Frequency and power response of high-power plasma-filled backward-wave oscillators

Goebel, Dan M.; Ponti, E.S.; Eisenhart, R.L.; Lemke, R.W.

doi:10.1063/1.873537

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…8,12 In this context, plasma-assisted devices can be configured as a slow-wave oscillator (PASATRON), backwardwave oscillator (BWO), and a traveling wave amplifier (TWT) operating without focusing magnetic fields. [13][14][15] These devices constitute unique sources of microwave radiation, in which the beam propagation in the absence of external magnetic fields is provided by the ion focusing and the electron interaction with the electromagnetic fields. Also, Pierce-type plasma diodes with a background of mobile ions can generate microwaves in a sequence of chaotic pulses whose duration is controlled by the retarding potential and the kind of ionized gas.…”

Section: Pierce Diodementioning

confidence: 99%

Edge state and crisis in the Pierce diode

Muñoz¹,

Barroso

Chian

et al. 2012

Chaos: An Interdisciplinary Journal of Nonlinear Science

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We study the chaotic dynamics of the Pierce diode, a simple spatially extended system for collisionless bounded plasmas, focusing on the concept of edge of chaos, the boundary that separates transient from asymptotic dynamics. We fully characterize an interior crisis at the end of a periodic window, thereby showing direct evidence of the collision between a chaotic attractor, a chaotic saddle, and the edge of chaos, formed by a period-3 unstable periodic orbit and its stable manifold. The edge of chaos persists after the interior crisis, when the global attractor of the system increases its size in the phase space.

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Section: Pierce Diodementioning

confidence: 99%

Edge state and crisis in the Pierce diode

Muñoz¹,

Barroso

Chian

et al. 2012

Chaos: An Interdisciplinary Journal of Nonlinear Science

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“…Such a frequency pulling effect is critical to parameter-sensitive oscillation, such as gyro-BWO. The reflection-induced effect has been investigated in some high power microwave oscillators, [18][19][20][21][22][23][24] but works that involve the gyro-BWO are few.…”

Section: Introductionmentioning

confidence: 99%

Stepwise frequency tuning of a gyrotron backward-wave oscillator

Chang

Chen

2004

Physics of Plasmas

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The gyrotron backward-wave oscillator (gyro-BWO) features broadband tunability, but ragged tuning curves are frequently observed experimentally. Accordingly, a Ka-band gyro-BWO experiment with external circuit mismatch was conducted to examine its tuning properties at two reflected strengths: one is slightly mismatched (15 dB reflection) and the other can be categorized as matched (30 dB reflection). Stepwise frequency tunings by varying the magnetic field, the beam voltage, and the beam current were observed under mismatched conditions. A self-locking model was introduced using the concept of injection-locking, where the output and reinjected signals tend to form a stable phase relation, favoring certain discrete oscillation frequencies. The observed frequencies agree closely with the calculated frequencies. Smooth tuning curves were also obtained, revealing a remedy for the stepwise tuning of a gyro-BWO.

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Design of a high efficiency relativistic backward wave oscillator with low guiding magnetic field

Song

Tan

et al. 2016

Physics of Plasmas

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A high efficiency relativistic backward wave oscillator working at a low guiding magnetic field is designed and simulated. A trapezoidal resonant reflector is used to reduce the modulation field in the resonant reflector to avoid overmodulation of the electron beam which will lead to a large momentum spread and then low conversion efficiency. The envelope of the inner radius of the slow wave structure (SWS) increases stepwise to keep conformal to the trajectory of the electron beam which will alleviate the bombardment of the electron on the surface of the SWS. The length of period of the SWS is reduced gradually to make a better match between phase velocity and electron beam, which decelerates continually and improves the RF current distribution. Meanwhile the modulation field is reduced by the introduction of nonuniform SWS also. The particle in cell simulation results reveal that a microwave with a power of 1.8 GW and a frequency of 14.7 GHz is generated with an efficiency of 47% when the diode voltage is 620 kV, the beam current 6.1 kA, and the guiding magnetic field 0.95 T.

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Frequency and power response of high-power plasma-filled backward-wave oscillators

Abstract: Articles you may be interested inEfficiency enhancement of a high power microwave generator based on a relativistic backward wave oscillator with a resonant reflector

Cited by 6 publications

References 14 publications

Edge state and crisis in the Pierce diode

Edge state and crisis in the Pierce diode

Stepwise frequency tuning of a gyrotron backward-wave oscillator

Design of a high efficiency relativistic backward wave oscillator with low guiding magnetic field

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