Speaker
Giuseppe Castro
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.4010.pdf
Time-characterization of RF/X-ray bursts during a Cyclotron Instability
in Simple Mirror and B-minimum Traps
D. Mascali1, J. Angot2, G. Castro1, A. Galatà,3 S. Gammino1, M. Giarrusso1, F.
Leone4,5,1, M. Mazzaglia1, R. Miracoli6, E. Naselli4,1, G. Torrisi1
1 Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud,
Catania, 95123 - ITALY
2 Univ. Grenoble Alpes, CNRS, Grenoble INP*, LPSC-IN2P3, 38000 Grenoble, France
* Institute of Engineering Univ. Grenoble Alpes
3 Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro,
Legnaro (PD) - Italy
4 Università di Catania, Dipartimento di Fisica e Astronomia, Sezione Astrofisica,
Via S. Sofia 78, I-95123 Catania, Italy
5 INAF—Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania, Italy
6 ESS - Bilbao, Bilbao, Spain
A Cyclotron-type instability has been observed at INFN-LNS on an axis-symmetric plasma
trap based on a Simple Mirror configuration, where the plasma is sustained via 4 and 7 GHz
Electron Cyclotron Resonance heating, and at the LPSC in Grenoble, in a B-minimum trap
operating at 14 GHz. The Radio and X-ray bursts produced by the unstable plasma have
been characterized in a time resolved way: a) Radio-signals detected along and across the
magnetic axis have been measured in a timescale <100 ns via 80 Gs/s, 20 GHz band scope;
a dedicated wavelet analysis shows the inner-plasma self-generation of waves far from the
pumping frequency; b) fast Germanium detectors provide the evolution of the X-rays
emitted axially and radially, allowing time-resolved spectroscopy; typical observed X-ray
bursts lie in the timescales of ms or tens of ms, depending on the mirror ratio, and are
emitted by the plasma few ms after the RF ones. Both RF and X-ray signals can be ranked
on a temporal sequence which provides the whole characterization of the instability.
Implications on laboratory plasma physics and astrophysical plasmas will be discussed.
