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9 Feb 2009

Volume 94, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 94, 062105 (2009); http://dx.doi.org/10.1063/1.3079078 (3 pages)

Ikai Lo, Chia-Ho Hsieh, Yu-Chi Hsu, Wen-Yuan Pang, and Ming-Chi Chou
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Smith–Purcell frequency multiplier with synchronization of radiation from a wide electron beam

V. L. Bratman, A. E. Fedotov, P. B. Makhalov, and F. S. Rusin

Appl. Phys. Lett. 94, 061501 (2009); http://dx.doi.org/10.1063/1.3079678 (3 pages) | Cited 5 times

Online Publication Date: 9 February 2009

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An orotronlike feedback can provide a significant increase in the selectivity and power of frequency-multiplied Smith–Purcell radiation of the electron bunches formed in the course of self-excitation of a grating surface eigenmode. This method looks promising for efficient terahertz generation from both weakly and mildly relativistic electron beams.
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07.77.Ka Charged-particle beam sources and detectors
41.75.Ht Relativistic electron and positron beams
84.30.-r Electronic circuits

Observation of weakly and strongly diverging ion beams in a magnetically expanding plasma

K. Takahashi and T. Fujiwara

Appl. Phys. Lett. 94, 061502 (2009); http://dx.doi.org/10.1063/1.3080205 (3 pages) | Cited 13 times

Online Publication Date: 9 February 2009

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The spatial distribution of an ion beam created in a magnetically expanding plasma using permanent magnets is experimentally investigated for 0.35 and 1 mTorr, where the magnetic-field strength is about 100 G in the plasma source and is decreasing into a few gauss in the diffusion chamber. The beam profile for 0.35 mTorr is weakly divergent. On the other hand, the strongly diverging beam is detected for 1 mTorr. The results are discussed from the viewpoint of the plasma-potential structures and imply the beam divergence caused by the radial electric fields in the ion acceleration region and the diffusion chamber.
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52.38.Kd Laser-plasma acceleration of electrons and ions
52.50.Dg Plasma sources
29.25.Ni Ion sources: positive and negative
52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)

Electrodynamic effects in nanosecond-pulse-sustained long dielectric-barrier-discharge plasma actuators

D. F. Opaits, M. N. Shneider, and R. B. Miles

Appl. Phys. Lett. 94, 061503 (2009); http://dx.doi.org/10.1063/1.3081027 (3 pages) | Cited 5 times

Online Publication Date: 10 February 2009

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Both numerical and experimental studies of the voltage distribution in a pulsed long dielectric barrier discharge plasma actuator have been performed. The results demonstrate the importance of electrodynamic effects in actuators for which the length is comparable with the length of the propagating pulses. These effects lead to a nonuniform voltage distribution along the electrodes, voltage doubling at the end of the actuator, nonoptimized power coupling to the actuator, and ringing. In addition to the direct voltage measurements, images of the discharge were taken which revealed its nonuniform structure.
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52.75.-d Plasma devices
52.80.-s Electric discharges
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