Alexander Valishev
A5028627998- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Gyrotron and Vacuum Electronics Research
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Advanced X-ray Imaging Techniques
- Electron and X-Ray Spectroscopy Techniques
- Laser-Plasma Interactions and Diagnostics
- Photonic and Optical Devices
- Advanced Electron Microscopy Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Crystallography and Radiation Phenomena
- Geophysics and Sensor Technology
- Electromagnetic Simulation and Numerical Methods
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Advancements in Photolithography Techniques
- Optical Systems and Laser Technology
- Distributed and Parallel Computing Systems
- Photocathodes and Microchannel Plates
Fermi National Accelerator Laboratory
2015-2024
PCL Construction (Canada)
2024
University of Chicago
2020-2021
Northern Illinois University
2020
Argonne National Laboratory
2019
University Hospital Frankfurt
2015
Goethe University Frankfurt
2015
Brookhaven National Laboratory
2012
European Organization for Nuclear Research
2012
Fermi Research Alliance
2012
The Integrable Optics Test Accelerator (IOTA) is a storage ring for advanced beam physics research currently being built and commissioned at Fermilab. It will operate with protons electrons using injectors momenta of 70 150 MeV/c, respectively. program includes the study nonlinear focusing integrable optical lattices based on special magnets electron lenses, dynamics space-charge effects their compensation, stochastic cooling, several other experiments. In this article, we present design...
A novel concept of controlled halo removal for intense high-energy beams in storage rings and colliders is presented. It based on the interaction circulating beam with a 5-keV, magnetically confined, pulsed hollow electron 2-m-long section ring. The electrons enclose beam, kicking particles transversely leaving core unperturbed. By acting as tunable diffusion enhancer not hard aperture limitation, collimator extends conventional collimation systems beyond intensity limits imposed by...
The cross section of the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ was measured in Spherical Neutral Detector (SND) experiment at VEPP-2M collider energy region $\sqrt{s}$ below 980 MeV. This measurement based on about $1.2\ifmmode\times\else\texttimes\fi{}{10}^{6}$ selected events. obtained analyzed together with SND and DM2 data up to 2 GeV. $\ensuremath{\omega}$-meson parameters...
Results of the study e+e-->pi0 gamma process with SND detector at VEPP-2M collider in c.m.s. energy range sqrt(s)=0.60-0.97 GeV are presented. Using 36513 selected events corresponding to a total integrated luminosity 3.4 pb^-1 cross section was measured. The dependence analyzed framework vector meson dominance model. data well described by sum phi,omega,rho0->pi0 decay contributions measured probabilities: Br(omega->pi0 gamma)=(9.34+-0.15+-0.31)% and Br(rho0->pi0...
The Tevatron in Collider Run II (2001--present) is operating with 6 times more bunches, many higher beam intensities and luminosities than I (1992--1995). Electromagnetic long-range head-on interactions of high intensity proton antiproton beams have been significant sources loss lifetime limitations. We present observations the beam-beam phenomena results relevant studies. analyze data various methods employed operations, predict performance for planned luminosity upgrades, discuss ways to...
Collimation of proton and antiproton beams in the Tevatron collider is required to protect CDF D0 detectors minimize their background rates, keep irradiation superconducting magnets under control, maintain long-term operational reliability, reduce impact beam-induced radiation on environment. In this article we briefly describe design, practical implementation performance collimation system, methods control transverse longitudinal beam halo two novel techniques tested Tevatron.
Modern and future particle accelerators employ increasingly higher intensity brighter beams of charged particles become operationally limited by coherent beam instabilities. Usual methods to control the instabilities, such as octupole magnets, feedback dampers use chromatic effects, less effective insufficient. We show that, in contrast, Lorentz forces a low-energy, magnetically stabilized electron beam, or "electron lens", easily introduces transverse nonlinear focusing sufficient for...
The time evolution of beam losses during a collimator scan provides information on halo diffusion and population. This is an essential input for machine performance characterization the design collimation systems. Beam measurements in CERN Large Hadron Collider were conducted through scrapings dedicated study first at 4 TeV. Four scans performed with two collimators, vertical plane 1 horizontally 2, before after bringing beams into collisions. Inward outward steps performed. A model was used...
The e+e- -> pi+pi-pi+pi- cross section has been measured using 5.8/pb of integrated luminosity collected with the CMD-2 detector at VEPP-2M collider. Analysis data a refined efficiency determination and use both three- four-track events allowed doubling sample reduction systematic errors to 5-7%.
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