title: Experimental evidence for magnetorotational instability in a Taylor-Couette flow under the influence of a helical magnetic field.
abstract: A recent Letter [R. Hollerbach and G. Rüdiger, Phys. Rev. Lett. 95, 124501 (2005)] has shown that the threshold for the onset of the magnetorotational instability in a Taylor-Couette flow is dramatically reduced if both axial and azimuthal magnetic fields are imposed. In agreement with this prediction, we present results of a Taylor-Couette experiment with the liquid metal alloy GaInSn, showing evidence for the existence of the magnetorotational instability at Reynolds numbers of order 1000 and Hartmann numbers of order 10.
authors.affiliation: Forschungszentrum Rossendorf, P.O. Box 510119, D-01314 Dresden, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Stefani
authors.forename: Thomas
authors.initials: T
authors.lastname: Gundrum
authors.forename: Gunter
authors.initials: G
authors.lastname: Gerbeth
authors.forename: Günther
authors.initials: G
authors.lastname: Rüdiger
authors.forename: Manfred
authors.initials: M
authors.lastname: Schultz
authors.forename: Jacek
authors.initials: J
authors.lastname: Szklarski
authors.forename: Rainer
authors.initials: R
authors.lastname: Hollerbach