Experimental confirmation of the standard magnetorotational instability mechanism with a spring-mass analogue

Hung, Derek M. H.; Blackman, Eric G.; Caspary, Kyle J.; Gilson, Erik P.; Ji, Hantao

doi:10.1038/s42005-018-0103-7

Title: Experimental confirmation of the standard magnetorotational instability mechanism with a spring-mass analogue

Journal Article · 13 January 2019 · Communications Physics

DOI: https://doi.org/10.1038/s42005-018-0103-7 · OSTI ID:1619699

Hung, Derek M. H.;

; Caspary, Kyle J.;

;

Abstract The magnetorotational instability (MRI) has long been considered a plausibly ubiquitous mechanism to destabilize otherwise stable Keplerian flows to support radially outward transport of angular momentum. Such an efficient transport process would allow fast accretion in astrophysical objects such as stars and black holes to release copious kinetic energy that powers many of the most luminous sources in the universe. But the standard MRI under a purely vertical magnetic field has heretofore never been directly measured despite numerous efforts over more than a decade. Here we report an unambiguous laboratory demonstration of the spring-mass analogue to the standard MRI by comparing motion of a spring-tethered ball within different rotating flows. The experiment corroborates the theory: efficient outward angular momentum transport manifests only for cases with a weak spring in quasi-Keperian flow. Our experimental method accomplishes this in a new way, thereby connecting solid and fluid mechanics to plasma astrophysics.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; AC02-09CH11466

OSTI ID:: 1619699

Journal Information:: Communications Physics, Journal Name: Communications Physics Journal Issue: 1 Vol. 2; ISSN 2399-3650

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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