4 research outputs found
Electromagnetic Fluctuations during Fast Reconnection in a Laboratory Plasma
Clear evidence for a positive correlation is established between the
magnitude of magnetic fluctuations in the lower-hybrid frequency range and
enhancement of reconnection rates in a well-controlled laboratory plasma. The
fluctuations belong to the right-hand polarized whistler wave branch,
propagating obliquely to the reconnecting magnetic field, with a phase velocity
comparable to the relative drift velocity between electrons and ions. The short
coherence length and large variation along the propagation direction indicate
their strongly nonlinear nature in three dimensions.Comment: 4 pages, 6 figures, submitted to Phys. Rev. Let
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Development of the Megahertz Planar Laser-induced Fluorescence Diagnostic for Plasma Turbulence Visualization
A megahertz LIF-based diagnostic system for measuring ion density fluctuations in two spatial dimensions is described. Well resolved spatial and temporal 2D images of turbulent structures will be useful in understanding ion turbulence in magnetically confined plasmas which is a key factor in the performance of fusion experimental devices. A sheet beam of a megahertz repetition rate tunable Alexandrite laser is used to excite ion emission from argon plasma. The fluorescence emitted from the plane of the laser beam is detected with a narrow band interference filter and intensified ultra-fast CCD camera providing 2D images of relative ion density fluctuations every microsecond. It is expected that the edge plasma on fusion devices will be accessible to this technique
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Experimental Verification of the Hall Effect during Magnetic Reconnection in a Laboratory Plasma
In this letter we report a clear and unambiguous observation of the out-of-plane quadrupole magnetic field suggested by numerical simulations in the reconnecting current sheet in the Magnetic Reconnection Experiment (MRX). Measurements show that the Hall effect is large in collisionless regime and becomes small as the collisionality increases, indicating that the Hall effect plays an important role in collisionless reconnection