What question did this study set out to answer?

To assess the effects of substituting heavy-element molybdenum limiters with light-element aluminium rail limiters on tokamak plasma confinement and composition.

October 1, 1976Nuclear Fusion

Aluminium limiter experiment in ST tokamak

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To assess the effects of substituting heavy-element molybdenum limiters with light-element aluminium rail limiters on tokamak plasma confinement and composition.
Installed interchangeable aluminium rail limiters at the top, bottom, and outside positions of the ST tokamak while keeping a fixed molybdenum rail on the inside.
Compared discharges utilizing aluminium limiters directly against preceding and succeeding discharges operated with standard molybdenum limiters in hydrogen and helium gases.
Aluminium limiter discharges raised central electron temperature (Te) by a factor of 1.4 to 2 and increased electron energy confinement by a factor of 2 to 3 compared to molybdenum discharges.
Molybdenum contamination decreased significantly and oxygen fell from 4–8% to negligible levels, while aluminium accounted for approximately 3–5% of the plasma.
Plasma effective charge (Zeff) derived from resistivity rose by 20–30%, while net electrical resistance decreased due to the elevated central electron temperature.

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Implication

Experimental study demonstrates increased electron temperature and energy confinement in tokamak discharges using aluminium limiters, suggesting improved radial current distribution.

Cite This Study

Meservey et al. (1976) studied this question.

synapsesocial.com/papers/6a6f80d55d37378ac1dc9056 https://doi.org/10.1088/0029-5515/16/4/004

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Implication

Experimental study demonstrates increased electron temperature and energy confinement in tokamak discharges using aluminium limiters, suggesting improved radial current distribution.

Aluminium limiter experiment in ST tokamak

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Aluminium limiter experiment in ST tokamak

Key Points

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Implication

Cite This Study

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