A5103093498- Gyrotron and Vacuum Electronics Research
- Particle Accelerators and Free-Electron Lasers
- Terahertz technology and applications
- Advanced X-ray Imaging Techniques
- Laser-Plasma Interactions and Diagnostics
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Superconducting and THz Device Technology
- Crystallography and Radiation Phenomena
- Laser Design and Applications
- Laser-Matter Interactions and Applications
- Particle Detector Development and Performance
- Advanced Electron Microscopy Techniques and Applications
- Photonic and Optical Devices
- Photocathodes and Microchannel Plates
- Electromagnetic Compatibility and Measurements
- Advanced Measurement and Metrology Techniques
- Ocular and Laser Science Research
- Vacuum and Plasma Arcs
- Optical measurement and interference techniques
- Infrared Target Detection Methodologies
- Advanced Measurement and Detection Methods
- Atomic and Subatomic Physics Research
- Photonic Crystal and Fiber Optics
- Electromagnetic Simulation and Numerical Methods
National Research Tomsk State University
2010-2024
Tomsk Polytechnic University
2010-2024
High Energy Accelerator Research Organization
2013-2018
Institute of Physics and Technology
2017-2018
A novel scheme for the focusing of high-energy leptons in future linear colliders was proposed 2001 [P. Raimondi and A. Seryi, Phys. Rev. Lett. 86, 3779 (2001)]. This has many advantageous properties over previously studied schemes, including being significantly shorter a given energy having better bandwidth. Experimental results from ATF2 accelerator at KEK are presented that validate operating principle such by demonstrating demagnification 1.3 GeV electron beam down to below 65 nm height...
We present the response time measurements of a Cs2Te photocathode illuminated with two 100 fs duration, variable separation laser pulses at 266 nm wavelength. The was confirmed in dispersive region downstream 12-cell standing wave S-band acceleration structure using well-known RF zero-crossing technique. At same it also measured by changing mechanical path-length difference between micro-bunches. Both methods agree that is order 250 and thereby possible to generate control THz sequence...
This paper demonstrates the application of a polarization current approach to estimate yield soft x-ray Cherenkov radiation when charged particle travels in vicinity finite-size screen. To account for resonant anomalous dispersion complex permittivity, we apply formalism atomic scattering factor. We derived simple analytical expression field, which allows us determine all properties wide energy range emitted particle. The influence screen sizes on characteristics is determined by macroscopic...
Optical transition radiation (OTR) has become a commonly used method for 2D beam imaging measurements. In the Accelerator Test Facility 2 (ATF2) at KEK, sizes smaller than OTR point spread function have been measured. Simulations of system performed using ZEMAX software to study effects optical errors such as aberrations, diffraction, and misalignments components. This paper presents comparison simulations with experimental data obtained ATF2. It shows how quantification control impacts on...
Micro-bunched particle beams are used for a wide range of research including wakefield-based acceleration and tunable sources radiation. In all applications, accurate non-destructive monitoring the bunch-to-bunch separation is required. With development femtosecond lasers, generation micro-bunched directly from photocathode becomes routine; however, still challenge. We present results proof-of-principle experiments conducted at Laser Undulator Compact X-ray accelerator measuring distance...
In radiation processes such as a transition radiation, diffraction etc. based on relativistic electrons passing through or near an opaque screen, the electron self-field is partly shadowed after screen over distance of order formation length $\gamma^2\lambda$. This effect has been investigated coherent (DR) by bunches. Absorbing and conductive half-plane screens were placed at various distances L before standard DR source (inclined mirror). The intensity was reduced when small same side...
Investigation of coherent Smith-Purcell radiation (SPR) spectral characteristics was performed both experimentally and by numerical simulation. The measurement SPR line shapes different diffraction orders carried out at the KEK LUCX facility. A pair room-temperature Schottky barrier diode (SBD) detectors with sensitivity bands 60--90 GHz 320--460 used in measurements. Reasonable agreement experimental results simulations CST Studio Suite justifies use narrow-band SBD to investigate orders....
The interest in producing ultrashort electron bunches has risen sharply among scientists working on the design of high-gradient wakefield accelerators. One attractive approach generating is to illuminate a photocathode with train femtosecond laser pulses. In this paper we describe and testing system for an rf gun based commercial titanium-sapphire technology. technology allows production four pulses continuously variable pulse delay. We also use designed demonstrate experimental generation...
The design of a compact Fabry-Pérot interferometer (FPi) and results the experimental studies carried out using device are presented. Our FPi uses freestanding wire-grid polarizers (WGPs) as beamsplitters is suitable for use at terahertz (THz) frequencies. was studied LUCX facility, KEK, Japan, an 8 MeV linear electron accelerator used to generate coherent Smith-Purcell radiation. designed be easy align reposition experiments facilities. All components were required have flat or well...
Optical transition radiation (OTR) arising when a relativistic charged particle crosses boundary between two media with different optical properties is widely used as tool for diagnostics of beams in modern accelerator facilities. The resolution the beam profile monitors based on OTR depends effects system such spherical and chromatic aberrations diffraction. In this paper we present systematic study influencing monitor resolution. Obtained results have shown that can be sub-micrometer...
A layout for the investigation coherent Cherenkov radiation from a dielectric target with large spectral dispersion and diffraction conducting screen as tool non-invasive longitudinal electron beam profile diagnostics are proposed 20∼30MeV Linac at Shanghai Institute of Applied Physics (SINAP). In this paper status joint experiment future plans presented.
The problem of "semi-bare electron" was first considered in frame quantum electrodynamics by E.L. Feinberg 1980. In theory classical this touched on articles N.F. Shul'ga and X. Artru. 2008 the experimental investigations phenomenon millimeter wavelength region were started group scientists, including authors article. Used technique allowed us to study effect macroscopic mode. paper we present results direct observation a semi-bare electron coulomb field recovery. state obtained passing beam...
The first observation and investigation of a new mechanism resonant Cherenkov diffraction radiation appearing when relativistic 6 MeV electrons move alongside periodically shaped Teflon target have been presented analysed. Numerical simulations performed using computer code KARAT are in good agreement with the experimental results. This is promising technique for generation monochromatisation THz sub-THz beams that could be integrated into any short bunch linear accelerator facility...
Geometry of Vavilov-Cherenkov (VChR) radiation when an electron moves close to a dielectric target is in analogy diffraction (DR) geometry. In this case we may expect DR generation from the upstream face besides that VChR. The joint observation these booth types very interesting pseudo-photon viewpoint, which applicable for relativistic electrons. Unexpected results obtained our experiment insist on reflection about nature both and was performed beam microtron Tomsk Polytechnic University.
We investigated a corrugated mm-scale capillary as compact accelerating structure in the driver-witness acceleration scheme, and suggested methodology to measure of witness bunch. The fields produced by driver bunch energy spread with constant inner radius were measured simulated for both on-axis off-axis beam propagation. Our simulations predicted change field capillary. Also, an approximately twofold increase gain on first cycle was expected capillaries These results confirmed experiment,...
Numerical simulations of Backward Transition Radiation originating from a flat ideally conducting target inclined at 45 degrees with respect to charge propagation direction are presented in this paper. The simulation results compared the theory for wave and pre-wave zones. main characteristics simulated radiation distributions discussed detail.