scholarly journals Умеренно релятивистский генератор микроволнового излучения субгигаваттного уровня типа твистрон с эффективностью 50%

2019 ◽  
Vol 45 (6) ◽  
pp. 47
Author(s):  
Е.М. Тотьменинов ◽  
С.А. Кицанов ◽  
А.И. Климов ◽  
А.Н. Синяков
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Power Conversion ◽  
Wave Interaction ◽  
Beam Current ◽  
Beam Power ◽  
Electron Wave ◽  
Microwave Generation ◽  
Beam Parameters ◽  
Diode Voltage

AbstractA regime of quasi-stationary microwave generation in moderately relativistic microwave oscillator of the twistron type with 50 ± 20% efficiency of electron beam power conversion into electromagnetic radiation has been obtained in experiment through optimization of the electron–wave interaction. For the selected electron beam parameters (diode voltage, 210 kV; beam current. 1.36 kA) the output microwave power at 10.63 GHz frequency was 140 ± 40 MW in a guiding magnetic field of about 1.9 T. The duration of microwave pulses was about 16 ns.

scholarly journals Динамическое управление мощностью мегаваттного электронного пучка субмиллисекудной длительности в источнике с плазменным катодом

2021 ◽  
Vol 47 (10) ◽  
pp. 38
Author(s):  
М.С. Воробьёв ◽  
П.В. Москвин ◽  
В.И. Шин ◽  
Н.Н. Коваль ◽  
К.Т. Ашурова ◽  
...  
Keyword(s):  
Electron Beam ◽  
Beam Energy ◽  
Maximum Rate ◽  
Control Method ◽  
Beam Current ◽  
Rate Of Change ◽  
Beam Power ◽  
Metallic Materials ◽  
Plasma Cathode ◽  
Variable Power

The paper describes a method for a controlled change in the power of an electron beam during a pulse of submillisecond duration, using a source "SOLO" with a plasma cathode. The beam power is controlled by changing the amplitude of the beam current with a corresponding change in the concentration of the emission plasma. This control method allows generating submillisecond beams of variable power (up to 10 MW at a maximum rate of change of no more than 0.5 MW/µs), which can be used for processing various metallic materials in order to change the functional properties of their surface with the ability to control the rate of input of beam energy into the surface of these materials.

scholarly journals Surface treatment by the ion flow from electron beam generated plasma in the forevacuum pressure range

2018 ◽  
Vol 143 ◽  
pp. 03008 ◽  
Author(s):  
Aleksandr Klimov ◽  
Aleksey Zenin
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Pressure Range ◽  
Alumina Ceramics ◽  
Ion Energy ◽  
Ion Flow ◽  
Beam Plasma ◽  
Flow Formation ◽  
Beam Parameters ◽  
Current Energy

The paper presents research results of peculiarities of gas ion flows usage and their generation from large plasma formation (>50 sq.cm) obtained by electron beam ionization of gas in the forevacuum pressure range. An upgraded source was used for electron beam generation, which allowed obtaining ribbon electron beam with no transmitting magnetic field. Absence of magnetic field in the area of ion flow formation enables to obtain directed ion flows without distorting their trajectories. In this case, independent control of current and ion energy is possible. The influence of electron beam parameters on the parameters of beam plasma and ion flow – current energy and density – was determined. The results of alumina ceramics treatment with a beam plasma ions flow are given.

scholarly journals HIGH-CURRENT RELATIVISTIC ELECTRON BEAM FOCUSING IN PLASMA

2021 ◽  
pp. 30-34
Author(s):  
О.V. Manuilenko ◽  
A.V. Pashchenko ◽  
V.G. Svichensky ◽  
B.V. Zajtsev
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
External Magnetic Field ◽  
Relativistic Electron ◽  
Relativistic Electron Beam ◽  
Beam Current ◽  
High Current ◽  
Plasma Parameters ◽  
Beam Focusing ◽  
Envelope Equation

The analysis of the envelope equation for high-current relativistic electron beam propagation in plasma in an external uniform magnetic field is presented. The envelope equation is obtained in a Hamiltonian form with an effective potential, which depends from electron beam and plasma parameters, and external magnetic field. Hamiltonian aproach allows fully analyze the behavior of the beam envelope as a function of the beam current, beam energy, plasma density and conductivity, as well as on the external magnetic field and the initial beam angular momentum.

scholarly journals Low-Energy State Electron Beam in a Uniform Channel

Plasma ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 222-228 ◽  
Author(s):  
Mikhail Fuks ◽  
Dmitrii Andreev ◽  
Artem Kuskov ◽  
Edl Schamiloglu
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Space Charge ◽  
Virtual Cathode ◽  
Energy State ◽  
Beam Current ◽  
Low Energy ◽  
Magnetic Mirror ◽  
Limiting Current ◽  
Uniform Channel

In our earlier work, we showed that a low-energy state of an electron beam exists in a nonuniform channel between two virtual cathodes in a magnetron with diffraction output, which consists of three uniform sections with increasing radius. A uniform axial magnetic field fills the interaction space. This led to magnetron operation with >90% efficiency when combined with a magnetic mirror field at the output end. In this present paper, we show that a low-energy state of an electron beam can be realized in a uniform channel in which an increasing magnetic field is used in order to create a magnetic mirror at the output end. We consider two cases, one where the injected beam current slightly exceeds the space-charge-limiting current and the other where the injected beam current greatly exceeds the space-charge-limiting current. On the time scale of relevance to planned experiments (∼30 ns), when the injected current slightly exceeds the space-charge-limiting current a stationary virtual cathode forms and when the injected current greatly exceeds the space-charge-limiting current the virtual cathode oscillates back and forth.

A novel self-injection relativistic backward wave oscillator

2021 ◽  
Author(s):  
Zhiqiang Fan ◽  
Jun Sun ◽  
Yibing Cao ◽  
Zhimin Song ◽  
Yanchao Shi ◽  
...  
Keyword(s):  
Electron Beam ◽  
Conversion Efficiency ◽  
Dominant Role ◽  
Wave Interaction ◽  
Operating Mode ◽  
Beam Current ◽  
Frequency Locking ◽  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Backward Wave

Abstract A novel self-injection relativistic backward wave oscillator (RBWO) has been proposed. By introducing a self-injection path into the RBWO, a small portion of the energy in the reflector can be coupled to the upstream of the reflector, and then the formed electric field in the self-injection path region can pre-modulate the passing electron beam, to promote a frequency-locking oscillation of the electron beam. The pre-modulated electron beam can be expected to enhance the beam-wave interaction and suppress parasitic mode oscillation, which is beneficial for maintaining the dominant role of the operating mode. The proposed self-injection RBWO shows great potential for improving the conversion efficiency and pulse duration time. Through particle-in-cell simulation, a microwave with a power of 10.6 GW is obtained, when the beam voltage is 1.08 MeV, and the beam current is 18.6 kA. The conversion efficiency is 53%.

Super-ion-beam accelerator for the ignition of thermonuclear reactions

1980 ◽  
Vol 24 (1) ◽  
pp. 1-14 ◽  
Author(s):  
F. Winterberg
Keyword(s):  
Magnetic Field ◽  
Ion Beam ◽  
Beam Current ◽  
Ion Beams ◽  
Beam Power ◽  
Thermonuclear Reactions ◽  
Beam Voltage ◽  
Multi Stage ◽  
Light Ions ◽  
Thermonuclear Target

A pulsed, multi-stage, high-voltage accelerator is proposed which should be capable of producing intense ion beams of many million amperes and many million volts. Super ion beams produced by this type of accelerator can exceed the limiting Aifvén current for light ions, typically 107 A, at which beam pinching occurs. The beam pinching of these super-beams permits them to be precisely focused onto a thermonuclear target. With such an accelerator it seems to be possible to reach a beam voltage of 108 V with a beam current of 107 A. The resulting beam power of 1015 W should be more than sufficient to ignite a DT thermonuclear microexplosion. By the formation of a stable ion beam superpinch within a thermonuclear target, such a large beam power in conjunction with the strong self-magnetic field of the beam may even lead to the ignition of the DD and perhaps HB11 thermonuclear reactions.

Investigation of Spiking in Electron Beam Welding Using Stationary Stochastic Models

1977 ◽  
Vol 99 (2) ◽  
pp. 323-326 ◽  
Author(s):  
M. S. Phadke ◽  
A. M. Joglekar ◽  
S. M. Wu
Keyword(s):  
Electron Beam ◽  
Regression Models ◽  
Electron Beam Welding ◽  
Mechanistic Model ◽  
Beam Current ◽  
Heat Energy ◽  
Random Fluctuation ◽  
Beam Power ◽  
Model Parameters ◽  
Order Continuous

The spiking phenomenon in electron beam welding is characterized using the second-order continuous autoregressive model. The model parameters are then physically interpreted in terms of the random fluctuation in the beam power and the diffusion of heat energy in the plates being welded; and a mechanistic model is proposed for the spiking phenomenon. Finally, regression models are obtained to relate the spiking behavior to the accelerating voltage, the beam current, and the welding speed.

scholarly journals A spiral strip transformer type electron-beam accelerator

2006 ◽  
Vol 24 (3) ◽  
pp. 355-358 ◽  
Author(s):  
JINLIANG LIU ◽  
CHUANLU LI ◽  
JIANDE ZHANG ◽  
SHIZHONG LI ◽  
XINXIN WANG
Keyword(s):  
Electron Beam ◽  
Pulse Duration ◽  
Field Emission ◽  
Beam Current ◽  
Storage Capacitor ◽  
Electron Beam Current ◽  
Air Core ◽  
Transformer Type ◽  
Blumlein Line ◽  
Diode Voltage

An electron-beam accelerator, which consists of a primary storage capacitor system, an air core spiral strip transformer, water Blumlein line of water dielectric, and a field-emission diode, is described. The experimental results show that the diode voltage is more than 400 kV, electron beam current is about 40 kA, and the pulse duration is more than 80 ns. This accelerator is very compact and works stably and reliably.

PERFORMANCE OF PMMA FOR NANODOT PATTERNING USING ELECTRON BEAM LITHOGRAPHY

2005 ◽  
Vol 04 (04) ◽  
pp. 587-589
Author(s):  
T. V. NARAYANAN ◽  
SOHAN SINGH ◽  
HENDRIX TANOTO ◽  
MY THE ◽  
SOON FATT YOON
Keyword(s):  
Electron Beam ◽  
Quantum Dot ◽  
Electron Beam Lithography ◽  
Beam Current ◽  
Scattering Effects ◽  
Beam Parameters

The performance of a positive tone resist, PMMA, for sub 100 nm patterning of nano-dots using electron beam lithography is to be studied. This optimization is done on a JEOL JBX-6000 FS System. The various parameters such as beam current, resist thickness, dose and electron energies are optimized. This patterning involves greater control over beam parameters so as to reduce aberrations that might arise due to astigmatism. In this respect, the optimization of the beam current parameters is very important, as a narrower beam will minimize scattering effects. These structures will be particularly significant for the fabrication of quantum dot based devices. Nano-dot arrays of dimensions 70 nm with equal spacings of 70 nm were obtained at 100 pA beam current at 50 KeV for a dose of 170 μC/cm2.

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