Excitation of electromagnetic surface waves by an annular electron beam in a plasma waveguide with a dielectric rod and a magnetized plasma column

Abstract

The dispersion relation for symmetrical TM electromagnetic surface waves propagating in a plasma waveguide with a strongly magnetized plasma column and a dielectric rod is investigated. The growth rate for excitation of these waves is obtained and its dependence on the radius of the annular beam, current intensity and accelerating voltage are investigated.

Higher radial modes of azimuthal surface waves in magnetoactive cylindrical plasma waveguides

“…Probably this second case took place in numerically solving the dispersion relation in Jazi & Mehdian (2004). It is a pity that the mistakes in deriving the expressions for the components of the extraordinarily polarized ASW fields in Shokri & Jazi (2003), Jazi & Mehdian (2004), Jazi & Shokri (2005), Jazi et al. (2006), Daryanoosh & Mehdian (2007) require these authors to revise the results obtained therein.…”

“…The second part was devoted to studying the dispersion properties of extraordinarily polarized ASWs with the components E r , E ϕ , B z -this part is wrong because of mistakes in the algebra when deriving the expressions for E r and E ϕ from the set of Maxwell equations. The same mistakes are present in the papers by Shokri & Jazi (2003), Jazi & Shokri (2005), Jazi, Shokri & Arbab (2006) and Daryanoosh & Mehdian (2007) and make these papers meaningless. The paper by Shokri & Jazi (2003) presented the limiting case of the paper by Jazi & Mehdian (2004), the space r < R 4 was occupied there by a vacuum.…”

“…The expressions (2.4) were derived for the first time by Wait (1966). The wrong expressions for E r and E ϕ in Shokri & Jazi (2003), Jazi & Mehdian (2004), Jazi & Shokri (2005), Jazi et al (2006), Daryanoosh & Mehdian (2007) invalidate the conclusions therein.…”

Azimuthal electromagnetic surface waves in a rod dielectric magnetized plasma waveguide and their excitation by an annular relativistic rotating electron beam

“…The development of sources of radiation in the microwave portion of the electromagnetic spectrum, which extends from approximately 300 MHz to 300 GHz, began many years ago. However, an impressive increase in the power and operating frequency of these sources has taken place in the last few decades, due to progress in a new branch of physics that can be called relativistic high-frequency electronics [8][9][10][11]. The term relativistic refers first to the use of high-voltage electron beams with velocities close to the speed of light, which can have very high current densities, and second to the appearance of new microwave sources based on specific relativistic effects [9][10][11].…”

Theoretical study of the surface waves in semi-bounded quantum collisional plasmas

“…6 Due to their special properties, the surface waves have already been the subject of many theoretical, experimental, and numerical researches. [7][8][9][10][11][12][13][14][15] These waves can be excited on a sufficiently dense plasma and essentially depend on the plasma properties. The surface waves propagation characteristics in dense plasmas are also affected by quantum effects.…”