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27 Jun 2011

Volume 98, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 98, 263101 (2011); http://dx.doi.org/10.1063/1.3587576 (3 pages)

Jing Ye, Yu Zhao, Libin Tang, Li-Miao Chen, C. M. Luk, S. F. Yu, S. T. Lee, and S. P. Lau
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Observation of coherently enhanced tunable narrow-band terahertz transition radiation from a relativistic sub-picosecond electron bunch train

P. Piot, Y.-E Sun, T. J. Maxwell, J. Ruan, A. H. Lumpkin, M. M. Rihaoui, and R. Thurman-Keup

Appl. Phys. Lett. 98, 261501 (2011); http://dx.doi.org/10.1063/1.3604017 (3 pages) | Cited 2 times

Online Publication Date: 27 June 2011

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We experimentally demonstrate the production of narrow-band (δf/f ≈ 20% at f ≈ 0.5 THz) transition radiation with tunable frequency over [0.37, 0.86] THz. The radiation is produced as a train of sub-picosecond relativistic electron bunches transits at the vacuum-aluminum interface of an aluminum converter screen. The bunch train is generated via a transverse-to-longitudinal phase space exchange technique. We also show a possible application of modulated beams to extend the dynamical range of a popular bunch length diagnostic technique based on the spectral analysis of coherent radiation.
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29.27.Fh Beam characteristics
41.75.-i Charged-particle beams
41.85.-p Beam optics

The self-consistent nonlinear theory of electron cyclotron maser based on anomalous Doppler effect

Ling-Bao Kong, Zhi-Ling Hou, and Chao-Ran Xie

Appl. Phys. Lett. 98, 261502 (2011); http://dx.doi.org/10.1063/1.3604016 (3 pages) | Cited 1 time

Online Publication Date: 29 June 2011

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The self-consistent nonlinear equations, which describe electron cyclotron maser under the condition of anomalous Doppler effect, have been developed. By employing an initially rectilinear electron beam and a guiding static magnetic field, an efficient energy transfer between electrons and microwave can be achieved. The results suggest potential applications in designing a compact and efficient microwave generation/amplification device.
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42.50.Pq Cavity quantum electrodynamics; micromasers
84.40.Ik Masers; gyrotrons (cyclotron-resonance masers)
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