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P: Fachverband Plasmaphysik

P 5: Laserplasmen und Quantenplasmen

P 5.4: Talk

Monday, February 25, 2013, 17:30–17:45, HS 3

Amplification of a surface electromagnetic wave by running over plasma surface ultrarelativistic electron bunch as a new scheme for generation of Terahertz radiation — •Saltanat P. Sadykova¹, Anri A. Rukhadze², T. G. Samkharadze², and Konstantin V. Khishchenko³ — ¹Max-Born Institut fuer Nichtlineare Optik und Kurzzeitspektroskopie im Forschungsverbund Berlin e.V., DESY Hamburg — ²Prokhorov General Physics Institute, Russian Academy of Sciences, Vavilov Str., 38., Moscow, 119991, Russia — ³Joint Institute for High Temperatures RAS, Izhorskaya 13 bldg 2, Moscow 125412, Russia

The amplification of a surface electromagnetic wave by means of ultrarelativistic monoenergetic electron bunch running over the flat plasma surface in absence of a magnetic field is studied theoretically. It is shown that when the ratio of electron bunch number density to plasma electron number density multiplied by a powered to 5 relativity factor is much higher than 1, i.e γ⁵ n_b/n_p>> 1, the saturation field of the surface electromagnetic wave induced by trapping of bunch electrons gains the magnitude: E_x=B_y≈ ω_p m cγ^5/7/e (2n_b/ n_p)^1/7≈ 10¹¹ V/m, hence, the energy density flux (Poyinting vector) | P |=c/4π (E_x²)≃ 6 · 10¹⁵ W/cm⁻² and does not approache the surface electromagnetic wave front breakdown threshold in plasma [1]. [1] A. A. Rukhadze, S. P. Sadykova, T. G. Samkharadze, K. V. Khishchenko, arXiv:1210.0610 (2012)