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Title: MM-wave emission by magnetized plasma during sub-relativistic electron beam relaxation

Abstract

There are described electromagnetic spectra of radiation emitted by magnetized plasma during sub-relativistic electron beam in a double plasma frequency band. Experimental studies were performed at the multiple-mirror trap GOL-3. The electron beam had the following parameters: 70–110 keV for the electron energy, 1–10 MW for the beam power and 30–300 μs for its duration. The spectrum was measured in 75–230 GHz frequency band. The frequency of the emission follows variations in electron plasma density and magnetic field strength. The specific emission power on the length of the plasma column is estimated on the level 0.75 kW/cm.

Authors:
; ; ; ; ; ;  [1];  [2]; ;  [1];  [2]; ; ; ; ; ;  [1]; ;  [3];  [1] more »;  [2];  [2] « less
  1. Budker Institute of Nuclear Physics, 11 Lavrentjev Avenue, Novosibirsk 630090 (Russian Federation)
  2. (Russian Federation)
  3. Novosibirsk State University, 2 Pirogova Street, Novosibirsk 630090 (Russian Federation)
Publication Date:
OSTI Identifier:
22489921
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTRON BEAMS; EMISSION; GHZ RANGE; GOL-3 DEVICE; KEV RANGE; LANGMUIR FREQUENCY; MAGNETIC FIELDS; PLASMA DENSITY; RELATIVISTIC RANGE; RELAXATION; SPECTRA

Citation Formats

Ivanov, I. A., E-mail: Ivanov@inp.nsk.su, Arzhannikov, A. V., Burmasov, V. S., Popov, S. S., Postupaev, V. V., Sklyarov, V. F., Vyacheslavov, L. N., Novosibirsk State University, 2 Pirogova Street, Novosibirsk 630090, Burdakov, A. V., Sorokina, N. V., Novosibirsk State Technical University, 20 Karl Marx Avenue, Novosibirsk 630092, Gavrilenko, D. E., Kasatov, A. A., Kandaurov, I. V., Mekler, K. I., Rovenskikh, A. F., Trunev, Yu. A., Kurkuchekov, V. V., Kuznetsov, S. A., Polosatkin, S. V., Novosibirsk State University, 2 Pirogova Street, Novosibirsk 630090, and Novosibirsk State Technical University, 20 Karl Marx Avenue, Novosibirsk 630092. MM-wave emission by magnetized plasma during sub-relativistic electron beam relaxation. United States: N. p., 2015. Web. doi:10.1063/1.4936874.
Ivanov, I. A., E-mail: Ivanov@inp.nsk.su, Arzhannikov, A. V., Burmasov, V. S., Popov, S. S., Postupaev, V. V., Sklyarov, V. F., Vyacheslavov, L. N., Novosibirsk State University, 2 Pirogova Street, Novosibirsk 630090, Burdakov, A. V., Sorokina, N. V., Novosibirsk State Technical University, 20 Karl Marx Avenue, Novosibirsk 630092, Gavrilenko, D. E., Kasatov, A. A., Kandaurov, I. V., Mekler, K. I., Rovenskikh, A. F., Trunev, Yu. A., Kurkuchekov, V. V., Kuznetsov, S. A., Polosatkin, S. V., Novosibirsk State University, 2 Pirogova Street, Novosibirsk 630090, & Novosibirsk State Technical University, 20 Karl Marx Avenue, Novosibirsk 630092. MM-wave emission by magnetized plasma during sub-relativistic electron beam relaxation. United States. doi:10.1063/1.4936874.
Ivanov, I. A., E-mail: Ivanov@inp.nsk.su, Arzhannikov, A. V., Burmasov, V. S., Popov, S. S., Postupaev, V. V., Sklyarov, V. F., Vyacheslavov, L. N., Novosibirsk State University, 2 Pirogova Street, Novosibirsk 630090, Burdakov, A. V., Sorokina, N. V., Novosibirsk State Technical University, 20 Karl Marx Avenue, Novosibirsk 630092, Gavrilenko, D. E., Kasatov, A. A., Kandaurov, I. V., Mekler, K. I., Rovenskikh, A. F., Trunev, Yu. A., Kurkuchekov, V. V., Kuznetsov, S. A., Polosatkin, S. V., Novosibirsk State University, 2 Pirogova Street, Novosibirsk 630090, and Novosibirsk State Technical University, 20 Karl Marx Avenue, Novosibirsk 630092. 2015. "MM-wave emission by magnetized plasma during sub-relativistic electron beam relaxation". United States. doi:10.1063/1.4936874.
@article{osti_22489921,
title = {MM-wave emission by magnetized plasma during sub-relativistic electron beam relaxation},
author = {Ivanov, I. A., E-mail: Ivanov@inp.nsk.su and Arzhannikov, A. V. and Burmasov, V. S. and Popov, S. S. and Postupaev, V. V. and Sklyarov, V. F. and Vyacheslavov, L. N. and Novosibirsk State University, 2 Pirogova Street, Novosibirsk 630090 and Burdakov, A. V. and Sorokina, N. V. and Novosibirsk State Technical University, 20 Karl Marx Avenue, Novosibirsk 630092 and Gavrilenko, D. E. and Kasatov, A. A. and Kandaurov, I. V. and Mekler, K. I. and Rovenskikh, A. F. and Trunev, Yu. A. and Kurkuchekov, V. V. and Kuznetsov, S. A. and Polosatkin, S. V. and Novosibirsk State University, 2 Pirogova Street, Novosibirsk 630090 and Novosibirsk State Technical University, 20 Karl Marx Avenue, Novosibirsk 630092},
abstractNote = {There are described electromagnetic spectra of radiation emitted by magnetized plasma during sub-relativistic electron beam in a double plasma frequency band. Experimental studies were performed at the multiple-mirror trap GOL-3. The electron beam had the following parameters: 70–110 keV for the electron energy, 1–10 MW for the beam power and 30–300 μs for its duration. The spectrum was measured in 75–230 GHz frequency band. The frequency of the emission follows variations in electron plasma density and magnetic field strength. The specific emission power on the length of the plasma column is estimated on the level 0.75 kW/cm.},
doi = {10.1063/1.4936874},
journal = {Physics of Plasmas},
number = 12,
volume = 22,
place = {United States},
year = 2015,
month =
}
  • A theory is derived for the relaxation of a relativistic electron beam interacting with oblique waves in a plasma in a strong magnetic field. As the beam current is raised, the nature of the instability changes: The instability resulting from the excitation of a nonresonant polarization field becomes dominant. A nonlinear theory is derived for the single-mode relaxation of a beam in an unbounded plasma and for steady-state amplification.
  • Microwave emissions are observed with a long time duration after a beam turn-off from a magnetized plasma that is heated by a high-intensity short-pulsewidth relativistic electron beam (500 keV, 2 kA, 3 ns). The emission has a frequency spectrum which has peaks near cyclotron harmonics (f=nf/subc//sube/, n=2, 3,...). These microwave emissions can be attributed to electrostatic waves excited by hot electrons which are created in the beam-plasma interaction. (AIP)
  • The paper presents results of measurements of sub-terahertz electromagnetic emission from magnetized plasma during injection of a powerful relativistic electron beam of microsecond duration in plasma with the density of 3 × 10{sup 14 }cm{sup −3}. It was found that the spectrum of the radiation concentrated in three distinct regions with high level of spectral power density. The first region is located near f{sub 1} = 100 GHz; the second one is in the vicinity of 190 GHz, and the third region is in the frequency interval f{sub 3} = 280–340 GHz. Polarization vectors of the emission in the first and third regions (f{sub 1} and f{sub 3}) are directedmore » mainly perpendicular to the magnetic field in the plasma. At the same time, the polarization of the radiation in the vicinity of f{sub 2} = 190 GHz is parallel to the magnetic field. The most likely mechanism of electromagnetic wave generation in the frequency regions f{sub 1} and f{sub 2} is the linear conversion of the plasma oscillations into the electromagnetic waves on strong gradients of the plasma density. The third region is situated in the vicinity of second harmonic of electron plasma frequency, and we explain this emission by the coalescence of the upper-hybrid oscillations at high level turbulence in plasma.« less
  • The magnetosonic wave emission by an intense relativistic electron beam rotating within a plasma is calculated. This process follows the trapping of the beam in the plasma, and results in a transfer of approximately half the beam energy to the plasma ions. A nonlinear theory is given in accord with beam and plasma parameters of fusion interest. It is shown that dissipation balances the nonlinearity to produce a shock-type flow resembling that of the linear theory. The primary nonlinear modification is an adjustment of the wave speed to v/sub s/=v/sub A/M/sub s/, where v/sup 2//sub A/ =B/sup 2//sub 0//4..pi..nm/sub i/more » and M/sub s/=1+B/B/sub 0/ is the mach number (B is the wave field, B/sub 0/ is the applied field). Estimates are made of power radiated to the waves and the resultant ion energies for some typical experimental parameters.« less
  • The surface plasma waves in a magnetized dusty plasma elliptical cylinder driven by elliptic relativistic electron beam propagating inside the elliptical cylinder are studied. The dispersion relation of surface plasma waves has been retrieved from the derived dispersion relation by considering that the beam is absent and there is no dust in the plasma cylinder. Mathematically, it is shown that the beam can interact with the surface plasma waves via Cerenkov interaction and fast cyclotron interaction. The growth rate and phase velocity in every cases are obtained. Finally, the numerical results and graphs are presented.