A5037863259- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Laser-induced spectroscopy and plasma
- Particle accelerators and beam dynamics
- Nuclear Materials and Properties
- Laser Design and Applications
- Gyrotron and Vacuum Electronics Research
- Solar and Space Plasma Dynamics
- Fluid Dynamics and Turbulent Flows
- Superconducting Materials and Applications
- Spectroscopy and Laser Applications
- Atomic and Molecular Physics
- Terahertz technology and applications
- Atomic and Subatomic Physics Research
- Laser Material Processing Techniques
- Pulsed Power Technology Applications
- Physics of Superconductivity and Magnetism
- Vacuum and Plasma Arcs
- Atmospheric and Environmental Gas Dynamics
- Meteorological Phenomena and Simulations
- Surface Roughness and Optical Measurements
- Plasma Applications and Diagnostics
Budker Institute of Nuclear Physics
2015-2024
Siberian Branch of the Russian Academy of Sciences
2015-2024
Novosibirsk State University
2014-2024
Novosibirsk State Technical University
2016-2022
Boreskov Institute of Catalysis
2022
Russian Academy of Sciences
2008-2012
National Institute for Fusion Science
2001-2006
University of Pisa
1993-1996
Two-dimensional phase contrast imaging (2D) installed on the large helical device (LHD) is a unique diagnostic for local turbulence measurements. A 10.6 microm infrared CO(2) laser and 6x8 channel HgCdTe 2D detector are used. The length of scattering volume larger than plasma size. However, asymmetry structure with respect to magnetic field shear make measurements possible. From image integrated fluctuations, spatial cross-correlation function was estimated using time domain correlation...
A test facility developed at the Budker Institute is designed for experimental simulation of effects ITER-scale transient heat loads on plasma facing materials. Employing a long-pulse electron beam creation transients has advantages low direct pressures surface material and lesser limitation power density by vapor shielding. In addition, relative modest attendant background light allows using set diagnostics observation erosion dynamics. The includes fast imaging in near infrared, scattering...
Abstract A boron carbide coating, deposited on tungsten using the detonation spraying method, was tested under high pulse number transient heat loads expected during ITER tokamak H-mode operation. The were relevant to those caused by edge localized modes (ELMs) and mitigated disruptions. results showed that in case of ELM-like heating first wall zone tokamak, coating is capable withstand ∽10 4 pulses before detachment from substrate. In thermal shocks with more intense plasma disruptions or...
A variety of electron density (ne) profiles have been observed in the Large Helical Device (LHD). The change dramatically with heating power and toroidal magnetic field (Bt). particle transport coefficients, i.e. diffusion coefficient (D) convection velocity (V) are experimentally obtained standard configuration from modulation experiments. values D V estimated separately core edge. coefficients found to be a function temperature (Te), vary Bt. Edge proportional . Non-zero is observed, it...
AbstractRecent results of the experiments at GOL-3 facility are presented. In present configuration device, plasma with a density 1014[divided by]1016 cm-3 is confined in 12-meter-long solenoid, which comprises 55 corrugation cells mirror ratio Bmax/Bmin=4.8/3.2 T. The solenoid heated up to 2-4 keV temperature by high power relativistic electron beam (˜1 MeV, ˜30 kA, ˜8 μs, ˜120 kJ) injected through one ends. Mechanism experimentally observed fast ion heating, issues stability and...
AbstractThis paper describes the interferometer systems on Large Helical Device (LHD). LHD is equipped with five systems, each of which has a different operational purpose and measurable electron density range. A single-channel millimeter-wave mainly used for low-density plasmas along horizontal line sight equatorial plane. Wavelengths 1 2 mm are vibration compensation based two-color interferometry, been since first operation LHD. 13-channel CH3OH laser (wavelength 119 μm) covers almost...
The paper presents results of measurements sub-terahertz electromagnetic emission from magnetized plasma during injection a powerful relativistic electron beam microsecond duration in with the density 3 × 1014 cm−3. It was found that spectrum radiation concentrated three distinct regions high level spectral power density. first region is located near f1 = 100 GHz; second one vicinity 190 GHz, and third frequency interval f3 280–340 GHz. Polarization vectors (f1 f3) are directed mainly...
AbstractThe paper reviews recent experimental results from GOL-3. Currently efforts are focused on further development of a physical database for multiple-mirror confinement systems and also an upgrade plasma heating GOL-3 device.In general, current parameters demonstrate good prospects trap as fusion reactor.
A high ion temperature (Ti) was achieved using a combination of perpendicular and parallel injected neutral beams in the Large Helical Device (LHD). Microturbulence spatial profiles high-Ti discharge were measured by two-dimensional phase contrast imaging (2D-PCI) through almost entire vertical central chord. The 2D-PCI microturbulence spectral ranges covered wavenumbers (k) 0.1-1 mm−1 frequencies (f) 20-500 kHz. thermal conductivity (χi) increased region with increasing Ti. However,...
AbstractFirst experimental results on microwave radiation at double plasma frequency from heated by ~100 keV, 2-10 MW electron beam of μs duration in GOL-3 are presented. Measurements were done 75-200 GHz band. The spectrum was peaked ~94 ~3·1013 cm-3 density, the temporal behavior radiated power spiky. generation efficiency reached ~1% total power.
An analysis method for unfolding the spatially resolved wave-number spectrum and phase velocity from 2D CO2 laser contrast imaging system on large helical device is described. This based magnetic shear technique which identifies propagation direction spatial Fourier of images detected by a 6 × 8 detector array. Because strongest modes have at lower end instrumental k range, high resolution spectral techniques are necessary to clearly resolve hence distribution fluctuations along probing...
A test facility for experimental simulation of transient heat loads in ITER divertor with the use high power electron beam is developed at Budker Institute Nuclear Physics. This report presents an study absorption incident flux 10-50 GW/m2 on area about 2 cm2 a tungsten target. The has duration 0.1-0.3 ms and energy 80-95 keV, Diagnostics measuring parameters target are briefly discussed. Results measurement profile calorimetry deposited sample ELM-like load presented.
Particle confinement processes are studied in detail on the Large Helical Device (LHD). Diffusion coefficients (D) and convection velocities (V) estimated from density modulation experiments. The magnetic configuration collisionality widely scanned order to investigate parameter dependences of D V. To study effect configuration, axis positions (Rax) 3.5 3.9 m. This scan changes ripples quite significantly, enabling effects neoclassical properties measured values be elucidated. Dependences...
Novel technology of electron beam generation for plasma heating in GOL-3 was developed and the first time used experiment. The distinctive features new are non-relativistic energy, medium power sub-ms duration. experiments were done at following parameters: ~100 keV, ~10 MW, >100 μs, ~1020 m-3. safely transported through 13-m-long deuterium-filled multiple-mirror solenoid. created then heated by beam. Main physical task reported to reach quasi-stationary conditions during long-pulse injection.
Experimental research on behavior of rolled tungsten plates under intense transient heat loads generated by a powerful (a total power up to 7 MW) long-pulse (0.1–0.3 ms) electron beam with full irradiation area 2 cm2 was carried out. Imaging the sample fast CCD cameras in NIR range and illumination 532 nm continuous-wave laser applied for in-situ surface diagnostics during exposure. In these experiments were exposed 0.5–1 MJ/m2 flux factor (Fhf) close above melting threshold at initial room...
C O 2 laser based phase contrast interferometer was used previously on LHD to study plasma density microfluctuations. New two-dimensional 6×8 elements array of CdHgTe photoconductors employed for detection. In addition commonly measured intensity, frequency spectrum, and two-point correlation detector allows determining the direction propagation waves in plasma. From angular distribution it is possible obtain localized along viewing line properties fluctuations using strong magnetic shear...
This paper describes results of studies on application high current (1–10 kA) relativistic electron beams to generate millimeter and subterahertz (sub-THz) radiation in two ways. The first one is realized at the ELMI-device where scheme a free maser (FEM) with sheet beam applied for case planar two-beam-channel geometry. second way based emission sub-THz from plasmas turbulence induced by strong beam. These experiments are carried out GOL-3 facility. We present experimental obtained these...
In the work presented here dynamics of spiky microwave emission a beam-heated plasma near double frequency in ∼100 GHz band was studied. The is heated by 80 keV, ∼2 MW, sub-ms electron beam that injected into multiple-mirror trap GOL-3. diameter order emitted wavelength. Modulation individual spikes radiation found. observed can be attributed to small number compact emitting zones are periodically distorted.
New results are presented on studying the beam-plasma interaction and plasma heating dynamics at INAR device. The specific features of generation 'hot' (E>approximately 1keV) electrons containing main part energy studied. In case a beam with small initial angular spread, mainly generated near point where is injected into plasma. Also reported experiments in which magnetic field region was increased up to 70 kOe. this case, length 75 cm, total losses exceed 40%. growth content higher...
A multichannel imaging heterodyne interferometer is installed on Large Helical Device. Two branches of the interferometer: one with CO2 laser (wavelength λi=10.6 μm) and other diode pumped yttritium–aluminium–garnet (YAG) λi=1.06 are used for electron density measurements vibration compensation. slab beams circular beam injected vertically. Liquid nitrogen cooled linear detector arrays detection room temperature employed single beams. Avalanche photodiodes record signals YAG Chordal...