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Theoretical and experimental studies of the formation of a dense cloud of relativistic electrons at injection of the relativistic electron beam (REB) with a supercritical current into vacuum have been carried out in [1,2]. It has been pointed out that such a cloud of relativistic electrons produced in a plasma layer, may be used for collective ion acceleration [2,3]. Under the influence of the field...
In the paper the formation peculiarities of charged particle beams in high-voltage diode Vd = 20 ÷ 50 kV using the plasma bunch accelerated by the θ-pinch injector are considered in view of the utilization prospects of high-power ion beams tor plasma heating /1/.
Electrons can be confined in a “bumpy” torus so that they are effectively trapped by mirror magnetic fields and do not circulate around the torus. The electron space charge can be used to confine or focus a much smaller number of ions. Since the ion motion is non-adiabatic and only weakly dependent on the magnetic field, ions can be accelerated around the torus by a small toroidal electric field....
High current ion and electron beams are receiving increasing attention at present primarily because of their applications in fusion related studies. Thus they are used in neutral beam heating [1] in magnetic cinfinement fusion machines. Particle beams are also of interest in plasma-wall interaction studies [2] in fusion devices. They also have potential applications in laser excitation) [3], microwave...
The injection of relativistic electron beams into a magnetic cusp through the ring cusp has previously been investigated at a power level of 1010 watts.1 Energy was transferred from a ring-shaped beam inside the diode to a target in the zero-field region of the cusp with a maximum efficiency of 30%.
An intense relativistic-electron beam ring of the current above 30 kA was used to confine a hot plasma. The ring was formed in a toroidal device SPAC-V by a pulse injection of e-beam, using the plasma-anode method. Induced return currents of the plasma affected the ring formation. The lifetime of the ring reached 1.6 ms during which time evolutions of several parameters like the poloidal βp were studied.
The REBEX machine permitted us to compare the efficiency of plasma heating in propagating (REB) and oscillating (OREB) beam regimes. The propagating beam energy loss decreases with increasing the plasma density. The best transport (85%) was achieved at the highest plasma density (1020m−3). Plasma heating is completely due to the two-stream instability in this regime.
It was theoretically shown [1–3] that during a collective electron beam-plasma interaction, HF - oscillations may develop in a plasma at a frequency Wp; the beam energy taken away to initiate these oscillations may be very high. Since high-current relativistic electron beams (REB) seem to be the most energetic,it would be reasonable to use them in order to obtain highly intensive HF-oscillations,...
As stated previously the Cornell slow space charge wave accelerator study has now reached the point where all of the required elements to test the scientific feasibility have been tested, albeit not simultaneously for each of the required parameters. The recent results on the soliton wave velocity are especially encouraging in that they suggest there may be that a substantial relaxation in the requirements...
The first part of this paper is devoted to the problems of intense ion beam generation in reflex diode systems and the second part-to the subject of collective ion acceleration in the Ii near electron beams (REBs), drifting in the neutral gas. All datas were taken on two pulsers: 1 MV, 20ohm, 50 ns and 400 kV, 7 ohm, 80 ns.
Rotating relativistic electron beams have been the subject of a number of experimental and theoretical studies,1 principally concerned with the use of such beams for heating plasmas. The rotating beams are usually created by passing a hollow cylindrical beam through a non-adiabatic magnetic cusp,2 and are propagated down an axial guide field into either plasma or neutral gas.
One of the most perspective trends of high-current electronics development is the creation of electron beam accelerators with high pulse recurrence frequency [l]. The prospect of this trend is due not only to the possibility of these accelerators to be widely used in physical researches but to their possibility to be used in solution of various problems of applied character. This paper deals with...
The developement of high-current accelerators is essentially dependent on the progress in elaborating powerful energy storage systems with high specific parameters and on the perfection of energy concentration methods in time and spase. In this respect the use of electrically exploding conducters in accelerator technique for high voltage pulses formation is of interest /1,2/.
A model four-stage blumlein line was constructed and was simultaneously switched with reflected shock waves. A quadruple voltage pulse for an unloaded line was obtained with this method. A scale up of our apparatus seems to have a wide range of application in the plasma physics and the controled thermonuclear fusion researches. To the best of our knowledge this is the first time that the method of...
Inertial confinement fusion (ICF) reactors will require driver systems operating with tens to hundreds of megawatts of average power. The pulse power technology that will be required to build such drivers is in a primitive state of developement. Recent developments In repetitive pulse power are discussed. A high-voltage transformer has been developed and operated at 3 MV in a single pulse experiment...
We report in this paper the detailed measurements carried out on the high energy ion beam (Ed > 350 KV) generated in the Frascati 1 MJ device operated 250 kJ 20 kV. It is shown, for two geometries of the electrodes, that the low pressure filling favours beam generation but that the efficiency is very low (∼ 1%). The existence of streams of medium energy (50 – 350 keV) is inferred from the neutronic...
At the High-Current Institute a pulse electron-beam accelerator with water dielectric is performed. The machine operates simultaneously with the diagnostic system which is intended for study of plasma processes accompanying the beam focusing in diode. The accelerator is operated at a voltage level of 500–700 kV, peak current is 250–330 kA and pulse duration is 70 ns at the matched regime.
At present electrical capacitors are used practically in all operating and now being constructed high current pulse electron accelerators as a basic energy storage and due to their small specific energy parameters they determine size8 weight and cost of the accelerator [1].
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