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16 April 2024 |
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Magneto-Rayleigh-Taylor instability driven by a rotating magnetic field: Cylindrical liner configuration | | Shu-Chao Duan
; Long Yang
; Bo Xiao
; Ming-Xian Kan
; Gang-Hua Wang
; Wei-Ping Xie
; | | Date: |
24 Nov 2017 | | Abstract: | It was previously difficult to use the equilibrium Z-pinch as a
magnetic-confinement fusion system owing to unavoidable exchange or
quasi-exchange mode instability; however, the development of pulsed power
technology and the dynamic Z-pinch has led to renewed interest in the Z-pinch
for fusion applications. In a dynamic Z-pinch system, magneto-Rayleigh-Taylor
(MRT) instability is inevitable due to implosion of the plasma driven by the
magnetic pressure. MRT instability develops along with other modes of
instability, but it grows much faster and is the most dangerous instability
undermining pinch symmetry. We propose to use a directional time-varying
(rotating) driven magnetic field to suppress MRT instability in a dynamic
Z-pinch. A finite thickness cylindrical liner configuration was studied. A
rotational drive magnetic field is equivalent to two magnetic field components,
Theta and Z, that alternate in time, referred to as an alternant Theta-Z-pinch
configuration. The maximum e-folding number at stagnation of the dominant mode
of an optimized alternant Theta-Z-pinch is significantly lower than that of the
standard Theta- or Z-pinch and the instability is completely stabilized at a
certain thickness. Directional rotation of the magnetic field is independent of
the finite thickness: these parameters cooperate and enhance the suppressing
effect. The finite thickness effect appears only when the magnetic field is
time-varying in orientation and there is no reflection in the standard Theta-
or Z-pinch. Because MRT instability can be well suppressed in this way, the
alternant Theta-Z-pinch configuration has potential applications in liner
inertial fusion. | | Source: | arXiv, 1711.8891 | | Services: | Forum | Review | PDF | Favorites | |
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