Victor Smaluk
A5028805686- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Particle physics theoretical and experimental studies
- Advanced X-ray Imaging Techniques
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Electron and X-Ray Spectroscopy Techniques
- Advanced Electron Microscopy Techniques and Applications
- Magnetic confinement fusion research
- Crystallography and Radiation Phenomena
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Photonic and Optical Devices
- Muon and positron interactions and applications
- Photocathodes and Microchannel Plates
- Laser-Plasma Interactions and Diagnostics
- Electromagnetic Simulation and Numerical Methods
- Integrated Circuits and Semiconductor Failure Analysis
- Electrostatic Discharge in Electronics
- Advancements in Photolithography Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Plasma Diagnostics and Applications
Brookhaven National Laboratory
2016-2025
National Synchrotron Light Source II
2017-2025
Argonne National Laboratory
2003-2024
Budker Institute of Nuclear Physics
2008-2023
Stanford Synchrotron Radiation Lightsource
2017
Diamond Light Source
2014-2015
Novosibirsk State University
2010-2014
Russian Academy of Sciences
2009-2012
Siberian Branch of the Russian Academy of Sciences
2009
Elettra-Sincrotrone Trieste S.C.p.A.
2002-2004
The electron-positron collider DAPhiNE, the Italian Phi factory, has been recently upgraded in order to implement an innovative collision scheme based on large crossing angle, small beam sizes at point, and compensation of beam-beam interaction by means sextupole pairs creating a "crab-waist" configuration region. Experimental tests novel exhibited increase factor 3 peak luminosity with respect performances reached before upgrade. In this Letter we present new scheme, discuss its advantages,...
Driven by life-science applications, a mega-electron-volt Scanning Transmission Electron Microscope (MeV-STEM) has been proposed here to image thick frozen biological samples as conventional (TEM) may not be suitable thicker than 300–500 nm and various volume electron microscopy (EM) techniques either suffering from low resolution, or speed. The high penetration of inelastic scattering signals MeV electrons could make the MeV-STEM an appropriate microscope for 10 μm more with nanoscale...
We investigate properties of optical elements in the cavity an x-ray laser oscillator with emphasis on power loss a monochromatic Gaussian radiation beam upon passing through them using analytical and numerical approaches. Here we assume comprises refractive lenses Bragg crystals exploiting symmetric scattering. For lens, include focusing curvature effects while angular filtering due to finite Darwin width crystal. Our results indicate feasibility out-coupling range 0.5%–28% intracavity...
High-resolution imaging using Transmission Electron Microscopy (TEM) is essential for applications such as grain boundary analysis, microchip defect characterization, and biological imaging. However, TEM images are often compromised by electron energy spread other factors. In mode, where the objective projector lenses positioned downstream of sample, electron–sample interactions cause loss, which adversely impacts image quality resolution. This study introduces a simulation tool to estimate...
A measurable chaos indicator is used as the online optimization objective in tuning a complicated nonlinear system—the National Synchrotron Light Source-II storage ring. Through analyzing Shannon entropy measured Poincaré maps, not only can commonly characterizations be extracted, but more importantly, quantified and then for an regularization of these maps. The method itself general applicable to other tunable systems well. Published by American Physical Society 2025
To optimize electron energy for in situ imaging of large biological samples up to 10 μm thickness with nanoscale resolutions, we implemented an analytical model based on elastic and inelastic characteristic angles. This has been benchmarked by Monte Carlo simulations can be used predict the transverse beam size broadening as a function while probe traverses through sample. As result, optimal choice realized. In addition, impact dose-limited resolution was analysed. While sample is less than...
We report the final results of a study ψ(3770) meson using data sample collected with KEDR detector at VEPP-4M electron–positron collider. The analysis takes into account interference between resonant and nonresonant DD¯ production, where latter is related to part energy-dependent form factor FD. vector dominance approach several empirical parameterizations have been tried for FDNR(s). Our mass total width areM=3779.2−1.7+1.8−0.7+0.5−0.3+0.3MeV,Γ=24.9−4.0+4.6−0.6+0.5−0.9+0.2MeV, first,...
A high-precision determination of the main parameters \psi(2S) resonance has been performed with KEDR detector at VEPP-4M e^{+}e^{-} collider in three scans -- \psi(3770) energy range. Fitting dependence multihadron cross section vicinity we obtained mass value M = 3686.114 +- 0.007 0.011 ^{+0.002}_{-0.012} MeV and product electron partial width by branching fraction into hadrons \Gamma_{ee}*B_{h} 2.233 0.015 0.037 0.020 keV. The third error quoted is an estimate model result due to...
Using the inclusive photon spectrum based on a data sample collected at $J/\psi$ peak with KEDR detector VEPP-4M $e^+e^-$ collider, we measured rate of radiative decay $J/\psi\to\gamma\eta_{\rm c}$ as well $\eta_{\rm mass and width. Taking into account an asymmetric lineshape obtained $\Gamma^0_{\gamma\eta_{\rm c}}=2.98\pm0.18 \phantom{|}^{+0.15}_{-0.33}$ keV, $M_{\eta_{\rm c}} = 2983.5 \pm 1.4 \phantom{|}^{+1.6}_{-3.6}$ MeV/$c^2$, $\Gamma_{\eta_{\rm 27.2 3.1 \phantom{|}^{+5.4}_{-2.6}$ MeV.
The DAΦNE collider has been recently upgraded in order to implement a new collision scheme based on large Piwinski angle and cancellation of the synchro-betatron resonances by means electromagnetic sextupoles (Crab-Waist compensation). novel approach proved be effective improving beam-beam interaction luminosity. results measurements taken during commissioning as well perspectives for SIDDHARTA run are presented discussed.
A novel algorithm for self-consistent simulations of long-range wakefield effects has been developed and applied to the study both longitudinal transverse coupled-bunch instabilities at NSLS-II. The is implemented in new parallel tracking code space (self-consistent collective effects) discussed paper. applicable accurate beam dynamics cases where bunch-to-bunch intrabunch motions need be taken into account, such as chromatic head-tail on instability a with nonuniform filling pattern, or...
One of the important issues in-vacuum undulator design is coupling impedance vacuum chamber, which includes tapered transitions with variable gap size. To get complete and reliable information on impedance, analytical estimate, numerical simulations beam-based measurements have been performed at Diamond Light Source, a forthcoming upgrade introducing additional insertion device (ID) straights. The an already existing ID vessel geometrically similar to new one has measured using orbit bump...
Impedance modeling for accelerator applications has improved over the years, largely as a result of advances in simulation capabilities. While this been successful reproducing certain measurements, it is still significant challenge to predict collective effects real machines. In paper, we review our approach impedance and subsequent simulations effects. We discuss choice electrodynamics codes required computer power resources, geometric, resistive wall impedances, their comparison with...
We investigate properties of optical elements in the cavity an X-ray free electron laser oscillator with emphasis on power loss a monochromatic Gaussian radiation beam upon passing through them using analytical and numerical approaches. Here we assume comprises refractive lenses Bragg crystals exploiting symmetric scattering. For lens, include focusing curvature effects while angular filtering due to finite Darwin width crystals. Our results indicate feasibility outcoupling range 0.5-28 %...
To align with the global trend of integrating synchrotron light source (SLS) and free electron laser (FEL) facilities on one site, in line examples such as SPring-8 SACLA Japan ELETTRA FERMI Italy, we actively explore FEL options leveraging ultralow-emittance beam NSLS-II upgrade. These show promising potential for synergy storage ring (SR) operations, thereby significantly enhancing our facility’s capabilities. Echo-enabled harmonic generation (EEHG) is well-suited to SR-based FELs, has...
We present a detailed derivation of formula for the small-gain calculation an x-ray free electron laser oscillator (XFELO) based on medium-energy (3–4 GeV) storage ring. found harmonic lasing and strong focusing are essential this beam energy range. Taking small-signal low-gain developed by Kim his colleagues, we modified it in such way that gain can be calculated without “no approximation,” applied, as well lasing. In formula, is represented product two factors with one them depending only...
The resolution of a mega-electron-volt scanning transmission electron microscope (MeV-STEM) is primarily governed by the properties incident beam and angular broadening effects that occur within thick biological samples microchips. A precise understanding mitigation these constraints require detailed knowledge emittance, aberrations in STEM column optics, energy-dependent elastic inelastic critical angles materials being examined. This simulation study proposes standardized experimental...
The products of the electron width J/\psi meson and branching fraction its decays to lepton pairs were measured using data from KEDR experiment at VEPP-4M electron-positron collider. results are \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-)=(0.3323\pm0.0064\pm0.0048) keV, \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)=(0.3318\pm0.0052\pm0.0063) keV. Their combinations \Gamma_{ee}\times(\Gamma_{ee}+\Gamma_{\mu\mu})/\Gamma=(0.6641\pm0.0082\pm0.0100) \Gamma_{ee}/\Gamma_{\mu\mu}=1.002\pm0.021\pm0.013 can...
Having previously reported that separating the two stages of echo-enabled harmonic generation (EEHG) with one or more bending magnet (BM) sections allows BMs to serve as desired source momentum compaction, here we demonstrate this arrangement can greatly reduce total energy modulation required by any 4th synchrotron light source, leading higher repetition rates well stronger coherent radiation output power, significant benefits. Since EEHG beamline performance is mainly determined beam...
In the design of vacuum chamber a storage ring, special care has to be taken keep impedance as low possible, in order not degrade quality circulating beam. Since start commissioning Italian synchrotron light source ELETTRA 1993, several gap insertion chambers with internal aperture 14 mm have been installed into ring. Monitoring their individual impedances and effects carried out measurements on electron beam after each new installation. The subsequent evolutions total longitudinal...