Nonlinear radiation by an electron beam in the whistler range: A tentative theoretical model

1982 ◽  
Vol 25 (6) ◽  
pp. 1073 ◽  
Author(s):  
J. Lavergnat
Keyword(s):  
Electron Beam ◽  
Theoretical Model ◽  
Nonlinear Radiation

Light angular distribution and modulation transfer function of a fluorescent screen excited by an electron beam

1979 ◽  
Vol 57 (12) ◽  
pp. 2190-2193 ◽  
Author(s):  
G. E. Giakoumakis ◽  
C. D. Nomicos ◽  
P. C. Euthymiou
Keyword(s):  
Electron Beam ◽  
Angular Distribution ◽  
Theoretical Model ◽  
Transfer Function ◽  
Modulation Transfer Function ◽  
Experimental Results ◽  
Modulation Transfer ◽  
Grain Sizes ◽  
Phosphor Screen ◽  
Fluorescent Screen

The angular distribution of the light emitted from a ZnCdS(Ag) phosphor screen excited by an electron beam is measured for different thicknesses of the screen and for two grain sizes. This angular distribution is found to have a divergence from the Lambert law. A theoretical model is proposed leading to an equation fitting to the experimental results. Using this equation the modulation transfer function (MTF) of the screen was calculated.

An electromagnetic gamma-ray free electron laser

2013 ◽  
Vol 79 (6) ◽  
pp. 995-998 ◽  
Author(s):  
BENGT ELIASSON ◽  
CHUAN SHENG LIU
Keyword(s):  
Electron Beam ◽  
Theoretical Model ◽  
Gamma Rays ◽  
Free Electron ◽  
Free Electron Laser ◽  
Gamma Ray ◽  
High Energy ◽  
X Rays ◽  
High Energy Electron ◽  
Coherent Light

AbstractWe present a theoretical model for the generation of coherent gamma rays by a free electron laser, where a high-energy electron beam interacts with an electromagnetic wiggler. By replacing the static undulator with a 1-μm laser wiggler, the resulting radiation would go from X-rays currently observed in experiments, to gamma rays. Coherent light in the gamma-ray range would have wide-ranging applications in the probing of matter on sub-atomic scales.

Influence of ion density on electron-beam propagation from a gas-filled diode

1999 ◽  
Vol 61 (1) ◽  
pp. 31-41 ◽  
Author(s):  
HAN S. UHM ◽  
E. H. CHOI ◽  
J. J. KO ◽  
H. M. SHIN ◽  
G. S. CHO
Keyword(s):  
Electron Beam ◽  
Theoretical Model ◽  
Ion Channel ◽  
Space Charge ◽  
Relativistic Electron ◽  
Relativistic Electron Beam ◽  
Space Charge Limited Current ◽  
Ion Density ◽  
Limited Current ◽  
Space Charge Limited

Electron-beam propagation from a gas-filled diode is investigated. The beginning portion of the electron beam pulse creates an ion channel not only inside the diode but also in the region beyond the anode. A theoretical model is developed for the space-charge-limited current of a relativistic electron beam propagating through an ion channel. A simple analytical expression for the space-charge-limited current is obtained within the context of a thin-beam approximation, where the conducting-tube radius is much larger than the beam radius. The beam current propagating through an ion channel is measured experimentally for a mildly relativistic electron beam. Whenever the ion density inside the diode is the same as the beam electron density, the diode is short-circuited. The ion-channel density at the short-circuiting time is calculated numerically and is used to estimate the space-charge-limited current. It is shown that the experimental data agree well with the analytical results predicted by the theoretical model.

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