TY - JOUR

T1 - Second harmonic electromagnetic emission in a beam-driven plasma antenna

AU - Annenkov, V. V.

AU - Berendeev, E. A.

AU - Volchok, E. P.

AU - Timofeev, I. V.

N1 - Publisher Copyright: © 2019 IOP Publishing Ltd.

PY - 2019/3/26

Y1 - 2019/3/26

N2 - Generation of electromagnetic (EM) radiation near the second harmonic of the plasma frequency during the injection of an electron beam into a rippled-density plasma channel is investigated using both analytical theory and particle-in-cell simulations. The generating scheme is based on nonlinear interaction of the most unstable beam-driven potential plasma wave with its satellite arising due to scattering on the longitudinal modulation of plasma density. Resulting superluminal oscillations of electric current in a finite-size plasma channel radiate EM waves via the same mechanism which has been recently studied for the fundamental harmonic emission and reffered as a beam-driven plasma antenna. It is shown that theoretical predictions for the optimal plasma width and modulation period are confirmed by simulation results and the power conversion efficiency of the second harmonic emission reaches several percent. Such an efficient mechanism opens the path to explanation of laboratory experiments with a thin electron beam at the GOL-3 mirror trap as well as to developing the scheme of terahertz generation at the gigawatt power level.

AB - Generation of electromagnetic (EM) radiation near the second harmonic of the plasma frequency during the injection of an electron beam into a rippled-density plasma channel is investigated using both analytical theory and particle-in-cell simulations. The generating scheme is based on nonlinear interaction of the most unstable beam-driven potential plasma wave with its satellite arising due to scattering on the longitudinal modulation of plasma density. Resulting superluminal oscillations of electric current in a finite-size plasma channel radiate EM waves via the same mechanism which has been recently studied for the fundamental harmonic emission and reffered as a beam-driven plasma antenna. It is shown that theoretical predictions for the optimal plasma width and modulation period are confirmed by simulation results and the power conversion efficiency of the second harmonic emission reaches several percent. Such an efficient mechanism opens the path to explanation of laboratory experiments with a thin electron beam at the GOL-3 mirror trap as well as to developing the scheme of terahertz generation at the gigawatt power level.

KW - beam-plasma interaction

KW - generation of electromagnetic waves

KW - THz radiation

KW - ELECTRON

KW - 2-STREAM INSTABILITY

KW - GENERATION

UR - http://www.scopus.com/inward/record.url?scp=85067258361&partnerID=8YFLogxK

U2 - 10.1088/1361-6587/ab0789

DO - 10.1088/1361-6587/ab0789

M3 - Article

AN - SCOPUS:85067258361

VL - 61

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 5

M1 - 055005

ER -