نتایج جستجو برای: rotation mode
تعداد نتایج: 292919 فیلتر نتایج به سال:
In this study a series of ambient vibration tests on the triple ferrocement elevated water tanks with 150 cubic meters volume, is carried out. In order to verify the dynamic characteristics of full, half-full and one full tanks (mass eccentric system), the different arrangements of sensors are used. The effects of base rotation are also considered in the tests. Natural frequencies and mode shap...
DIII-D experiments show that the resistive wall mode (RWM) can remain stable in high β scenarios despite a low net torque from nearly balanced neutral beam injection (NBI) heating. The minimization of magnetic field asymmetries is essential for operation at the resulting low plasma rotation of less than 20 krad/s (measured with charge exchange recombination spectroscopy using C VI emission) cor...
Double-diffusive convection in a micropolar fluid layer heated and soluted from below in the presence of uniform rotation saturating a porous medium is theoretically investigated. An exact solution is obtained for a flat fluid layer contained between two free boundaries. To study the onset of convection, a linear stability analysis theory and normal mode analysis method have been used. For the ...
This paper deals with the theoretical investigation of the thermal instability of a thin layer of electrically conducting micropolar rotating fluid, heated from below in the presence of uniform vertical magnetic field in porous medium. A dispersion relation is obtained for a flat fluid layer, contained between two free boundaries using a linear stability analysis theory, and normal mode analysi...
In a second-order r-mode theory, Sá & Tomé found that the r-mode oscillation in neutron stars (NSs) could induce stellar differential rotation, which leads to a saturation state of the oscillation spontaneously. Based on a consideration of the coupling of the rmodes and the stellar spin and thermal evolutions, we carefully investigate the influences of the r-mode-induced differential rotation o...
Atomic spectroscopy can provide valuable information about fusion plasma. This is possible due to the fact that properties of radiated photons are governed by ion and electron velocity distributions and densities, electromagnetic fi elds, and ion species present in a plasma. Specifi cally, it can be used to calculate ion temperature and ion fl ow along magnetic fl ux surfaces in tokamaks called...
We study wave propagation in a rotating slow-light structure with mode degeneracy. The rotation, in conjunction with the mode degeneracy, effectively induces superstructure that significantly modifies the structure’s dispersion relation. It is shown that a rotation-dependent stop band is formed in the center of the slow-light waveguide transmission curve. A light signal of frequency within this...
Recently there has been widespread attention paid to rotation and momentum transport in tokamak plasmas. Of particular interest is spontaneous (intrinsic) toroidal rotation in plasmas without external momentum input. The strong co-current spontaneous rotation in enhanced confinement regimes, with ion thermal Mach numbers up to 0.3, may allow for resistive wall mode suppression in high-pressure ...
Impurity toroidal rotation has been observed in the centre of Alcator C-Mod ion cyclotron range of frequencies (ICRF) heated plasmas, from the Doppler shifts of argon X ray lines. Rotation velocities greater than 1.2×10 cm/s (ω = 200 krad/s) in the co-current direction have been observed in H mode discharges that had no direct momentum input. There is a correlation between the increase in the c...
Formation mechanism of toroidal rotation profile and characteristics of momentum transport in JT-60U
The diffusive term (the toroidal momentum diffusivity, ) and the non-diffusive term (the convection velocity, Vconv) of the momentum transport and the intrinsic rotation have been evaluated separately using the original transient momentum transport analysis. Thanks to the separation, characteristics of these terms are found for the first time as follows. (i) The characteristics of the momentum ...
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