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7 Mar 2011

Volume 98, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 98, 104101 (2011); http://dx.doi.org/10.1063/1.3560505 (3 pages)

Zhongchang Wang, Susumu Tsukimoto, Rong Sun, Mitsuhiro Saito, and Yuichi Ikuhara
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Substrate heating influence on the deposition rate of oxides during pulsed laser deposition in ambient gas

S. Amoruso, C. Aruta, R. Bruzzese, X. Wang, and U. Scotti di Uccio

Appl. Phys. Lett. 98, 101501 (2011); http://dx.doi.org/10.1063/1.3565157 (3 pages) | Cited 5 times

Online Publication Date: 10 March 2011

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We investigate the effects of ambient pressure and substrate temperature on the deposition rate of oxides grown by pulsed laser deposition in oxygen atmosphere. The deposition rate of LaGaO3 (LGO) and LaAlO3 (LAO) is studied at room temperature by means of a quartz crystal microbalance and at 800 °C by exploiting reflection high energy electron diffraction. We observe a clear dependence of the deposition rate on temperature for an oxygen pressure between 10−2 and 1 mbar. A simple model based on multiple-elastic-scattering processes thoroughly describes the observed dependence of the deposition rate on the pressure/density of the background gas.
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81.15.Fg Pulsed laser ablation deposition

A high-power high-efficiency klystronlike relativistic backward wave oscillator with a dual-cavity extractor

Renzhen Xiao (肖仁珍), Changhua Chen (陈昌华), Jun Sun (孙钧), Xiaowei Zhang (张晓微), and Lijun Zhang (张黎军)

Appl. Phys. Lett. 98, 101502 (2011); http://dx.doi.org/10.1063/1.3562612 (3 pages) | Cited 11 times

Online Publication Date: 11 March 2011

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A klystronlike relativistic backward wave oscillator (RBWO) with a dual-cavity extractor is presented. The phase of the axial electric field component Ez varies by 0° in the dual-cavity extractor, and a larger electric field appears in the second extraction cavity, in comparison with a single-cavity extractor. Such an improved field distribution is beneficial for converting modulated beam power into microwave power. The particle in cell simulation results reveal that microwaves with power of 10 GW, frequency of 4.3 GHz are generated, and conversion efficiency is 48% when diode voltage is 1.2 MV and beam current 17.3 kA.
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84.40.Fe Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.)
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