Beam–Wave Interaction in Corrugated Structures in the Small-Signal Regime

Latsas, George P.; Vomvoridis, J. L.; Avramides, K.A.; Tigelis, I. G.

doi:10.1109/tps.2009.2029107

Cited by 18 publications

(14 citation statements)

References 22 publications

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“…Latsas and colleagues (2009), in their Figure 9, obtained it to be 0.39 ns 1 . The results are qualitatively similar to the previous works (Banna, 2002;Wang et al, 2005b;Latsas et al, 2009).…”

supporting

confidence: 92%

“…Wang et al (2005b), in their Figure 7, obtained them as 7.2 GHz and 11.2 GHz, respectively. On the other hand, Latsas et al (2009), in their Figure 8, obtained them as 7 GHz and 11.2 GHz. In Figure 3(b) of this article, the maximum temporal growth rate normalized by 2 of Cerenkov instability is found to be 0.37 ns 1 for the TM 01 mode.…”

mentioning

confidence: 96%

“…The corresponding temporal growth rate, normalized by 2 , is given in Figure 3(b). For the sake of comparison with previous works, the numerical parameters of the structure are taken as R 1 D 1:713 cm, R 2 D 1:175 cm, z 0 D 0:75 cm, and D 0:15 cm (Wang et al, 2005a;Banna, 2002;Latsas et al, 2009). As these earlier works dealt with infinite strength magnetic field, B 0 D 1 is considered.…”

mentioning

confidence: 99%

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Excitation of an Axisymmetric Arbitrary-Walled Periodic Slow-Wave Structure by an Electron Beam Confined by a Finite-Strength Magnetic Field

et al. 2011

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Dispersion relation is obtained for an axisymmetric periodic slow-wave structure having arbitrary radial profile driven by an electron beam that is confined by a finite axial magnetic field. The slow-wave structure wall profile is expressed by a finite Fourier series sum, and field theory is utilized for derivation of the dispersion relation. Numerical analysis is carried out to study Cerenkov and slow cyclotron instabilities.

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confidence: 92%

mentioning

confidence: 96%

mentioning

confidence: 99%

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Excitation of an Axisymmetric Arbitrary-Walled Periodic Slow-Wave Structure by an Electron Beam Confined by a Finite-Strength Magnetic Field

et al. 2011

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“…In these variants of beam tunnels, due to their complexity and large electrical size, it is difficult to study the corresponding electromagnetic phenomena. The semi-analytical methods developed to treat them, incorporate assumptions (mainly on the geometrical properties) that limit their applicability to the real complex structure [9][10][11]. On the other hand, numerical electromagnetic methods, e.g.…”

Section: Introductionmentioning

confidence: 99%

Dispersion properties of rectangularly‐corrugated waveguide structures by the in‐house 3D FDTD code COCHLEA in cylindrical coordinates

Peponis¹,

Latsas²,

Ioannidis

et al. 2018

IET Microwaves, Antennas & Propagation

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An in‐house full‐wave numerical code COCHLEA based on the Finite Difference in Time Domain (FDTD) method has been developed and used to study the dispersion properties of corrugated waveguide structures. The mathematical formulation of the corresponding electromagnetic problem is presented in detail. Numerical results are derived for axially corrugated waveguides similar to those appeared in gyrotron stacked beam tunnels and are compared with those obtained by the in‐house semi‐analytical numerical code FISHBONE.

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“…Despite these losses, parasitic oscillations often occur inside the gyrotron beam tunnel. In this work, we perform a parametric study of the geometry parameters on the growth rate of the instability of parasitic oscillations, for a gyrotron beam tunnel using SHM and the linearized Vlasov equation presented in detail in [2] and [4].…”

Section: Introductionmentioning

confidence: 99%

Parametric study of a coaxial gyrotron stacked beam tunnel

Moraitou

Latsas

Ioannidis

et al. 2012

2012 Abstracts IEEE International Conference on Plasma Science

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Coaxial gyrotrons offer the potential to generate microwave power in the multi-megawatt levels at frequencies well above 100 GHz 1 , since very high-order volume modes can be used. The presence of the coaxial insert reduces the voltage depression and eliminates the restrictions of mode selectivity, making it possible to maintain the cavity ohmic losses at a reasonable low level (<2kW/cm 2 ) allowing the use of very high-order volume modes.However, the increased beam currents and energies involved can cause loss of stable gyrotron operation by the excitation of spurious high frequency oscillations in the beam tunnel 2-3 . These oscillations seem to be limiting factors for output power and efficiency in several current projects 4 . Specifically, the azimuthally symmetric high-order TE 0n gyro-backward waves are the most dangerous source of parasitic oscillations, since it is difficult to attenuate them 5 .In this work, we perform a parametric study of the geometric properties of the beam tunnel using the space harmonic method (SHM) and the linearized Vlasov equation. The influence of geometry parameters on the growth rate of parasitic oscillations in a simplified coaxial gyrotron beam tunnel is investigated.

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Beam–Wave Interaction in Corrugated Structures in the Small-Signal Regime

Cited by 18 publications

References 22 publications

Excitation of an Axisymmetric Arbitrary-Walled Periodic Slow-Wave Structure by an Electron Beam Confined by a Finite-Strength Magnetic Field

Excitation of an Axisymmetric Arbitrary-Walled Periodic Slow-Wave Structure by an Electron Beam Confined by a Finite-Strength Magnetic Field

Dispersion properties of rectangularly‐corrugated waveguide structures by the in‐house 3D FDTD code COCHLEA in cylindrical coordinates

Parametric study of a coaxial gyrotron stacked beam tunnel

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