Phys. Rev. Lett. 97, 184502 (2006) [4 pages]Experimental Evidence for Magnetorotational Instability in a Taylor-Couette Flow under the Influence of a Helical Magnetic FieldReceived 20 June 2006; published 1 November 2006 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. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.184502
DOI:
10.1103/PhysRevLett.97.184502
PACS:
47.20.−k, 91.25.Cw, 95.30.Qd
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