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Stable coaxial-waveguide gyrotron backward-wave oscillator with distributed losses
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10.1063/1.3486529
/content/aip/journal/pop/17/10/10.1063/1.3486529
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/10/10.1063/1.3486529
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Projection of electron orbit (circle) on the cross-sectional plane of the waveguide in the presence of a uniform magnetic field. Point O is the center of the coaxial waveguide. and are the inner and outer radii of the coaxial waveguide, respectively. Point A is the guiding center of the gyrating electron. Point B is the instantaneous position of the electron. and are the guiding-center radius and the Larmor radius, respectively. (b) Schematic drawings of the coaxial gyro-BWO with distributed wall losses.

Image of FIG. 2.
FIG. 2.

diagram of the fundamental harmonic gyro-BWO operating in the coaxial-waveguide mode (dotted point). The parabolas represent the transverse waveguide modes and the oblique lines denote the beam-wave resonance lines. Parameters used are , velocity ratio , and . The radius ratio and the outer radius of the coaxial waveguide are 2.2 and 0.4258 cm, respectively.

Image of FIG. 3.
FIG. 3.

Axial profiles of field amplitude (solid line), phase angle (dotted line), and beam energy deposition rate (dashed line) for the first three axial modes of at their start-oscillation currents . Parameters used are , , , , , , and .

Image of FIG. 4.
FIG. 4.

Dependence of coupling strength on normalized guiding-center radius for the transverse modes that (a) corotate and (b) counter-rotate with the electrons.

Image of FIG. 5.
FIG. 5.

Start-oscillation currents (solid line) and transit angles (dashed line) of the first three axial modes of the mode vs (a) magnetic field and (b) beam voltage . Parameters used are in (a), in (b), , , , , and .

Image of FIG. 6.
FIG. 6.

Start-oscillation currents of the transverse modes vs (a) magnetic field and (b) beam voltage . Parameters used are the same as those in Fig. 5.

Image of FIG. 7.
FIG. 7.

Start-oscillation currents of the competing transverse modes vs (a) the inner wall resistivity and (b) the outer wall resistivity of the lossy section, where and are normalized to the resistivity of copper . Parameters used are in (a), in (b), , , , , , , , and , where is the grazing magnetic field of the respective mode.

Image of FIG. 8.
FIG. 8.

Start-oscillation currents of the competing transverse modes vs the lossy section length in two cases: (a) the inner wall resistivity and (b) the outer wall resistivity . The other parameters are the same as those in Fig. 7.

Image of FIG. 9.
FIG. 9.

Start-oscillation currents of the transverse modes vs (a) magnetic field and (b) beam voltage . The solid curves and the dashed curves represent cases of light losses and heavy losses, respectively. Although the other parameters are the same as those in Fig. 5, , , and for the case of heavy losses.

Image of FIG. 10.
FIG. 10.

(a) Profile of the distributed losses. [(b)–(d)] Axial field profiles of the competing mode at , , and , where . The dashed curves and the solid curves represent cases with and without heavy losses, respectively. Parameters used are , , , , , , , , for the case of light losses, and for the case of heavy losses.

Image of FIG. 11.
FIG. 11.

Start-oscillation currents of the competing transverse modes vs (a) magnetic field and (b) beam voltage for (solid line) and (dashed line). Parameters used are in (a), in (b), , , , , and . for ; for .

Image of FIG. 12.
FIG. 12.

Calculated output power and oscillation frequency vs (a) magnetic field and (b) beam voltage . Parameters used are in (a), in (b), , , , , , , , and .

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/content/aip/journal/pop/17/10/10.1063/1.3486529
2010-10-12
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stable coaxial-waveguide gyrotron backward-wave oscillator with distributed losses
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/10/10.1063/1.3486529
10.1063/1.3486529
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