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| Titel |
The Karlsruhe Dynamo Experiment |
| VerfasserIn |
U. Müller, R. Stieglitz |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 9, no. 3/4 ; Nr. 9, no. 3/4, S.165-170 |
| Datensatznummer |
250006534
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| Publikation (Nr.) |
 copernicus.org/npg-9-165-2002.pdf |
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| Zusammenfassung |
| It has been shown
theoretically in the past that homogeneous dynamos may occur in
electrically conducting fluids for various vortical velocity fields.
Roberts (1972) investigated spatially periodic, infinitely extended fields
of vortices which Busse (1978, 1992) confined to a finite cylindrical
domain. Based on Busse's vortex arrangement a conceptual design for an
experimental homogeneous dynamo has been developed and a test facility was
setup at the Forschungszentrum Karlsruhe. The first experiments
demonstrated that permanent dynamo action can be generated in a
cylindrical container filled with liquid sodium in which by means of guide
tubes counterrotating and countercurrent spiral vortices are established.
The dynamo is self-exciting and the magnetic field saturates at a mean
value for fixed super-critical flow rates. The instantaneous magnetic
field fluctuates around this mean value by an order of about 5%. As
predicted by theory the mode of the observed magnetic field is non-axisymmetric.
In a series of experiments a phase- and a bifurcation diagram has been
derived as a function of the spiral and axial flow rates. |
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