The effects of varying wall conditions, minor and major radii on confinement properties in ISX-B

Wootton, A. J.; Bush, C. E.; Edmonds, P.H.; Howe, H.C.; Lazarus, E. A.; H., C.; Murakami, M.; Neilson, G.H.

doi:10.1088/0029-5515/25/4/008

Cited by 11 publications

(12 citation statements)

References 19 publications

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“…Therefore, shifting the plasma to the high field side generally inhibits the transition to the RI mode regime despite the high radiation level (see also the detailed discussion in Refs [21,22]). Similar effects of the plasma position on confinement have also been observed in ISX-B [23].…”

Section: Understanding the Ri Modesupporting

confidence: 76%

“…It should be noted that in ASDEX [12] neon seeding and low gas feed rates were agents for allowing access from the SOC to the IOC and that in ISX-B it was possible to generate a density dependent scaling in auxiliary heated plasmas by either increased radiation or plasma position displacements [14]. An example of SOC-IOC transition in TEXTOR-94 achieved by gas feed control is shown in Fig.…”

Section: Confinement Of the Ri Modementioning

confidence: 99%

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Strong convexity of pressure for spin lattice systems

Nakhapetyan¹

1997

Russ. Math. Surv.

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The radiative improved (RI) mode is a tokamak regime offering many attractive reactor features. In the article, the RI mode of TEXTOR-94 is shown to follow the same scaling as the linear ohmic confinement regime and is thus identified as one of the most fundamental tokamak operational regimes. The current understanding derived from experiments and modelling of the conditions necessary for sustaining the mode is reviewed, as are the mechanisms leading to L-RI mode transition. The article discusses the compatibility of high impurity seeding with the low central power density of a burning reactor, as well as RI mode properties at and beyond the Greenwald density.

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Section: Understanding the Ri Modesupporting

confidence: 76%

Section: Confinement Of the Ri Modementioning

confidence: 99%

Strong convexity of pressure for spin lattice systems

Nakhapetyan¹

1997

Russ. Math. Surv.

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“…A dependence of particle confinement on plasma position was reported for ISX-B [26]. The particle source distribution was not observed in that experiment.…”

Section: Discussionmentioning

confidence: 69%

Global particle confinement in the Texas Experimental Tokamak

et al. 1987

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Particle transport in an ohmically heated tokamak plasma was investigated in the Texas Experimental Tokamak (TEXT). Spectroscopic measurements of the electron source were used with electron density measurements to derive particle confinement times from the continuity equation. Scalings were developed for particle confinement time with electron density, plasma current, toroidal field, and plasma positioning. Simultaneous measurement of electrostatic fluctuations with Langmuir probes may suggest a correlation between edge particle transport in TEXT and electrostatic turbulence. In addition, two major features of transport were isolated. First, transport is poloidally asymmetric at least in the plasma edge. Secondly, in some cases, the particle confinement scalings are closely associated with the scalings for recycling at particular surfaces. Similarities of the TEXT global particle confinement time scalings to those observed in other tokamaks may allow the conclusions of this work to be extended to other devices.

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“…Earlier studies in ISX-B showed, however, that some density dependence for rg in gettered discharges is restored by a careful positioning of the discharge [18] when TE is observed to approach the empirical value found in ungettered discharges and in gettered discharges with controlled neon puffing (the so-called Z-mode):…”

Section: Confinement In Gettered Dischargesmentioning

confidence: 99%

“…Figure 14 shows the normalized confinement data for beryllium gettered discharges, and Fig. 15 shows a corresponding plot of ISX-B data with titanium gettering [18]. There is no evidence to suggest that the effect of beryllium gettering on confinement is in any way different from the effects of titanium and chromium gettering.…”

Section: Confinement In Gettered Dischargesmentioning

confidence: 99%

The beryllium limiter experiment in ISX-B

Mioduszewski¹,

Edmonds²,

Bush³

et al. 1986

Nucl. Fusion

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An experiment to test beryllium as a limiter material has been performed in the ISX-B tokamak. The effect of the plasma on the limiter and the effect of the limiter on the plasma were studied in detail. Heat and particle fluxes to the limiter were measured, and limiter damage by melting was documented as a function of power flux. Strong melting and evaporation of the limiter caused beryllium gettering of the vacuum vessel. Postmortem analysis of the limiter was performed to document the amount of retained hydrogen and the erosion and impurity deposition on the limiter. The effect of the limiter on the plasma performance was studied in terms of parameter space, impurity content, and confinement for the ungettered and gettered cases. Operational experience with beryllium in a fusion experiment is discussed.

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The effects of varying wall conditions, minor and major radii on confinement properties in ISX-B

Cited by 11 publications

References 19 publications

Strong convexity of pressure for spin lattice systems

Strong convexity of pressure for spin lattice systems

Global particle confinement in the Texas Experimental Tokamak

The beryllium limiter experiment in ISX-B

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