ІA

І. A. Ivanov

Budker Institute of Nuclear Physics

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ВВ

В. В. Поступаев

Budker Institute of Nuclear Physics

104

A. F. Rovenskikh

Budker Institute of Nuclear Physics

S. V. Polosatkin

Budker Institute of Nuclear Physics

K. I. Mekler

Budker Institute of Nuclear Physics

S. L. Sinitsky

Budker Institute of Nuclear Physics

АВ

А. В. Аржанников

Novosibirsk State University

АВ

А. В. Бурдаков

Budker Institute of Nuclear Physics

K. N. Kuklin

Budker Institute of Nuclear Physics

СА

С. А. Кузнецов

Volgograd State Technical University

V. T. Astrelin

Budker Institute of Nuclear Physics

Cooperative Institutions

Budker Institute of Nuclear Physics

146

Siberian Branch of the Russian Academy of Sciences

114

Novosibirsk State University

102

Russian Academy of Sciences

Novosibirsk State Technical University

Institute of Applied Physics

Boreskov Institute of Catalysis

Kharkiv Institute of Physics and Technology

Czech Academy of Sciences, Institute of Plasma Physics

Novosibirsk Tuberculosis Research Institute

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Comparison of tungsten modification after irradiation at different facilities for PSI studies

AIP conference proceedings (2016)

A.A. Shoshin A. S. Arakcheev Ivan A. Bataev В. А. Батаев А. В. Бурдаков

Results from different facilities for plasma-surface interaction (PSI) studies are compared and their relevance to each other and conditions of ITER transient events are discussed. For PSI studies different types of devices were used including open traps, tokamaks, linear plasma machines including quasi-stationary plasma accelerators, electron beams and lasers. The same damage thresholds were demonstrated with different techniques. At energy loads corresponding to ITER transient events (edge localized modes (ELMs), disruptions, etc.) only macroscopic erosion mechanisms are important. They are cracking, droplet formation and macroscopic mass losses of the target. Cracking occurs during cooling stage after irradiations. Details of plasma stream parameters are of secondary importance for cracks formation; only target temperature plays a role. Macroscopic mass losses strongly correspond with melting of a thin surface layer and heat loads play a key role for melting. Heat flux defines the targets surface erosion.

Transient (computer programming)

Surface Modification

10.1063/1.4964220

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Citations (3)

Properties of sub-THz waves generated by the plasma during interaction with relativistic electron beam

AIP conference proceedings (2016)

І. A. Ivanov А. В. Аржанников V. S. Burmasov K. I. Mekler В. В. Поступаев

In the paper, last experiment's results on sub-THz wave emission from the area of relativistic electron beam-plasma interaction in the GOL-PET device are described. A plasma column with the diameter of 6 cm, length of 2.5 m and electron density (0.2-2)×1015 cm−3 is confined by multiple-mirror magnetic field with mean value of 4 T. The relativistic electron beam injected into the column, has the following parameters: energy Eb ∼ 0.8 MeV, current Ib ∼ 30 kA, current density Jb ∼ 2 kA/cm2 in the mean magnetic field. Previous studies have shown that the beam pumps the plasma electron oscillations in a vicinity of the upper hybrid wave branch. These plasma oscillations can be converted in electromagnetic waves on regular or artificial plasma density gradients in a vicinity of upper hybrid frequency. The electromagnetic waves with the double upper hybrid frequency are also generated in the beam-plasma system due to coalescence of the plasma oscillations in case of high level of the oscillation energy density. The described experiments are devoted to measure the spectral properties of the generated radiation and the direction of the sub-THz plasma emission in depending on plasma and beam parameters. As results the wave emission with the specific power concentrated in the direction along the axis of the plasma column, in the frequency interval 0.25-0.5 THz has been obtained at the plasma density about of 1015 cm−3.

Relativistic electron beam

Upper hybrid oscillation

Plasma window

10.1063/1.4964233

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Citations (1)

Experimental and Theoretical Investigations of High Power Sub-Millimeter Wave Emission at Two-Stream Instability of High-Current REB

Fusion Science & Technology (2013)

А. В. Аржанников А. В. Бурдаков V. S. Burmasov P. V. Kalinin С. А. Кузнецов

Sub-mm radiation can be generated by conversion of plasma waves into electromagnetic (EM) radiation at strong Langmuir turbulence (LT) via the two-stream instability induced by a high current relativistic electron beam (REB). A plasmon scattering on plasma density fluctuations produces EM emission at the plasma frequency ωp ("ωp process"). Nonlinear plasmon-plasmon merging results in the generation of photons nearby the 2nd harmonic of the plasma frequency 2ωp (2ωp process"). For plasma densities 1020-1021 m-3, these frequencies are in the range of sub-mm waves: 180-566 GHz. The power density of sub-mm-wave emission from plasmas in the multi-mirror trap GOL-3 (BINP) during injection of a 10-μs-REB at plasma densities ne ≈ (1-5)·1020 m-3, electron temperatures Te ≈ 1-3 keV and magnetic field B ≈ 4 T was measured to be up to 1 kW/cm3 in the frequency band above 100 GHz.To calculate the second harmonic emission power from turbulent magnetized plasma we use the model of coalescence of two upper-hybrid waves. Results of these calculations and measured power are in good coincidence in the investigated area of plasma density.

Whistler

10.13182/fst13-a16878

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Citations (8)

Plasma-surface interaction during ITER transient events: simulation with QSPA Kh-50 and GOL-3 facilities

Voprosy Atomnoj Nauki i Tekhniki (2008)

I.E. Garkusha V.A. Makhlaj V.I. Tereshin N.N. Aksenov А. В. Бурдаков

Transient (computer programming)

Source

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Citations (3)

Surface modification and droplet formation of tungsten under hot plasma irradiation at the GOL-3

Journal of Nuclear Materials (2013)

А. В. Аржанников В. А. Батаев Ivan A. Bataev A. V. Burdakov І. A. Ivanov

Surface Modification

Morphology

10.1016/j.jnucmat.2013.01.143

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Citations (32)

Structure Modification of Different Graphite and Glassy Carbon Surfaces under High Power Action by Hydrogen Plasma

Fusion Science & Technology (2011)

A.A. Shoshin А. В. Аржанников А. В. Бурдаков K. N. Kuklin І. A. Ivanov

The studies of exposing of targets by hot-electron plasma exhaust from the multi-mirror trap GOL-3 are carried out. The results of Raman and SEM studies of surface modification of carbon materials with different ordering range of sp2 fraction (different graphite and glassy carbon) exposed by pulsed hot hydrogen plasma with energy density up to 8 MJ/m2 are presented. It is shown that on the depth up to ~ 80 nm due to this exposing there are obtained two effects – micro structural destruction of the surface and extension of crystallite size of sp2 phase, i.e. ordering of nanostructure.

Glassy carbon

Surface Modification

Carbon fibers

10.13182/fst11-a11631

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Citations (10)

Sub-THz wave generation by magnetized plasma with strong turbulence driven by high-current REB

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) (2013)

А. В. Аржанников V. T. Astrelin А. В. Бурдаков І. A. Ivanov I. V. Kandaurov

The specific power density 1 kW/cm ³ of sub-THz-wave emission from plasma in the multi-mirror trap GOL-3 during injection of 0.5 MV, 2 kA/cm ² 10-ms-relativistic electron beam (REB) at plasma densities n _e ≈ (1-6)·10 ¹⁴ cm ^-3 , electron temperatures T _e ≈ 1 keV and magnetic field B ≈ 4 T was measured in the frequency band 200-500 GHz.

10.1109/irmmw-thz.2013.6665456

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Citations (0)

Arc plasma generator of atomic driver for steady-state negative ion source

Review of Scientific Instruments (2014)

А. А. Иванов Yu. I. Belchenko V. I. Davydenko І. A. Ivanov V. V. Kolmogorov

The paper reviews the results of development of steady-state arc-discharge plasma generator with directly heated LaB6 cathode. This arc-discharge plasma generator produces a plasma jet which is to be converted into an atomic one after recombination on a metallic plate. The plate is electrically biased relative to the plasma in order to control the atom energies. Such an intensive jet of hydrogen atoms can be used in negative ion sources for effective production of negative ions on a cesiated surface of plasma grid. All elements of the plasma generator have an augmented water cooling to operate in long pulse mode or in steady state. The thermo-mechanical stresses and deformations of the most critical elements of the plasma generator were determined by simulations. Magnetic field inside the discharge chamber was optimized to reduce the local power loads. The first tests of the steady-state arc plasma generator prototype have performed in long-pulse mode.

Electric arc

Plasma cleaning

Vacuum arc

Energetic neutral atom

10.1063/1.4835415

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Citations (2)

Experimets on pulse elongation of high-power microsecond e-beam for plasma heating in multi mirror trap GOL-3

А. В. Аржанников V. T. Astrelin V. V. Belykh A. V. Burdakov V.G. Ivanenko

Essential progress was achieved in experiments on heating the dense plasma in the multimirror trap GOL-3 by high-power relativistic electron beam in last few years. The beam parameters at the experiments were the following: electron energy ~1 MeV, beam current ~25 kA, beam current density in plasma ~2 kA/cm ² , pulse duration 9 mus, total energy of the beam pulse ~150 kJ. Due to the high level of the current density and effect of a novel mechanism of ion heating the temperature of ions reached 2-3 keV at the electron temperature about 3 keV for the plasma density ~10 ¹⁵ cm ^-3 . Energy confinement time of the plasma in these experiments has reached the level of 1 ms. The mechanism of fast ion heating is based on the collective ion acceleration along the magnetic field lines produced by high-gradients of the electron pressure in the plasma due to enhanced heating in the mirrors. The basic condition for such mechanism realization is anomalously low electron thermal conductivity along the trap axis which is provided by small scale Langmuir turbulence developing as result of two-stream instability. In order to analyze fusion prospects of such way of plasma heating in the long solenoid trap it is necessary to investigate experimentally the possibility of further increase of plasma parameters by the elongation of the beam pulse. As the first step on solving this task we have performed the experiments at the accelerator U-2 on 1.5 fold increase of the e-beam duration. Results of these experiments are presented in this paper. Conditions for durable generation in magnetically insulated diode, stable transportation and compression in the magnetic field of intense REB found in the experiments, permit us to increase the beam pulse duration from 9 mus to 14 mus with somewhat less energy of the electrons but with the same level of the energy content in the pulse. In the paper we describe the experiments on the diode voltage shaping for better matching of pulse generator with the accelerator diode as well as the results of measurements of the beam cross section by means of X-ray obscure and sectional calorimeter. Also we discuss the directions of future investigations aimed to the increase of the beam parameters in order to obtain (5-10) keV temperature of the plasma confined in multimirror trap.

10.1109/plasma.2008.4590795

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Citations (0)

Study of the mechanism for fast ion heating in the GOL-3 multimirror magnetic confinement system

Plasma Physics Reports (2005)

А. В. Аржанников V. T. Astrelin А. В. Бурдаков І. A. Ivanov V. S. Koǐdan

Electron temperature

10.1134/1.1947331

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Citations (29)