A re-examination of the Buneman–Hartree condition in a cylindrical smooth-bore relativistic magnetron

Lau, Y. Y.; Luginsland, J.W.; Cartwright, Keith; Simon, David; Tang, Wilkin; Hoff, Brad W.; Gilgenbach, R. M.

doi:10.1063/1.3328804

Cited by 36 publications

(35 citation statements)

References 29 publications

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“…The voltage waveform is introduced by the functions of STEP and SMOOTH_RAMP. [13][14][15] In practice, the B value corresponds to the maximum of magnetic field generated by solenoids, and the U value is associated with the amplitude of the applied voltage.…”

Section: Analysis Of Pulse Durationmentioning

confidence: 99%

Experimental investigations of the TE11 mode radiation from a relativistic magnetron with diffraction output

Liu

Zhang

et al. 2012

Physics of Plasmas

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Directly radiating microwaves at TE 11 mode, a relativistic magnetron with diffraction output (MDO) is experimentally investigated. Two important factors, transition section and working condition, significantly affecting the microwave powers, efficiencies, and pulse durations are analyzed. The experimental results on our designed MDO show that the optimized transition section with the parameters, 46 mm in height and 70 mm in length, is beneficial for producing high power TE 11 mode microwaves. Under the low applied voltage condition (less than 650 kV), the power conversion efficiency will be higher than that obtained from the high applied voltage condition. 24 ns of the microwave duration is a typical value under the voltage duration of 56 ns. Pulse shortens will happen if the applied voltage is higher than 650 kV. When the applied voltage reaches 880 kV, the microwave duration is only just 12 ns. Impendence mismatch between the accelerator and the diode is the chief reason causing the pulse shortens. V C 2012 American Institute of Physics. [http://dx.

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Section: Analysis Of Pulse Durationmentioning

confidence: 99%

Experimental investigations of the TE11 mode radiation from a relativistic magnetron with diffraction output

Liu

Zhang

et al. 2012

Physics of Plasmas

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“…The operating condition, i.e., the B-H condition, in a cylindrical relativistic magnetron assumes a very different form depending on the single particle model or the Brillouin flow model, however. 4 Such a difference is always present, whether the voltage is relativistic or not. These two models yield the same B-H condition only in the limit of a planar magnetron.…”

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confidence: 99%

Brillouin flow in recirculating planar magnetron

Simon

Lau

Franzi

et al. 2013

2013 Abstracts IEEE International Conference on Plasma Science (ICOPS)

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We examine the Brillouin flow in the conventional magnetron, inverted magnetron, and planar magnetron, with respect to the equilibrium, stability, and operating conditions. This renewed interest was prompted by our recent invention of the recirculating planar magnetron (RPM) 1 , where rapid start up utilizes the negative mass instability in the inverted magnetron configuration 2 . Given that Brillouin flow is the most likely state in a crossed-field gap, and that various embodiments of the RPM consist of the conventional, inverted, and planar magnetron, it is necessary to study equilibrium, stability, and operating conditions at the same footing.

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“…More recently, a large number of papers have investigated the equilibrium and stability of these systems by explicitly taking into account the particles self-fields. [6][7][8][9][10][11][12][13][14][15] The self-fields may play a major role in the dynamics since they can also limit the particles flow from the cathode to the anode as the current density exceeds a certain threshold and a space-charge limited (SCL) regime emerges. 6,10,16 However, given the afore mentioned complexity that long ranged self-fields add to the problem, the large majority of the theoretical analysis done so far are based on models that assume that the electron flow is either completely cold or is a fluid with an a priori postulated equation of state.…”

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Thermal effects and space-charge limited transition in crossed-field devices

2014

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Articles you may be interested inRelativistic solutions for one-and two-dimensional space-charge limited current in coaxial diode Phys. Plasmas 20, 053103 (2013) A fully kinetic model for the electron flow in a crossed field device is derived and used to determine the system stationary states. It is found that for low injection temperatures, there is a simultaneous presence of distinct stationary solutions and an abrupt transition between accelerating and space-charge limited regimes. On the other hand, for high injection temperatures, there is only a single stationary solution branch and the change between the regimes becomes continuous. For intermediate temperatures, it is then identified a critical point that separates the abrupt and continuous behaviors. It is also investigated how intrinsic space-charge oscillations may drive stationary states unstable in certain parameter regimes. The results are verified with N-particle self-consistent simulations. V C 2014 AIP Publishing LLC. [http://dx

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A re-examination of the Buneman–Hartree condition in a cylindrical smooth-bore relativistic magnetron

Cited by 36 publications

References 29 publications

Experimental investigations of the TE11 mode radiation from a relativistic magnetron with diffraction output

Experimental investigations of the TE11 mode radiation from a relativistic magnetron with diffraction output

Brillouin flow in recirculating planar magnetron

Thermal effects and space-charge limited transition in crossed-field devices

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