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Scaling law: Difference between revisions
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* make performance comparisons between devices | * make performance comparisons between devices | ||
* make educated guesses at local transport mechanisms | * make educated guesses at local transport mechanisms | ||
== General method == | == General method == | ||
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The main performance parameter that is subjected to scaling law analysis is the [[Energy confinement time|energy confinement time]], τ<sub>E</sub>. | The main performance parameter that is subjected to scaling law analysis is the [[Energy confinement time|energy confinement time]], τ<sub>E</sub>. | ||
The following are some of the most-used scalings for tokamaks: | The following are some of the most-used scalings for tokamaks: | ||
<ref>[http://dx.doi.org/10.1088/0029-5515/39/12/301 ITER Physics Expert Groups on Confinement Modelling and Transport, Confinement Modelling and Database, and ITER Physics Basis Editors, Nucl. Fusion '''39''' (1999) 2137]</ref> | <ref name="ITER">[http://dx.doi.org/10.1088/0029-5515/39/12/301 ITER Physics Expert Groups on Confinement Modelling and Transport, Confinement Modelling and Database, and ITER Physics Basis Editors, Nucl. Fusion '''39''' (1999) 2137]</ref> | ||
* L-mode scaling (H<sub>89P</sub>) | * L-mode scaling (H<sub>89P</sub>) | ||
* ELMy H-mode scaling (H<sub>H98</sub>(y,2)) | * ELMy H-mode scaling (H<sub>H98</sub>(y,2)) | ||
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Assuming quasi-neutrality, the relevant scaling laws can be cast into dimensionless forms that involve only three plasma parameters (apart from geometrical factors): | Assuming quasi-neutrality, the relevant scaling laws can be cast into dimensionless forms that involve only three plasma parameters (apart from geometrical factors): | ||
<ref name="ITER"/> | |||
<ref>B.B. Kadomtsev, Sov. J. Plasma Phys. '''1''' (1975)295</ref> | <ref>B.B. Kadomtsev, Sov. J. Plasma Phys. '''1''' (1975)295</ref> | ||