At certain values of the edge rotational transform ιa , the confinement quality of plasmas in the Wendelstein 7-AS (W7-AS) stellarator is found to react very sensitively to small modifications of the edge rotational transform ιa . As ιa can be reproducibly changed either by external fields or by a small plasma current, these transitions offer a precise way to systematically analyse differences ...

Sexually immature rainbow trout were acclimated to small volume (1 m) holding tanks, then exposed to short term stress to examine the relationship between feeding, stress, plasma ghrelin levels and other plasma stress parameters. Plasma ghrelin levels showed an increase 24 h after a single feed, plasma lactate and glucose levels fell over the same period and plasma cortisol levels were low and ...

Unstable fluctuations develop in the initially quiescent plasma in the improved confinement mode of the H-1 heliac when the radial electric field (Er) shear exceeds some critical value. These unstable Er shear-driven modes are shown to generate zonal-flow-like poloidally symmetric potential structures, similar to those generated in the low confinement mode (Shats M G and Solomon W M 2002 Phys. ...

In this article the effects of different engineering parameters of rf-driven ion sources with an external spiral antenna and a quartz rf window are studied. This article consists of three main topics: the effect of source geometry on the operation gas pressure, the effect of source materials and magnetic confinement on extracted current density and ion species, and the effect of different anten...

The effect of isoeugenol sedation (2.5 mg l ) on plasma cortisol, glucose, and lactate dynamics in channel catfish (Ictalurus punctatus), relative to two controls, was examined during confinement, exposure to high unionized ammonia, and acute oxygen depletion. The positive control (PC) for each treatment was no sedation, and the negative control (NC) was sedation with metomidate hydrochloride (...

We present a collocation method to obtain the approximate solution of Troesch's problem which arises in the confinement of a plasma column by radiation pressure and applied physics. By using the Christov rational functions and collocation points, this method transforms Troesch's problem into a system of nonlinear algebraic equations. The rate of convergence is shown to be exponential. The numer...

The creation of the first small-Debye length, low temperature pure electron plasmas in a stellarator is reported. A confinement time of 20 ms has been measured. The long confinement time implies the existence of macroscopically stable equilibria and that the single particle orbits are well confined despite the lack of quasisymmetry in the device, the Columbia non-neutral torus. This confirms th...