Facultatea de Fizică
Universitatea "Al.I.Cuza" Iaşi
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| Titlu: On the physical basis of the negative differential resistance which appears at ... |
| Autori: George Amarandei, Mihaela Mihai-Plugaru, Cezar Gaman, Mihaela Ivan, Erzilia Lozneanu,
Codrina Ionita1, Mihaela Dimitriu2, Dan-Gheorghe Dimitriu, Roman Schrittwieser1,
Mircea Sanduloviciu |
| Afiliere: Faculty of Physics, “Al. I. Cuza” University of Iasi, Romania
1Institute of Ion Physics, “Leopold-Franzens” University of Innsbruck, Austria
2”Ion Holban” School Group, Iasi, Romania |
| Abstract: Electron currents through magnetized plasma can excite nonlinear instabilities, as e.g. the potential relaxation instability and the electrostatic ion-cyclotron instability. The onset of these instabilities is often related with the appearance of a negative differential resistance in the static current – voltage characteristic. The interpretation of this phenomenon was linked with the limitation of the current due to the high amplitude oscillations. We report new experimental results which demonstrate that this negative differential resistance is the result of a nonlinear dynamics of a complex space charge structure in form of a double layer, which have place immediately before the onset of instabilities. After the onset of instabilities the differential resistance is positive. |
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