A hybrid Rayleigh-Taylor-current-driven coupled instability in a magnetohydrodynamically collimated cylindrical plasma with lateral gravity
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Applied Physics; California Institute of Technology
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Applied Physics
Here we present an MHD theory of Rayleigh-Taylor instability on the surface of a magnetically confined cylindrical plasma flux rope in a lateral external gravity field. The Rayleigh-Taylor instability is found to couple to the classic current-driven instability, resulting in a new type of hybrid instability that cannot be described by either of the two instabilities alone. The lateral gravity breaks the axisymmetry of the system and couples all azimuthal modes together. The coupled instability, produced by combination of helical magnetic field, curvature of the cylindrical geometry, and lateral gravity, is fundamentally different from the classic magnetic Rayleigh-Taylor instability occurring at a two-dimensional planar interface. The theory successfully explains the lateral Rayleigh-Taylor instability observed in the Caltech plasma jet experiment [Moser and Bellan, Nature 482, 379 (2012)]. Finally, potential applications of the theory include magnetic controlled fusion, solar emerging flux, solar prominences, coronal mass ejections, and other space and astrophysical plasma processes.
- Research Organization:
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
- Grant/Contract Number:
- FG02-04ER54755; SC0010471
- OSTI ID:
- 1468770
- Alternate ID(s):
- OSTI ID: 1242862
OSTI ID: 22599026
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 23; ISSN PHPAEN; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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