Р. И. Спицын
A5042143384- Laser-Plasma Interactions and Diagnostics
- Magnetic confinement fusion research
- Particle Accelerators and Free-Electron Lasers
- High-pressure geophysics and materials
- Laser-Matter Interactions and Applications
- Gyrotron and Vacuum Electronics Research
- Laser-induced spectroscopy and plasma
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Terahertz technology and applications
- Atomic and Molecular Physics
- Particle physics theoretical and experimental studies
- Pulsed Power Technology Applications
- Radiation Therapy and Dosimetry
- Astrophysics and Cosmic Phenomena
- Dust and Plasma Wave Phenomena
- Solar and Space Plasma Dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Pulsars and Gravitational Waves Research
- Laser Material Processing Techniques
- High-Velocity Impact and Material Behavior
Budker Institute of Nuclear Physics
2017-2024
Novosibirsk State University
2017-2024
Siberian Branch of the Russian Academy of Sciences
2017-2021
Campbell Collaboration
2020
University of Lisbon
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)...
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...
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.
We use a relativistic ionization front to provide various initial transverse wakefield amplitudes for the self-modulation of long proton bunch in plasma. show experimentally that, with sufficient amplitude [$\ensuremath{\ge}(4.1\ifmmode\pm\else\textpm\fi{}0.4)\text{ }\text{ }\mathrm{MV}/\mathrm{m}$], phase modulation along is reproducible from event event, 3%--7% (of $2\ensuremath{\pi}$) rms variations all bunch. The not lower amplitudes. observe transition between these two regimes. Phase...
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...
Abstract In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from Super Proton Synchrotron at CERN. The angular distribution protons deflected due to SSM is quantitative measure process, which agrees with simulations by two-dimensional (axisymmetric) particle-in-cell code LCODE about 5%. agreement achieved in population scans two selected plasma densities and scan longitudinal density gradient. reached only case wide enough simulation box (several...
We study experimentally the effect of linear plasma density gradients on self-modulation a 400\,GeV proton bunch. Results show that positive/negative gradient in/decreases number micro-bunches and relative charge per micro-bunch observed after 10\,m plasma. The measured modulation frequency also in/decreases. With largest positive we observe two frequencies in power spectrum. are consistent with changes wakefields' phase velocity due to adding slow during growth predicted by theory.
There is a new effect that can limit the lifetime of weakly nonlinear wakefield in radially bounded plasma. If drive beam narrow, some plasma electrons fall out collective motion and leave radially, forming negatively charged halo around it. These repeatedly return to under action charge separation field, interact with wave cause its damping. The lowest-energy take energy from more efficiently, because their trajectories are bent by towards regions strongest acceleration. For correct...
Plasma wakefield dynamics over timescales up to 800 ps, approximately 100 plasma periods, are studied experimentally at the Advanced Wakefield Experiment (AWAKE). The development of longitudinal amplitude driven by a self-modulated proton bunch is measured using external injection witness electrons that sample fields. In simulation, resonant excitation causes electron trajectory crossing, resulting in potential outside boundary as transversely ejected. Trends consistent with presence this...
Numerical simulations of beam-plasma instabilities may produce quantitatively incorrect results because unrealistically high initial noise from which the develop. Of particular importance is wakefield noise, potential perturbations that have a phase velocity equal to beam velocity. Controlling level in offer possibility extrapolating simulation more realistic low-noise case. We propose novel method for generating with controllable amplitude by randomly located charged rods propagating ahead...
In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from Super Proton Synchrotron (SPS) at CERN. The angular distribution protons deflected due to SSM is quantitative measure process, which agrees with simulations by two-dimensional (axisymmetric) particle-in-cell code LCODE. Agreement achieved for populations between $10^{11}$ and $3 \times 10^{11}$ particles, various plasma density gradients ($-20 \div 20\%$) two densities ($2\times 10^{14} \text{cm}^{-3}$...
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 quasistatic approximation (QSA) is an efficient method of simulating laser- and beam-driven plasma wakefield acceleration, but it becomes imprecise if some particles make long longitudinal excursions in a strongly nonlinear wave, or waves with non-zero group velocity are present the plasma, density gradients sharp, beam shape changes rapidly. We extension to QSA that free from its limitations retains main advantages speed reduced dimensionality. new approach takes into account exchange...
The quasistatic approximation (QSA) is an efficient method of simulating laser- and beam-driven plasma wakefield acceleration, but it becomes imprecise if some particles make long longitudinal excursions in a strongly nonlinear wave, or waves with non-zero group velocity are present the plasma, density gradients sharp, beam shape changes rapidly. We extension to QSA that free from its limitations retains main advantages speed reduced dimensionality. new approach takes into account exchange...