scholarly journals Transformer Ratio at Wakefield Excitation by Train of Electron Bunches with Linear Growth of Current in Dielectric Resonator Electron–Positron Collider

2020 ◽  
Vol 1596 ◽  
pp. 012056
Author(s):  
V Maslov ◽  
D Bondar ◽  
I Onishchenko ◽  
V Papkovich
Keyword(s):  
Dielectric Resonator ◽  
Linear Growth ◽  
Electron Bunches ◽  
Electron Positron ◽  
Transformer Ratio

scholarly journals EFFECT OF TRANSITION RADIATION AND DISPERSION SPREADING AT ACHIEVEMENT OF A LARGE TRANSFORMER RATIO OF DRIVER-BUNCH ENERGY INTO WAKEFIELD IN A DIELECTRIC RESONATOR ACCELERATOR

2019 ◽  
pp. 48-54
Author(s):  
V.I. Maslov ◽  
D.S. Bondar ◽  
I.N. Onishchenko ◽  
V.G. Papkovich
Keyword(s):  
Numerical Simulation ◽  
Group Velocity ◽  
Dielectric Resonator ◽  
Transition Radiation ◽  
Wavelength Interval ◽  
Beam Electron ◽  
Electron Positron ◽  
Transformer Ratio

Possibility of increase of transformer ratio TR in the case of the profiled sequence of bunches at their injection in a two-beam electron-positron dielectric-resonator collider is considered. Unlike considered earlier the waveguide case, for which TR is equal to the doubled number of bunches of sequence which provide a contribution to the total wakefield, and which is limited by the effect of the group velocity, in a resonator this limitation is absent. For derivation in the case of resonator of TR, proportional to the number of bunches, as well as in the waveguide, the ratio of bunch charges is selected to be equal 1:3:5: … , lengths of bunches, equal to the half of wavelength, interval between bunches is multiple to the wavelength. The effect of transition radiation and dispersion spreading on the transformer ratio is studied by numerical simulation.

scholarly journals INCREASE OF EFFICIENCY OF ACCELERATION OF THE TEST ELECTRON BUNCH BY SEQUENCE OF ELECTRON BUNCHES IN THE RECTANGULAR DIELECTRIC RESONATOR AT PLASMA FILLING

2019 ◽  
pp. 53-57
Author(s):  
P.I. Markov ◽  
I.N. Onishchenko ◽  
G.V. Sotnikov
Keyword(s):  
Numerical Simulation ◽  
Electric Field ◽  
Relativistic Electron ◽  
Plasma Density ◽  
Dielectric Resonator ◽  
Electron Bunch ◽  
Linear Growth ◽  
Energy Gain ◽  
Electron Bunches ◽  
Test Electron

A result of numerical simulation of acceleration of the test electron bunch following a sequence of relativistic electron bunches in the rectangular dielectric resonator when filling the drift channel with plasma of different density is provided. We have found out that at change of plasma density the linear growth of energy gain of test bunch electrons is observed. It is connected with structure ordering of longitudinal accelerating electric field in the resonator and also with increase in its amplitude. It is due to that at periodic injection of drive bunches on resonator axis the areas with the increased plasma electrons density are formed.

scholarly journals WAKEFIELDS AND DRIVE ELECTRON BUNCHES DYNAMICS IN THREE-ZONE DIELECTRIC RESONATOR AT ASYMMETRICAL INJECTION

2019 ◽  
pp. 58-62
Author(s):  
K.V. Galaydych ◽  
R.R. Kniaziev ◽  
G.A. Krivonosov ◽  
I.N. Onishchenko ◽  
G.V. Sotnikov
Keyword(s):  
Spatial Distribution ◽  
Relativistic Electron ◽  
Dielectric Resonator ◽  
Numerical Study ◽  
Particle Dynamics ◽  
Axial Injection ◽  
Electron Bunches

A numerical study of the wakefield excitation in a rectangular dielectric-loaded resonator by a sequence of relativistic electron bunches in the case of non-axial injection is carried out. The effect of the shift of injected bunches on the particle dynamics, as well as on the spatial distribution of the components of the bunch-excited fields, is studied. The current losses of a sequence of relativistic electron bunches due to the particles deposition on the surface of the dielectric is determined.

scholarly journals Uniform Focusing of Sequence of Relativistic Positron Bunches in Plasma

2019 ◽  
Keyword(s):  
Radial Direction ◽  
Wave Length ◽  
Longitudinal Direction ◽  
Radial Force ◽  
The Self ◽  
Cold Electron ◽  
Hydrodynamic Description ◽  
Electron Bunches ◽  
Electron Positron ◽  
Self Consistent

Plasma-based accelerators sustain accelerating gradients which are several orders greater than obtained in conventional accelerators. Focusing of electron and positron beams by wakefield, excited in plasma, in electron-positron collider is very important. The focusing mechanism in the plasma, in which all electron bunches of a sequence are focused identically, has been proposed by authors earlier. The mechanism of focusing of a sequence of relativistic positron bunches in plasma, in which all positron bunches of sequence are focused identically and uniformly, has been investigated in this paper by numerical simulation by 2.5D code LCODE. Mechanism of this identical and uniform focusing involves the use of wave-length λ, which coinciding with double longitudinal dimension of bunches λ=2Db, the first bunch current is in two times smaller than the current of the following bunches of sequence and the distance between bunches equals to one and a half of wavelength 1.5λ. We numerically simulate the self-consistent radial dynamics of lengthy positron bunches in homogeneous plasma. In simulation we use the hydrodynamic description of plasma. In other words the plasma is considered to be cold electron liquid, and positron bunches are aggregate of macroparticles. Positron bunches are considered to be homogeneous cylinders in the longitudinal direction. Positrons in bunches are distributed in radial direction according to Gaussian distribution. It is shown that in this case only first bunch is in the finite longitudinal electrical wakefield Ez¹0. Other bunches are in zero longitudinal electrical wakefield Ez=0. Between bunches of this sequence longitudinal electrical wakefield and radial force are not zero Ez¹0, Fr¹0. The focusing radial force in regions, occupied by bunches, is constant along each bunch Fr=const. Between bunches the radial force is inhomogeneous Fr¹const. All positron bunches of sequence are focused identically and uniformly.

Simulations of a High-Transformer-Ratio Plasma Wakefield Accelerator Using Multiple Electron Bunches

2009 ◽  
Author(s):  
Efthymios Kallos ◽  
Patric Muggli ◽  
Thomas Katsouleas ◽  
Vitaly Yakimenko ◽  
Jangho Park ◽  
...  
Keyword(s):  
Electron Bunches ◽  
Plasma Wakefield Accelerator ◽  
Transformer Ratio ◽  
Plasma Wakefield ◽  
Wakefield Accelerator

Excitation of wake fields by lengthy electron bunches in a dielectric resonator

2009 ◽  
Vol 54 (10) ◽  
pp. 1194-1200
Author(s):  
K. V. Galaydych ◽  
P. I. Markov ◽  
G. V. Sotnikov
Keyword(s):  
Dielectric Resonator ◽  
Electron Bunches ◽  
Wake Fields

Wake field in electron–positron plasmas

1993 ◽  
Vol 50 (1) ◽  
pp. 79-84 ◽  
Author(s):  
K. Avinash ◽  
V. I. Berezhiani
Keyword(s):  
Quantitative Estimation ◽  
Galactic Nuclei ◽  
Pulsar Magnetosphere ◽  
Plasma Inhomogeneity ◽  
Pulsar Radio ◽  
Wake Field ◽  
Electron Bunches ◽  
Electron Positron ◽  
Photon Acceleration ◽  
Photon Motion

SummaryWe have studied the possibility of exciting a wake field in an electron–positron plasma by the injection of relativistic electron bunches. We have investigated the change in frequency of electronmagnetic radiation propagating through the resulting inhomogeneity. Our main conclusion is that it is not necessary to invoke a magnetic field in order to excite a wake field in an electron–positron plasma. As shown here, the necessary charge separation could come from the injection of energetic particle bunches. This mechanism of wake-field creation and subsequent particle/photon acceleration could operate in a pulsar magnetosphere, where particle bunches are extracted energetically from the pulsar surface. For example, pulsar radio emissions exhibit ultra-short intensity variations within individual pulses with time scales ranging from 1 μs to 1 ms (Cordes 1979). Several authors have proposed (Chian & Kennel 1983; Mofiz, De Angelis & Forlani 1985; Mikhailovskii, Onishchenko & Tatarinov 1985) that these pulsations can be explained as being due to soliton formation in the pulsar magnetosphere.We believe that these micropulsations can also be explained by modulation of the radiation caused by the wake field. In order to have a quantitative estimation, we need to take into account the effects of thermal motion of particles as well as plasma inhomogeneity, etc. The present results should also be useful for understanding nonolinear photon motion in cosmic plasmas, such as those found in the early universe and in active galactic nuclei (Tajima & Taniuti 1990).

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