Relativistic electron beam heating of a hydrogen plasma in open confinement systems: Theoretical model

1988 ◽  
Vol 31 (3) ◽  
pp. 606 ◽  
Author(s):  
G. P. Gupta ◽  
T. Vijayan ◽  
V. K. Rohatgi
Keyword(s):  
Electron Beam ◽  
Theoretical Model ◽  
Relativistic Electron ◽  
Relativistic Electron Beam ◽  
Hydrogen Plasma ◽  
Beam Heating ◽  
Electron Beam Heating

Plasma heating by a relativistic electron beam with secondary instabilities

1978 ◽  
Vol 19 (1) ◽  
pp. 63-75 ◽  
Author(s):  
T. Tajima
Keyword(s):  
Electron Beam ◽  
Relativistic Electron ◽  
Plasma Wave ◽  
Relativistic Electron Beam ◽  
Plasma Heating ◽  
Parametric Instability ◽  
Beam Plasma ◽  
Wavenumber Spectrum ◽  
Secondary Instabilities ◽  
Electron Beam Heating

Relativistic electron beam heating of a dense plasma through the two-stream instability is studied. A large amplitude beam-plasma wave excited by the instability induces waves of wide wavenumber spectrum at low phase velocities through secondary parametric instability processes. In some cases such a complicated mode coupling of the beam-plasma wave into low phase velocity waves and their saturation may be described in terms of soliton formation. A beam stopping length associated with this process is obtained.

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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