RädlerFest: Alpha Effect and Beyond

Session

Session 3

14 Feb 2011, 14:00

Wenner-Gren Center, floor 7, Hörsalen (Wenner Gren Center)

255. Recent and future liquid metal experiments on cosmic magnetic fields

Dr Frank Stefani

14/02/2011, 14:00

At the end of 1999, the Riga and Karlsruhe experiments sounded the bell for a period of significant experimental effort to simulate the origin and the action of cosmic magnetic fields. With the main focus on our own activities, we summarize the recent liquid metal experiments on the dynamo effect and related magnetic instabilities, and we delineate our plans for a large scale sodium...

256. Experimental measurement of turbulent magnetic diffusivity

Prof. Peter Frick (Institute of Continuous Media Mechanics)

14/02/2011, 14:45

The first direct measurements of effective magnetic diffusivity in turbulent flow of electro-conductive fluids (the so-called beta-effect) under magnetic Reynolds number Rm >> 1 are reported. The measurements are performed in a nonstationary turbulent flow of liquid sodium, generated in a closed toroidal channel. The peak level of the Reynolds number reached ${\rm Re} \approx 3 \cdot...