Research output: Contribution to journal › Article › peer-review
Theory of a beam-driven plasma antenna. / Timofeev, I. V.; Volchok, E. P.; Annenkov, V. V.
In: Physics of Plasmas, Vol. 23, No. 8, 083119, 2016.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Theory of a beam-driven plasma antenna
AU - Timofeev, I. V.
AU - Volchok, E. P.
AU - Annenkov, V. V.
N1 - Funding Information: Russian Foundation for Basic Research (Grant No. 15-32-20432).?%blankline%?. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2016
Y1 - 2016
N2 - In this paper, we propose a theory describing generation of electromagnetic waves in a thin beamplasma system with a characteristic transverse size comparable with the radiation wavelength. In fact, a thin plasma column with a longitudinal density modulation works like a plasma antenna in which an electron beam can excite a superluminal wave of electric current. It has previously been shown that, if the period of this modulation coincides with the wavelength of the most unstable beam-driven mode, radiation at a frequency slightly below the plasma frequency is emitted transversely to the plasma column and generated in thin boundary layers. For the plasma thickness comparable with the skin-depth, generation of the terahertz radiation can reach high efficiency (∼10%) in such a scheme, but the absolute power of this radiation cannot be increased by increasing the transverse plasma size. In this paper, we study whether the power of such an antenna can be increased in the regime of oblique emission when the magnetized plasma is transparent to the radiated electromagnetic waves and the whole plasma volume may be involved in their generation.
AB - In this paper, we propose a theory describing generation of electromagnetic waves in a thin beamplasma system with a characteristic transverse size comparable with the radiation wavelength. In fact, a thin plasma column with a longitudinal density modulation works like a plasma antenna in which an electron beam can excite a superluminal wave of electric current. It has previously been shown that, if the period of this modulation coincides with the wavelength of the most unstable beam-driven mode, radiation at a frequency slightly below the plasma frequency is emitted transversely to the plasma column and generated in thin boundary layers. For the plasma thickness comparable with the skin-depth, generation of the terahertz radiation can reach high efficiency (∼10%) in such a scheme, but the absolute power of this radiation cannot be increased by increasing the transverse plasma size. In this paper, we study whether the power of such an antenna can be increased in the regime of oblique emission when the magnetized plasma is transparent to the radiated electromagnetic waves and the whole plasma volume may be involved in their generation.
UR - http://www.scopus.com/inward/record.url?scp=85019773327&partnerID=8YFLogxK
UR - https://www.elibrary.ru/item.asp?id=31040081
U2 - 10.1063/1.4961218
DO - 10.1063/1.4961218
M3 - Article
AN - SCOPUS:85019773327
VL - 23
JO - Physics of Plasmas
JF - Physics of Plasmas
SN - 1070-664X
IS - 8
M1 - 083119
ER -
ID: 27343998