Speaker
Mikhail Viktorov
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/O3.J402.pdf
Frequency sweeping events in cyclotron emission of energetic electrons
in ECR discharge plasmas
M.E. Viktorov1 , A.G. Shalashov1 , E.D. Gospodchikov1 ,
D.A. Mansfeld1 , I.S. Abramov1 , S.V. Golubev1
1 Institute of Applied Physics of Russian Academy of Sciences, Nizhny Novgorod, Russia
The complex dynamics have been observed in the spectra of the electron cyclotron emission
of a nonequilibrium plasma created by powerful microwave radiation of gyrotron (37.5 GHz,
80 kW) under electron cyclotron resonance (ECR) conditions and confined in a tabletop mirror
trap [1, 2]. The dynamic spectrum of the emission is a set of highly chirped radiation bursts
with both increasing and decreasing frequencies which are repeated periodically. Such patterns
are not described in the frame of a quasilinear approach which is standard for the description
of a broadband plasma emission. From the other hand, the simultaneous observation of several
chirping bursts in the same frequency range is typical for the formation of nonlinear phase-space
structures in a proximity of the wave-particle resonances of a kinetically unstable plasma, also
known as the “holes and clumps” mechanism [3]. Our data provide the experimental evidence
for the spontaneous formation of self-consistent structures in the new frequency domain (a few
GHz) linked to the electron cyclotron frequency in a laboratory mirror-confined plasma.
The work is done in the frame of the RSF grant (project 17-72-10288).
References
[1] M.E. Viktorov, A.G. Shalashov, D.A. Mansfeld and S.V. Golubev, EPL 116, 55001 (2016)
[2] A.G. Shalashov, M.E. Viktorov, D.A. Mansfeld and S.V. Golubev, Phys. Plasmas 24, 032111 (2017)
[3] H.L. Berk, B.N. Breizman, N.V. Petviashvili, Phys. Lett. A 234, 213 (1997)
