A. P. Sosedkin
A5030667367- Laser-Plasma Interactions and Diagnostics
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Solar and Space Plasma Dynamics
- Laser-Matter Interactions and Applications
- Pulsed Power Technology Applications
- Ionosphere and magnetosphere dynamics
- High-pressure geophysics and materials
- Terahertz technology and applications
- Gyrotron and Vacuum Electronics Research
- Ion-surface interactions and analysis
- Particle Dynamics in Fluid Flows
- Gamma-ray bursts and supernovae
- Cold Atom Physics and Bose-Einstein Condensates
- Precipitation Measurement and Analysis
- Particle physics theoretical and experimental studies
- Electromagnetic Compatibility and Measurements
- Radiation Therapy and Dosimetry
- Plasma and Flow Control in Aerodynamics
- Plasma Diagnostics and Applications
Novosibirsk State University
2014-2025
Budker Institute of Nuclear Physics
2014-2025
Siberian Branch of the Russian Academy of Sciences
2014-2019
Google (United States)
2019
Lancaster University
2016
Cockcroft Institute
2016
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...
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...
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.
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.
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.
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,...
It is shown that co-linear injection of electrons or positrons into the wakefield self-modulating particle beam possible and ensures high energy gain. The witness must co-propagate with tail part driver, since plasma wave phase velocity there can exceed light velocity, which necessary for efficient acceleration. If many periods long, then trapped charge limited by loading effects. initial trapping better positrons, but at acceleration stage a considerable fraction lost from wave. For...
Metre-scale plasma wakefield accelerators have imparted energy gain approaching 10 gigaelectronvolts to single nano-Coulomb electron bunches. To reach useful average currents, however, the enormous density that driver deposits into wake must be removed efficiently between shots. Yet mechanisms by which wakes dissipate their surrounding remain poorly understood. Here, we report ps-time-resolved, grazing-angle optical shadowgraphic measurements and large-scale particle-in-cell simulations of...
A novel effect of fast heating and charging a finite-radius plasma is discovered in the context wakefield acceleration. As wave breaks, most its energy transferred to electrons. The electrons gain substantial transverse momentum escape radially, which gives rise strong charge-separation electric field azimuthal magnetic around plasma. slowly varying structure preserved for hundreds periods contains (together with hot electrons) up 80% initial energy.
Presently available high-energy proton beams in circular accelerators carry enough momentum to accelerate high-intensity electron and positron the TeV energy scale over several hundred meters of plasma with a density about 1e15 1/cm^3. However, wavelength at this is 100-1000 times shorter than typical longitudinal size beam. Therefore self-modulation instability (SMI) long (~10 cm) beam should be used create train micro-bunches which would then drive wake resonantly. Changing profile offers...
Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI
In an initially uniform plasma, the lifetime of a weakly nonlinear plasma wave excited by short driver is limited ion dynamics. The wakefield contains slowly varying radial component, which results in perturbation density profile and consequent destruction wave. We suggest novel method characterizing numerical simulations quantitatively study how scales with mass. also discuss implications on recently proposed generating high-power terahertz radiation counterpropagating wakefields driven...
The AWAKE Collaboration has been formed in order to demonstrate proton-driven plasma wakefield acceleration for the first time. This technique could lead future colliders of high energy but a much reduced length when compared proposed linear accelerators. CERN SPS proton beam CNGS facility will be injected into 10 m cell where long bunches modulated significantly shorter micro-bunches. These micro-bunches then initiate strong with peak fields above 1 GV/m that harnessed accelerate bunch...
The dependence of wakefield amplitude and phase on beam plasma parameters is studied in the parameter area interest for self-modulating proton beam-driven acceleration. shown to be extremely sensitive small variations density, while sensitivity other reasonably low. study large clarifies effects that limit achievable accelerating field different parts space: nonlinear elongation period, insufficient charge drive beam, emittance-driven divergence, motion ions.
Simulations of proton-driven plasma wakefield accelerators have demonstrated substantially higher accelerating gradients compared to conventional and the viability electrons energy frontier in a single stage. However, due strong intrinsic transverse fields varying both radially time, witness beam quality is still far from suitable for practical application future colliders. Here we demonstrate efficient acceleration wakefields hollow channel. In this regime, bunch positioned region with...
In this article, we briefly summarize the experiments performed during first Run of Advanced Wakefield Experiment, AWAKE, at CERN (European Organization for Nuclear Research). The final goal AWAKE 1 (2013 - 2018) was to demonstrate that \unit[10-20]{MeV} electrons can be accelerated GeV-energies in a plasma wakefield driven by highly-relativistic self-modulated proton bunch. We describe experiment, outline measurement concept and present results. Last, our plans future.
By combining the linear theory and numerical simulations, we study response of a radially bounded axisymmetric plasma to relativistic charged particle beams in wide range densities. We present analytical expressions for magnetic field generated dense plasma, demonstrate vanishing wakefield potential beyond trajectory outermost electron, follow change as density decreases. At high densities, wavefronts electron radial electric are distorted due beam charge current neutralization, while...
By means of a hollow plasma, multiple proton bunches work well in driving nonlinear plasma wakefields and accelerate electrons to the energy frontier with preserved beam quality. However, acceleration positrons is different because accelerating structure strongly charge dependent. There trade-off between keeping small normalized emittance spread. This results from conflict that electrons, used provide focusing bunches, dilute positron bunch. loading an extra electron bunch repel meanwhile...
Proton-driven plasma wakefield acceleration has been demonstrated in simulations to be capable of accelerating particles the energy frontier a single stage, but its potential is hindered by fact that currently available proton bunches are orders magnitude longer than wavelength. Fortunately, micro-bunching allows driving waves resonantly. In this paper, we propose using hollow channel for multiple bunch driven and demonstrate it enables operation nonlinear regime resonant excitation strong...
We discovered a novel effect that can cause witness emittance growth in plasma wakefield accelerators. The appears linear or moderately nonlinear waves. experiences time-varying focusing force and loses quality during the time required for drive beam to reach transverse equilibrium with wave. higher charge, lower rate because of additional by its own wakefield. However, head always degrades, boundary between degraded intact parts gradually propagates backward along bunch.
Ion motion in plasma wakefield accelerators can cause temporal increase of the longitudinal electric field shortly before wave breaks. The is caused by re-distribution energy transverse direction and may be important for correct interpretation experimental results acceleration high-quality beams.