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5 Apr 2010

Volume 96, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 96, 143103 (2010); http://dx.doi.org/10.1063/1.3378684 (3 pages)

Joshua A. Kellar, Justice M. P. Alaboson, Qing Hua Wang, and Mark C. Hersam
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A cusp electron gun for millimeter wave gyrodevices

C. R. Donaldson, W. He, A. W. Cross, F. Li, A. D. R. Phelps, L. Zhang, K. Ronald, C. W. Robertson, C. G. Whyte, and A. R. Young

Appl. Phys. Lett. 96, 141501 (2010); http://dx.doi.org/10.1063/1.3374888 (3 pages) | Cited 7 times

Online Publication Date: 5 April 2010

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The experimental results of a thermionic cusp electron gun, to drive millimeter and submillimeter wave harmonic gyrodevices, are reported in this paper. Using a “smooth” magnetic field reversal formed by two coils this gun generated an annular-shaped, axis-encircling electron beam with 1.5 A current, and an adjustable velocity ratio α of up to 1.56 at a beam voltage of 40 kV. The beam cross-sectional shape and transported beam current were measured by a witness plate technique and Faraday cup, respectively. These measured results were found to be in excellent agreement with the simulated results using the three-dimensional code MAGIC.
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84.40.Ik Masers; gyrotrons (cyclotron-resonance masers)
84.47.+w Vacuum tubes
84.40.-x Radiowave and microwave (including millimeter wave) technology

Application of microplasma discharge in a spark gap for high repetitive switching

Hasibur Rahaman, Sang Hoon Nam, Jong Woo Nam, Byung-Joon Lee, and Klaus Frank

Appl. Phys. Lett. 96, 141502 (2010); http://dx.doi.org/10.1063/1.3383240 (3 pages)

Online Publication Date: 5 April 2010

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The electrical breakdown in a spark gap for repetitive switching has been a long research interest. For this purpose, microplasma discharge is implemented in the spark gap which is further integrated inside a coaxial transmission line. This work addresses important physical properties and insights of the microplasma discharge, to be optimized, such as plasma generation in a spark channel, dielectric recovery process, and residual plasma in the postspark discharge period. Although understanding the microplasma discharge is the primary goal, considerable attention has been focused on an external circuit scheme to drive the discharge system at a high repetition rate.
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52.80.Mg Arcs; sparks; lightning; atmospheric electricity
52.75.Kq Plasma switches (e.g., spark gaps)
52.50.Dg Plasma sources

The controlling role of envelope mismatches in intense inhomogeneous charged beams

E. G. Souza, A. Endler, R. Pakter, F. B. Rizzato, and R. P. Nunes

Appl. Phys. Lett. 96, 141503 (2010); http://dx.doi.org/10.1063/1.3385393 (3 pages) | Cited 3 times

Online Publication Date: 5 April 2010

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Inhomogeneous cold beams undergo wave breaking as they move along the axis of a magnetic focusing system. All the remaining control parameters fixed, the earliest wave breaking is a sensitive function of the inhomogeneity parameter: the larger the inhomogeneity, the sooner the breaking. The present work analyzes the role of envelope size mismatches in the wave breaking process. The analysis reveals that the wave breaking time is also very susceptible to the mismatch; judiciously chosen mismatches can largely extend beam lifetimes. The work is extended to include recently discussed issues on the presences of fast and slow regimes of wave breaking, and the theory is shown to be accurate against simulations.
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42.79.-e Optical elements, devices, and systems
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