Life cycle of density structures in a simple magnetized torus

Details Life cycle of density structures in a simple magnetized torus Life cycle of density structures in a simple magnetized torus

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12j3013k&link_type=abstract

New Journal of Physics, Volume 12, Issue 10, pp. 103013 (2010).

Physics

1

Scientific paper

This paper presents an experimental investigation of spatio-temporal structures embedded in the low-frequency electrostatic fluctuations in a toroidal plasma device without rotational transform. The structures are extracted using the conditional averaging technique. The fundamental features and life cycle of the structures from their evolution to demise have been studied. The dipole structures formed rotate in poloidal cross-section with a propagation velocity of ~9×104 cm s-1. The direction of propagation is the same as the electron diamagnetic drift direction and the E×B rotation direction. We show that these structures evolve in two phases. In the first phase, the spatial extent and the measure of intensity of the structures increase considerably, indicating that ingestion of plasma is more than the loss to the limiter due to diffusion. In the second phase, decay of the structures begins. There are two time scales; the longer one precedes the shorter one. The decay is exponential, indicating that it is solely due to diffusion of plasma to the limiter. This indicates that what appears to be a perpetual periodicity-dominated time series actually consists of a series of large spatio-temporal structures having a definite life cycle of secular growth and decay phases. We interpret this result to mean that BETA plasma possesses a dynamic equilibrium in which the plasma oscillates between two non-equilibrium states.

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