scholarly journals Study of a non-intrusive electron beam radius diagnostic

1997 ◽  
Author(s):  
T.J.T. Kwan ◽  
B.G. DeVolder ◽  
J.C. Goldstein ◽  
C.M. Snell
Keyword(s):  
Electron Beam ◽  
Beam Radius

scholarly journals Transient fields produced by a cylindrical electron beam flowing through a plasma

2012 ◽  
Vol 30 (3) ◽  
pp. 497-507
Author(s):  
Marie-Christine Firpo
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Laplace Transform ◽  
Control Parameter ◽  
Bessel Functions ◽  
Skin Depth ◽  
The Other ◽  
Beam Radius ◽  
Equilibrium Situation ◽  
Detailed Computation

AbstractThe out-of-equilibrium situation in which an initially sharp-edged cylindrical electron beam, that could, e.g., model electrons flowing within a wire, is injected into a plasma is considered. A detailed computation of the subsequently produced magnetic field is presented. The control parameter of the problem is shown to be the ratio of the beam radius to the electron skin depth. Two alternative ways to address analytically the problem are considered: one uses the usual Laplace transform approach, the other one involves Riemann's method in which causality conditions manifest through some integrals of triple products of Bessel functions.

EARLY OUT-OF-EQUILIBRIUM BEAM-PLASMA EVOLUTION: POSSIBLE FORMATION OF A BEAM RING STRUCTURE

2007 ◽  
Vol 21 (03n04) ◽  
pp. 633-636 ◽  
Author(s):  
M. C. FIRPO ◽  
A. F. LIFSCHITZ
Keyword(s):  
Electron Beam ◽  
Transverse Isotropy ◽  
Ring Structure ◽  
Skin Depth ◽  
Beam Radius ◽  
Particle In Cell ◽  
Beam Plasma ◽  
Initial Stage ◽  
Filamentation Instability ◽  
Beam Edge

We solve analytically the out-of-equilibrium initial stage that follows the injection of a radially finite electron beam into a plasma at rest and test it against particle-in-cell simulations. For initial large beam edge gradients and not too large beam radius, compared to the electron skin depth, the electron beam is shown to evolve into a ring structure. For low enough transverse temperatures, filamentation instability eventually proceeds and saturates when transverse isotropy is reached. The analysis accounts for the variety of very recent experimental beam transverse observations.

scholarly journals Study of a non-intrusive electron beam radius diagnostic

2002 ◽  
Author(s):  
T.J.T. Kwan ◽  
B.G. DeVolder ◽  
J.C. Goldstein ◽  
C.M. Snell
Keyword(s):  
Electron Beam ◽  
Beam Radius

Intense electron-beam radius-tailoring experiment

1992 ◽  
Author(s):  
Daniel J. Weidman ◽  
M. J. Rhee ◽  
Ralph F. Schneider ◽  
K. T. Nguyen ◽  
Robert A. Stark
Keyword(s):  
Electron Beam ◽  
Beam Radius ◽  
Intense Electron Beam ◽  
Intense Electron

Excitation of whistlers and quasi-static modes by an annular electron beam in a plasma cylinder

1988 ◽  
Vol 39 (3) ◽  
pp. 407-411 ◽  
Author(s):  
I. Talukdar ◽  
V. K. Jain
Keyword(s):  
Growth Rate ◽  
Electron Beam ◽  
Local Theory ◽  
Beam Radius ◽  
Plasma Cylinder ◽  
Static Mode ◽  
Weak Beam ◽  
Annular Electron Beam ◽  
Beam Velocity ◽  
Slow Cyclotron

A non-local theory of whistler and quasi-static mode excitation by an annular electron beam in a plasma cylinder is presented. Čerenkov and slow-cyclotron interaction are considered in the weak-beam approximation. The growth rate is found to be quite sensitive to the beam radius except in the case of slow-cyclotron interaction of quasi-static modes. The growth rate varies significantly with beam velocity in the case of Čerenkov interaction of quasi-static modes, but in other cases it is rather insensitive to the beam velocity.

Electron Beam Radius Tailoring And Diagnostics

2005 ◽  
Author(s):  
D.J. Weidman ◽  
J.D. Miller ◽  
M.J. Rhee ◽  
R.F. Schneider ◽  
K.T. Nguyen ◽  
...  
Keyword(s):  
Electron Beam ◽  
Beam Radius

scholarly journals Efficiency Enhancement in a Tapered Free Electron Laser by Varying the Electron Beam Radius

2012 ◽  
Author(s):  
Yi Jiao ◽  
J. Wu ◽  
Y. Cai ◽  
A.W. Chao ◽  
W.M. Fawley ◽  
...  
Keyword(s):  
Electron Beam ◽  
Free Electron ◽  
Free Electron Laser ◽  
Beam Radius ◽  
Efficiency Enhancement

Results from the electron-beam radius-tailoring experiment with a fast focusing coil

2005 ◽  
Author(s):  
D.J. Weidman ◽  
M.J. Rhee ◽  
R.F. Schneider ◽  
K.T. Nguyen ◽  
R.A. Stark
Keyword(s):  
Electron Beam ◽  
Beam Radius

scholarly journals Influence of beam radius on deposition parameters in dielectric under high energy electron irradiation

2018 ◽  
Vol 189 ◽  
pp. 09001 ◽  
Author(s):  
Yinghong Zuo ◽  
Yuan Wei ◽  
Jinhui Zhu
Keyword(s):  
Electron Beam ◽  
Charge Density ◽  
Dose Rate ◽  
Electron Irradiation ◽  
Dielectric Layer ◽  
High Energy ◽  
Beam Radius ◽  
Beam Source ◽  
Deposition Parameters ◽  
Injection Current Density

To study the influence of the electron beam radius on the deposition parameters in dielectric under high energy electron irradiation, a model of dielectric irradiated by plane electron beam source was established. Monte Carlo simulation method was used to calculate the distribution of the injection current density, injection charge density, dose rate and radiation induced conductivity in the dielectric layer of Teflon after electron irradiation with different energies and different beam radii. The results show that the radius of the electron beam source has little influence on the distribution trend of the injection current density in the dielectric layer, as well as the peak position of the injection charge density and the dose rate, but it will significantly affect the peak value of injection charge density and the dose rate. When the electron beam radius is smaller than the dielectric layer radius, the calculated peak is higher than that of the electron beam completely covering the dielectric layer. The higher the electron energy is, the greater the relative deviation will be.

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