NDLI: Plasma-filled rippled wall rectangular backward wave oscillator driven by sheet electron beam

Content Provider	Springer Nature Link
Author	MITTAL, K C MAHESHWARI, K P
Copyright Year	2011
Abstract	Performance of the backward wave oscillator (BWO) is greatly enhanced with the introduction of plasma. Linear theory of the dispersion relation and the growth rate have been derived and analysed numerically for plasma-filled rippled wall rectangular waveguide driven by sheet electron beam. To see the effect of plasma on the TM$_{01}$ cold wave structure mode and on the generated frequency, the parameters used are: relativistic factor γ = 1.5 (i.e. v/c = 0.741), average waveguide height y $_{0}$ = 1.445 cm, axial corrugation period z $_{0}$ = 1.67 cm, and corrugation amplitude ε = 0.225 cm. The plasma density is varied from zero to 2 ×10$^{12}$ cm$^{ − 3}$. The presence of plasma tends to raise the TM$_{01}$ mode cut-off frequency (14 GHz at 2 ×10$^{12}$ cm$^{ − 3}$ plasma density) relative to the vacuum cut-off frequency (5 GHz) which also causes a decrease in the group velocity everywhere, resulting in a flattening of the dispersion relation. With the introduction of plasma, an enhancement in absolute instability was observed.
Starting Page	501
Ending Page	511
Page Count	11
File Format	PDF
ISSN	03044289
Journal	Pramana
Volume Number	76
Issue Number	3
e-ISSN	09737111
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-05-27
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sheet electron beam; backward wave oscillator; plasma. Astrophysics and Astroparticles Physics Astronomy, Observations and Techniques
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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