma wakefield acceleration, which electrons plasma are excited, leading strong electric fields, is one such promising novel technique. Pioneering experiments shown an intense laser pulse electron bunch traversing plasma, drives fields 10s...
An analytical model for the self-modulation instability of a long relativistic proton bunch propagating in uniform plasmas is developed. The self-modulated resonantly excites large amplitude plasma wave (wakefield), which can be used acceleration electrons. Analytical expressions linear growth rates and number exponentiations are given. We use full three-dimensional particle-in-cell (PIC) simulations to study beam transition nonlinear stage. It shown that competes with hosing tends destroy...
The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wakefield generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment CERN the world׳s first experiment. AWAKE will be installed in former CNGS facility uses 400 GeV/c beam bunches from SPS. experiments focus on self-modulation instability of long (rms ~12 cm) bunch plasma. These are planned for end 2016. Later, 2017/2018, low energy (~15 MeV)...
New acceleration technology is mandatory for the future elucidation of fundamental particles and their interactions. A promising approach to exploit properties plasmas. Past research has focused on creating large-amplitude plasma waves by injecting an intense laser pulse or electron bunch into plasma. However, maximum energy gain electrons accelerated in a single stage limited driver. Proton bunches are most drivers wakefields accelerate TeV scale stage. An experimental program at CERN—the...
It is demonstrated that the performance of self-modulated proton driver plasma wakefield accelerator (SM-PDPWA) strongly affected by reduced phase velocity wave. Using analytical theory and particle-in-cell simulations, we show reduction largest during linear stage self-modulation. As instability nonlinearly saturates, approaches driver. The deleterious effects wake's dynamics on maximum energy gain accelerated electrons can be avoided using side-injections electrons, or controlling smooth...
We give direct experimental evidence for the observation of full transverse self-modulation a long, relativistic proton bunch propagating through dense plasma. The exits plasma with periodic density modulation resulting from radial wakefield effects. show that is seeded by ionization front created using an intense laser pulse copropagating bunch. extends over length following seed point. By varying one order magnitude, we frequency scales expected dependence on density, i.e., it equal to...
The seeded self-modulation of a relativistic, charged particle bunch in plasma is shown to grow both along the and plasma, resulting transverse wakefield amplitudes that far exceed initial seed values.
We show in experiments that a long, underdense, relativistic proton bunch propagating plasma undergoes the oblique instability, which we observe as filamentation. determine threshold value for ratio between transverse size and skin depth instability to occur. At threshold, outcome of experiment alternates filamentation self-modulation (evidenced by longitudinal modulation into microbunches). Time-resolved images density distribution reveal grows an observable level late along bunch,...
In a plasma wakefield accelerator driven by train of short particle bunches, it is possible to locally increase the acceleration rate slightly decreasing density and introducing its small negative gradient. There regime in which changing affects only relative phasing driver bunches wave, keeping wave phase behind stable. With this technique, energy gain accelerated witness bunch section limited length.
AWAKE is a proton-driven plasma wakefield acceleration experiment. % We show that the experimental setup briefly described here ready for systematic study of seeded self-modulation 400\,GeV proton bunch in 10\,m-long rubidium with density adjustable from 1 to 10$\times10^{14}$\,cm$^{-3}$. short laser pulse used ionization vapor propagates all way along column, suggesting full vapor. occurs bunch, at time and follows affects bunch.
Plasma wakefield acceleration is a promising technology to reduce the size of particle accelerators. The use high energy protons drive wakefields in plasma has been demonstrated during Run 1 AWAKE programme at CERN. Protons 400 GeV drove that accelerated electrons 2 under 10 m plasma. collaboration now embarking on with main aims demonstrate stable accelerating gradients 0.5–1 GV/m, preserve emittance electron bunches and develop sources scalable 100s metres beyond. By end 2, scheme should...
Experimental results show that hosing of a long particle bunch in plasma can be induced by wakefields driven short, misaligned preceding bunch. Hosing develops the plane misalignment, self-modulation perpendicular plane, at frequencies close to electron frequency, and are reproducible. Development depends on misalignment direction, its growth extent proton charge. Results have main characteristics theoretical model, relevant other plasma-based accelerators represent first characterization...
A recently developed three-dimensional version of the quasistatic code LCODE has a novel feature that enables high-accuracy simulations long-term evolution waves in plasma wakefield accelerators. Equations particle motion are modified to suppress clustering and numerical heating macroparticles, which otherwise occur because Debye length is not resolved by grid. The previously observed effects premature wake chaotization wavebreaking disappear with equations.
For simulations of plasma wakefield acceleration (PWFA) and similar problems, we developed two-dimensional fully electromagnetic relativistic hybrid code LCODE. The is very fast due to explicit use several simplifying assumptions (quasistatic approximation, ultrarelativistic beam, the symmetry). With LCODE, make high-resolution blowout regime PWFA study temperature effect on amplitude accelerating field spike.
The plasma wakefield amplitudes which could be achieved via the modulation of a long proton bunch are investigated. We find that in limit bunches compared to wavelength, strength accelerating fields is directly proportional number particles drive and inversely square transverse size. scaling laws were tested verified detailed simulations using parameters existing accelerators, large electric achieved, reaching 1 GV/m for LHC bunches. Energy gains test electrons beyond 6 TeV found this case.
A wide region of beam parameters is numerically scanned and the dependence wakefield properties on length current clarified for blowout regime beam-plasma interaction. The main regimes plasma response are found, which qualitatively differ in behavior. To characterize efficiency energy exchange between plasma, flux through comoving window introduced. Scalings linear studied. most efficient transfer occurs so-called "strong beam" For this regime, analytical approximations various aspects obtained.
AbstractRecent results of the experiments at GOL-3 facility are presented. In present configuration device, plasma with a density 1014[divided by]1016 cm-3 is confined in 12-meter-long solenoid, which comprises 55 corrugation cells mirror ratio Bmax/Bmin=4.8/3.2 T. The solenoid heated up to 2-4 keV temperature by high power relativistic electron beam (˜1 MeV, ˜30 kA, ˜8 μs, ˜120 kJ) injected through one ends. Mechanism experimentally observed fast ion heating, issues stability and...
Proton beam driven plasma wakefield acceleration was recently proposed as a way to bring electrons TeV energy range in single section. Here we present detailed numerical analysis of this scheme. We identify the main effects limiting efficiency and ultimate gain, formulate optimum conditions for acceleration.
A high energy particle beam propagating in a uniform plasma is subject to the transverse two-stream instability that first transforms into train of microbunches and then quickly destroys by wakefields. By proper longitudinal inhomogeneity density, it possible stop action at stage form bunch can resonantly excite wakefields over long distance. The latter feature vital for proton driven wakefield acceleration was recently proposed as way bring electrons TeV range single section.
Abstract Nowadays, human's understanding of the fundamental physics is somehow limited by energy that our high accelerators can afford. Up to 4 TeV protons are realized in Large Hadron Collider (LHC). Leptons, such as electrons and positrons, however gained energies about 100 GeV or less. Multi-TeV lepton still lacking due relatively low acceleration gradient conventional methods, which may induce unbearable cost. On other hand, plasmas have shown extraordinary potential accelerating ions,...
The self-modulation instability is a key effect that makes possible the usage of nowadays proton beams as drivers for plasma wakefield acceleration. Development in uniform plasmas and with small density up-step numerically studied focus at nonlinear stages beam evolution. step parameters providing strongest established are found, mechanism stable bunch train formation identified.
A long, narrow, relativistic charged particle bunch propagating in plasma is subject to the self-modulation (SM) instability. We show that SM of a proton can be seeded by wakefields driven preceding electron bunch. timing reproducibility and control are at level small fraction modulation period. With this seeding method, we independently amplitude seed with charge growth rate Seeding leads larger than instability case.