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Fast calculation of the tokamak vertical instability
Plasma Physics and Controlled Fusion, 2022Abstract There has been recent interest in fast calculations of the tokamak axisymmetric vertical instability for real time feedback control purposes. It is shown that the maximum eigenvalue for the basic rigid version of this stability problem can be obtained by finding the positive root to a simple scalar function. This function can be
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On the Occurrence of Mathieu Instabilities of Vertical Cylinders
Volume 1: Offshore Technology, 2008Large offshore platforms with vertical circular cylindrical hull shapes have been designed and employed in recent times. Classical spar platforms and mono-column concepts are just two examples of designs with such simple configuration, supposed to perform limited motion responses in waves.
Marcelo A. S. Neves +6 more
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Instability of stratified fluid in a vertical cylinder
Journal of Fluid Mechanics, 1993In a previous paper we analysed the stability to small disturbances of stationary stratified fluid which is unbounded. Various forms of the undisturbed density distribution were considered, including a sinusoidal profile and a function of the vertical coordinate z which is constant outside a central horizontal layer.
Batchelor, G. K., Nitsche, J. M.
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Identification of Vertical Instabilities in the JET Tokamak
IEEE Transactions on Magnetics, 2008This paper deals with the electromagnetic aspects related to a series of experiments aimed at the identification and control of vertical instabilities in the JET Tokamak. The first part of the work is devoted to model the transient magnetic fields produced by the poloidal field circuits and the plasma edge localized modes (ELMs).
ALBANESE, Raffaele +4 more
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Convective instabilities in vertical fractures and faults
Journal of Geophysical Research: Solid Earth, 1979Natural convection of water contained in a vertical fracture or fault in which the temperature increases with depth is strongly influenced by the heat transport processes not only within the water itself but also by the heat transferred to and from the surrounding rock mass. The results of a linear stability analysis indicate that the critical Rayleigh
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Instability of a vertical rotation of a heavy body
Ukrainian Mathematical Journal, 1989This article is a continuation of recent articles by the author, e.g.: ibid. 40, No.2, 182-192 (1988; Zbl 0674.70011). The difference between our work and those articles is that we construct an exact solution of the initial nonlinear system corresponding to a nonperturbed motion. We also obtain conditions of the instability of such a solution.
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Control of the EHR plasma vertical instabilities
[Proceedings] The 14th IEEE/NPSS Symposium Fusion Engineering, 2002The author presents the conceptual design of the plasma vertical instability control system in the EHR (Experimental Hybrid Reactor). It has been demonstrated that the plasma-vacuum vessel-shell-active coil control system can stabilize the EHR plasma displacement in the vertical direction successfully.
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Vertical Structure of Midlatitude Mesoscale Instabilities
Journal of Physical Oceanography, 1988Abstract Instability processes in frontal jet regions outside the western boundary currents are examined for their ability to produce mesoscale variability comparable to that observed in the open ocean. The important of sufficient numerical resolution for a correct modeling of these processes is considered.
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