Excitation of electromagnetic waves by relativistic electron beam in a plasma filled rippled wall waveguide

Journal Article · Sat Jan 01 00:00:00 EST 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870548· OSTI ID:6691635

Choyal, Y; Maheshwari, K P ^[1]

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1. Department of Physics, D. A. University, Khandwa Road, Indore 452 001 (India)

An analytical and numerical study is presented herewith to get an insight into the excitation of forward and backward waves caused by an intense relativistic electron beam in a rippled wall plasma filled waveguide with weak modulation. The numerical results of growth rate are derived in the case of weak modulation at [ital k][sub [ital z]]=[pi]/[ital z][sub 0] (the [pi] point). Numerical results also show that no excitation of waves takes place if relativistic factor of the beam [gamma][lt](1+[mu][sup 2][sub 0[ital s]]/[ital R][sup 2][sub 0][ital k][sup 2][sub 0])[sup 1/2]. For [gamma][gt](1[minus][mu][sup 2][sub 0[ital s]]/[ital R][sup 2][sub 0][ital k][sup 2][sub 0])[sup [minus]1/2], the beam excites both forward and backward waves, and only forward waves if (1+[mu][sup 2][sub 0[ital s]]/[ital R][sup 2][sub 0][ital k][sup 2][sub 0])[sup 1/2][lt][gamma][lt] (1[minus][mu][sup 2][sub 0[ital s]]/[ital R][sup 2][sub 0][ital k][sup 2][sub 0])[sup [minus]1/2]. The dependence of the frequency of the generated forward waves on beam energy is also studied numerically and the results are compared with those of the experiment [IEEE Trans. Plasma Sci. [bold PS]-[bold 18], 490 (1990)]. The effect of corrugation depth of rippled wall plasma filled backward wave oscillator (BWO) on minimum frequency generated is also studied.

• OSTI ID: 6691635
• Journal Information: Physics of Plasmas; (United States), Vol. 1:1; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
WAVEGUIDES
DISPERSION RELATIONS
RELATIVISTIC BEAM INJECTION
BEAM-PLASMA SYSTEMS
ELECTROMAGNETIC FIELDS
ELECTRON BEAMS
ENERGY DEPENDENCE
EXCITATION
INSTABILITY GROWTH RATES
MICROWAVE RADIATION
MODULATION
NUMERICAL SOLUTION
BEAM INJECTION
BEAMS
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
LEPTON BEAMS
PARTICLE BEAMS
RADIATIONS
700350* - Plasma Production
Heating
Current Drive
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