Speaker
Dmitry Mansfeld
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/O3.J401.pdf
Observation of CW to pulsed mode transition of cyclotron maser emission
from magnetic mirror
D. A. Mansfeld1, A. G. Shalashov1, E. D. Gospodchikov1,
I. V. Izotov1, V. A. Skalyga1, O. Tarvainen2
1
Institute of Applied Physics Russian Academy of Sciences, Nizhny Novgorod, Russia
2
Department of Physics, University of Jyvaskyla, Jyvaskyla, Finland
The first experimental evidence of the controlled transition from the generation of periodic
bursts of electromagnetic emission into continuous wave (CW) regime of a cyclotron maser
formed in magnetically confined non-equilibrium plasmas is reported. The approach to the
transition to CW regime, which requires fine tuning of the magnetic field, was found
experimentally. From a theoretic point of view [1], the observed transition is related to the
Poincare–Andronov–Hopf bifurcation: a stationary point attributed to CW generation
becomes unstable through the birth of a stable limit cycle. The kinetic cyclotron instability of
the extraordinary wave of weakly inhomogeneous magnetized plasma is driven by the
anisotropic electron population resulting from electron cyclotron plasma heating in
MHD-stable minimum-B open magnetic trap. Except being of fundamental interest in the
context of space cyclotron masers in planet magnetospheres and other astrophysical objects,
our results are important for applications, in particular for the development of ECR ion
sources.
[1] http://arxiv.org/abs/1712.06700
