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The specific power density 1 kW/cm3 of sub-THz-wave emission from plasma in the multi-mirror trap GOL-3 during injection of 0.5 MV, 2 kA/cm2 10-ms-relativistic electron beam (REB) at plasma densities ne ≈ (1−6)·1014 cm−3, electron temperatures Te ≈ 1 keV and magnetic field B ≈ 4 T was measured in the frequency band 200–500 GHz.
Summary form only given. 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/cm2, pulse duration about 10 ms, total energy of the beam pulse -150...
In experiments at ELMI-device (BINP, Novosibirsk) the operation of 4-mm free electron maser (FEM) with two dimensional distributed feedback was demonstrated. These results gave a base for development multichannel planar FEM with 2-D distributed feedback. In case of two channels jointed by special waveguide 2-D distributed feedback can be also used for two stage generation of submillimeter radiation...
Experimental and theoretical investigations on simultaneous generation and transport of two microsecond E-beams with an electron energy of 0.8 MeV and beam currents of up to 3 kA at a high current density of ~1-1.5 kA/cm2 are described in this paper. Peculiarities of using such beams for a generation of millimeter and submillimeter radiation in a free-electron maser are discussed. Parameters of the...
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/cm2, pulse duration 9 mus, total energy of the beam pulse ~150 kJ. Due to the high level of the...
Experimental and theoretical investigations on simultaneous generation and transport of two microsecond E-beams with the electron energy 0.8MeV, beam currents up to 3kA at a high current density ∼1–1.5kA/cm2 are described in the paper. Peculiarities of using such beams for a generation of mm and submm radiation in free electron maser are discussed. Parameters of the beams suitable for these applications...
To analyze fusion prospects of E-beam heating the plasma in multimirror trap, the beam generator U-2 at the GOL-3 facility was modified for prolongation of 9µs beam pulse. Energy transfer from the beam to plasma column was investigated on the base of measurements of the energy distribution functions both plasma electrons (Thomson scattering of Nd-glass laser light) and beam electrons (multifoil analyzer)...
Paper describes main features of a project of an experiment at ELMI-device on two-stage generation of submillimeter radiation pulses. In this experiment two parallel high current sheet beams will be used. Submillimeter waves generation is based on stimulated scattering of mm-waves accumulated in the resonator of a planar FEM-oscillator driven by one of these beams.
This paper describes main features of a project on two- stage generation of submillimeter radiation pulses at ELMI-device. In this project one sheet beam will drive 2D Bragg planar FEM in which intensive 4-mm radiation accumulated in the FEM resonator, is used for stimulated scattering on the another sheet beam.
Summary form only given. Essential progress has been achieved on GOL-3 experimental facility (Novosibirsk) in recent years. Deuterium plasma with density 1015 cm-3 is heated by relativistic electron beam up to temperatures in order of 2 keV, both for electron and ion plasma components. Neutron output has been obtained for the plasma. The paper presents one possible way to increase neutron output....
Recent results of experiments on high-energy content E-beam application for plasma heating in a multimirror trap GOL-3 are presented. Conditions for optimal neutralization of injected beam and its stable transport through long plasma column are defined. Effective electron and ion heating of plasma is observed.
Method of space-resolving calorimetry of a high-power electron beam has been developed. Picture of thermal radiation from front surface of the beam receiver is taken by absolutely calibrated CCD detector in visible and near IR range and then transformed into spatial distribution of the beam energy deposition into target. The method is particulary useful under high loads (∼1 kJ/cm2 energy density),...
For the electron beams in a guiding magnetic field with significant energy and angular spreads of the particles two novel schemes of recuperator with different configurations are described. In the first one a special combination of transversal and longitudinal magnetic fields is used to separate electrons due to different Larmour radii corresponded to different energy of their longitudinal motion...
New method of intense relativistic electron beam modulation at frequencies up to ∼1 GHz is suggested. Current modulation is provided by using the azimuthal magnetic field of the beam to control the beam reflection from the magnetic mirror. The results of computer simulation for 2 MeV, 20–50 kA beam are presented.
Now all these generators are in the operation: 1. The U-1 generator is being in operation since 1980 and produces REB with the following parameters: electron energy W ≃ 1.1 MeV, maximum current I ≃ 50 kA, energy content Q ≃ 140 kJ, pulse duration τ ≃ 5 − 7 µs. In the focused beam the current density is up to 6 kA/cm2 and Q ≃ 110 kJ. Over 2500 shots have been made. 2. The U-2 generator is being in...
One of the promising ways to heat plasma in the open solenoidal systems as GOL-3 device1), is to use relativistic electron beams with a ribbon cross section2). These beams should be generated in the foilless ribbon diodes which can produce at 1 MV voltage the electron current about 50–100 kA with pulse duration at least 10µs2. The electron beam generated in this diode may have a small angular spread...
The studies on the microsecond ribbon REB generation and transport were carried out at the beam energy about 50 kJ. Conditions of the ribbon beam transport at a stabilized equilibrium were established. The transformation of the beam cross section from the ribbon shape to the circular one was realized. The obtained experimental results give the base of the full scale ribbon beam experiment at its energy...
The experience of design, operation and application of the high-voltage generators for the microsecond REB production with energy content of over 100 kJ is summarized. The variants of capacity storages designed according to the LC-generator scheme and been charged by 1 MV d.c. voltage are described.
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