Possible Plasma Effects on Gyrotron Operation

Schünemann, K.; Zaginaylov, G.I.

doi:10.1515/freq.2001.55.9-10.252

Cited by 6 publications

(1 citation statement)

References 27 publications

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“…In [22][23][24], the operation of a helix plasma-assisted slow-wave oscillator was studied. The background plasma has also been considered in sheath helix loaded wave guides [25], gyrotrons [26,27] and dielectric Cherenkov masers [28].…”

Section: Introductionmentioning

confidence: 99%

Wave mode instabilities in a two-stream free-electron laser with a background plasma

Nadrifard¹,

Maraghechi²,

Mohsenpour³

2013

Plasma Phys. Control. Fusion

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A theory is presented for a two-stream free-electron laser (FEL) with a background plasma. A dispersion relation (DR) for the unstable couplings of wave modes is derived using fluid formulation. This DR is solved numerically to find the unstable modes and their growth rate. The effect of the velocity difference of the two electron beams as well as the background plasma on the FEL resonance and the two-stream instability is studied. It is shown that their separate as well as combined effects can increase the growth rates.

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Section: Introductionmentioning

confidence: 99%

Wave mode instabilities in a two-stream free-electron laser with a background plasma

Nadrifard¹,

Maraghechi²,

Mohsenpour³

2013

Plasma Phys. Control. Fusion

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Dispersion relation and growth rate in a free-electron laser with a background plasma

Mohsenpour

Maraghechi

2015

J. Plasma Phys.

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The method of perturbation has been applied to derive a general dispersion relation for a free-electron laser (FEL) with background plasma and helical wiggler in the presence of an axial magnetic field. This dispersion relation is solved numerically to find unstable interactions among all of the wave modes. Numerical calculations show that new coupling between the left wave and positive-energy space-charge of electron beam are found when wiggler induced velocity is large. This coupling does not change with increasing the plasma density. The growth rate of FEL is changed with increasing the plasma density and the normalized axial magnetic field.

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Kinetic description of a plasma-loaded free-electron laser

Babaei

Maraghechi

2007

Physics of Plasmas

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A kinetic theory is used to find the dispersion relation of a plasma-loaded free-electron laser that takes into account the velocity spread of both beam and plasma electrons. For the weak-coupling regime, the dispersion relation for a cold electron beam and plasma is obtained and is studied numerically. The kinetic theory predicts that, for the cold beam and plasma, plasma density increases the growth rate of the higher-frequency resonance and lowers it for the lower-frequency resonance up to a certain plasma density. By increasing the plasma density further, a critical density will be reached that diminishes the instability.

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Possible Plasma Effects on Gyrotron Operation

Cited by 6 publications

References 27 publications

Wave mode instabilities in a two-stream free-electron laser with a background plasma

Wave mode instabilities in a two-stream free-electron laser with a background plasma

Dispersion relation and growth rate in a free-electron laser with a background plasma

Kinetic description of a plasma-loaded free-electron laser

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