V. Verzilov
A5045352661- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Advanced X-ray Imaging Techniques
- Crystallography and Radiation Phenomena
- Magnetic confinement fusion research
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Radiation Therapy and Dosimetry
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Gyrotron and Vacuum Electronics Research
- Electron and X-Ray Spectroscopy Techniques
- Plasma Diagnostics and Applications
- Nuclear materials and radiation effects
- Radiation Detection and Scintillator Technologies
- Pulsed Power Technology Applications
- Graphite, nuclear technology, radiation studies
- Ionosphere and magnetosphere dynamics
- Laser-Matter Interactions and Applications
- Medical Imaging Techniques and Applications
- Solar and Space Plasma Dynamics
- Photocathodes and Microchannel Plates
- Terahertz technology and applications
TRIUMF
2015-2024
Campbell Collaboration
2020-2022
Google (United States)
2019
European Organization for Nuclear Research
2018
University of Oslo
2016
AREA Science Park
2003-2004
Elettra-Sincrotrone Trieste S.C.p.A.
2004
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
1998-2003
Tomsk Polytechnic University
1989-2001
Istituto Nazionale di Fisica Nucleare
1998-2001
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...
Experimental results are presented from vacuum-ultraviolet free-electron laser (FEL) operating in the self-amplified spontaneous emission (SASE) mode. The generation of ultrashort radiation pulses became possible due to specific tailoring bunch charge distribution. A complete characterization linear and nonlinear modes SASE FEL operation was performed. At saturation produces (30-100 fs FWHM) with a peak power GW level full transverse coherence. wavelength tuned range 95-105 nm.
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 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,...
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...
Measurements of coherent diffraction radiation from a slit variable width generated by short electron bunches were performed in millimeter and submillimeter ranges. Experimental data are compared with the transition case theoretical predictions. A more realistic description than conventional theory is necessary to account for correctly. No noticeable difference estimated bunch length was observed using wide range widths radiation.
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.
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...
An evaluation of the optical transition radiation (OTR) single particle image dimension is obtained using diffraction theory based on a realistic description source. This approach allows analysis effect finite size emitting screen and imaging system. The role practical experimental conditions in treating intensity tail problem estimated. It shown that, by exploiting polarization properties OTR, considerable enhancement spatial resolution can be achieved, which becomes very similar to that...
The AWAKE collaboration prepares a proton driven plasma wakefield acceleration experiment using the SPS beam at CERN. A long bunch extracted from interacts with high power laser and 10 m rubidium vapor cell to create strong wakefields allowing sustained electron acceleration. probe these is created by an accelerator consisting of rf-gun booster structure. This source should provide beams intensities between 0.1 1 nC, lengths 0.3 3 ps emittance order 2 mm mrad. structure accelerate electrons...
The efficiency of positron production by a 1.2-GeV electron beam incident on tungsten single crystal oriented in an axially channeling condition has been experimentally studied. Positron yields from 1.2-mm-thick have measured to be $\ensuremath{\sim}2.5--3.0$ times larger than those amorphous targets with the same thickness. A simple model simulation process shows that coherent bremsstrahlung, as well radiation, contributes enhancement yields.
We study experimentally the longitudinal and transverse wakefields driven by a highly relativistic proton bunch during self-modulation in plasma. show that wakefields' growth amplitude increase with increasing seed as well charge using maximum radius of distribution measured on screen downstream from externally injecting electrons measuring their final energy. Measurements agree trends predicted theory numerical simulations validate our understanding development self-modulation. Experiments...
The AWAKE project at CERN is planned to study proton driven plasma wakefield acceleration. beam from the SPS will be used in order drive wakefields a 10 m long Rubidium cell. In first phase of this experiment, scheduled 2016, self-modulation studied detail, while second an external electron injected into probe acceleration process. installation former CNGS experimental area and required optics flexibility define tight boundary conditions fulfilled by line design. transport low energy (10-20...
ARIEL is the new TRIUMF facility for production of radioactive ion beams that will enable delivery three simultaneous RIB to ISAC experimental stations. Two additional target stations produce by using either a 50 kW proton or from 500 electrons via photofission. The electron beam driver going be MeV 10 mA CW superconducting linac. first stage e-linac installation completed and commissioning underway. paper present design characteristics, installation, strategy current results.
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...
Results of the first experimental search for effect prewave zone in near-infrared transition radiation are presented. A substantial difference spatial distribution relation two different wavelengths (450 nm and 1600 nm) was observed. Experimental data a good, though not complete, agreement with theory.
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.
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.