نتایج جستجو برای: rotation mode
تعداد نتایج: 292919 فیلتر نتایج به سال:
Central toroidal rotation and impurity transport coe cients have been determined in Alcator C-Mod Ohmic High Con nement Mode (H-mode) plasmas from observations of x-ray emission following impurity injection. Rotation velocities up to 3 10 m/s in the co-current direction have been observed in the center of the best Ohmic H-mode plasmas. Purely Ohmic H-mode plasmas display many characteristics si...
We investigate the launching and stability of extragalactic jets through nonlinear magnetohydrodynamic (MHD) simulation and linear eigenmode analysis. In the simulations of jet evolution, a small-scale equilibrium magnetic arcade is twisted by a differentially rotating accretion disk. These simulations produce a collimated outflow which is unstable to the current driven m = 1 kink mode for low ...
Intrinsic core toroidal rotation has been observed in I-mode plasmas from the Alcator C-Mod tokamak, and is found to be very similar to the rotation in H-mode discharges, both in its edge origin, profile shape and in the scaling with global plasma pressure. Since Iand H-mode plasmas have similar pedestal temperature gradients, but completely different edge density profiles, it may be concluded ...
We introduce ring lasers with continuous π-phase shifts in the second order distributed feedback grating. This configuration facilitates insights into the nature of the modal outcoupling in an optical cavity. The grating exploits the asymmetry of whispering gallery modes and induces a rotation of the far field pattern. We find that this rotation can be connected to the location of the mode rela...
The dynamics and stability of the resistive wall mode (RWM) are investigated in the JT-60U high-β plasmas, and the sustainment of high-β plasmas above the ideal no-wall β-limit βno-wall N has been demonstrated using a plasma rotation. To suppress an n = 1 RWM that limits the achievable βN in the regime βN > βno-wall N , the plasma rotation is kept larger than the critical rotation. Therefore, w...
It is found that the rotation of the Poynting vector of a Laguerre-Gaussian laser mode is proportional to the Gouy phase and for most cases of interest, rotates through less than one revolution in reaching the far field. For a p=O mode, we show the expression for the rotation is particularly simple and independent of 1. At the radius corresponding to maximum intensity, it yields a rotation of o...
The design of retaining walls depends on the magnitude of active pressure exerted from the backfill. Therefore, estimating the scale of this pressure is a fundamental factor in the design. In this study, to assess the active earth pressure, a rigid retaining wall was built capable of translating and/or rotating with adjustable speed. Further, several physical tests were conducte...
Application of lower hybrid RF (LHRF) waves can induce both coand countercurrent directed changes in toroidal rotation in Alcator C-Mod plasmas, depending on the target plasma current, electron density, confinement regime and magnetic shear. For Ohmic L-mode discharges with good core LH wave absorption, and significant current drive, the interior (r/a<0.5) rotation increments (on a time scale o...
Intrinsic rotation has been observed in I-mode plasmas from the C-Mod tokamak, and is found to be similar to that in H mode, both in its edge origin and in the scaling with global pressure. Since both plasmas have similar edge ∇T, but completely different edge ∇n, it may be concluded that the drive of the intrinsic rotation is the edge ∇T rather than ∇P. Evidence suggests that the connection be...
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