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Mar 2013

Volume 20, Issue 3, Articles (03xxxx)

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Phys. Plasmas 20, 032106 (2013); http://dx.doi.org/10.1063/1.4794320 (10 pages)

M. Raghunathan and R. Ganesh
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Electrode-plasma-driven radiation cutoff in long-pulse, high-power microwave devices

D. V. Rose, C. L. Miller, S. Portillo, and D. R. Welch

Phys. Plasmas 20, 034501 (2013); http://dx.doi.org/10.1063/1.4794955 (4 pages)

Online Publication Date: 8 March 2013

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The impact of electrode plasma dynamics on the radiation production in a high power microwave device is examined using particle-in-cell simulations. Using the design of a compact 2.4 GHz magnetically insulated line oscillator (MILO) as the basis for numerical simulations, we characterize the time-dependent device power and radiation output over a range of cathode plasma formation rates. These numerical simulations can self-consistently produce radiation characteristics that are similar to measured signals in long pulse duration MILOs. This modeling capability should result in improved assessment of existing high-power microwave devices and lead to new designs for increased radiation pulse durations.
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52.75.-d Plasma devices
52.65.Rr Particle-in-cell method
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
02.60.Cb Numerical simulation; solution of equations
52.59.Ye Plasma devices for generation of coherent radiation

Plasma parameters and electron energy distribution functions in a magnetically focused plasma

C. M. Samuell, B. D. Blackwell, J. Howard, and C. S. Corr

Phys. Plasmas 20, 034502 (2013); http://dx.doi.org/10.1063/1.4794841 (4 pages)

Online Publication Date: 12 March 2013

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Spatially resolved measurements of ion density, electron temperature, floating potential, and the electron energy distribution function (EEDF) are presented for a magnetically focused plasma. The measurements identify a central plasma column displaying Maxwellian EEDFs at an electron temperature of about 5 eV indicating the presence of a significant fraction of electrons in the inelastic energy range (energies above 15 eV). It is observed that the EEDF remains Maxwellian along the axis of the discharge with an increase in density, at constant electron temperature, observed in the region of highest magnetic field strength. Both electron density and temperature decrease at the plasma radial edge. Electron temperature isotherms measured in the downstream region are found to coincide with the magnetic field lines.
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52.58.-c Other confinement methods
52.70.Ds Electric and magnetic measurements
52.80.-s Electric discharges
52.25.-b Plasma properties

Emission of radiation induced by pervading Alfvén waves

G. Q. Zhao and C. S. Wu

Phys. Plasmas 20, 034503 (2013); http://dx.doi.org/10.1063/1.4798493 (4 pages)

Online Publication Date: 27 March 2013

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It is shown that under certain conditions, propagating Alfvén waves can energize electrons so that consequently a new cyclotron maser instability is born. The necessary condition is that the plasma frequency is lower than electron gyrofrequency. This condition implies high Alfvén speed, which can pitch-angle scatter electrons effectively and therefore the electrons are able to acquire free energy which are needed for the instability.
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52.35.Bj Magnetohydrodynamic waves (e.g., Alfven waves)
52.35.Qz Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.)
52.20.Fs Electron collisions
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.25.Tx Emission, absorption, and scattering of particles
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