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Ellipticity: Difference between revisions
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Mention typical max kappa value
(added expression "elongation") |
m (Mention typical max kappa value) |
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The ellipticity is then defined as follows: | The ellipticity is then defined as follows: | ||
:<math> \kappa = (Z_{max}-Z_{min})/2a</math> | :<math> \kappa = (Z_{max}-Z_{min})/2a</math> | ||
Higher elongation is beneficial for fusion performance, but comes with increased vertical instability growth rate and thus increased risk of vertical displacement event (VDE) type disruptions.<ref>D.A. Humphreys, et al., ''Experimental vertical stability studies for ITER performance and design guidance'' [[doi:10.1088/0029-5515/49/11/115003|Nucl. Fusion '''49''' (2009) 115003]]</ref> | |||
Because of vertical stability constraints, <math>\kappa</math> is usually limited to a value close to about 1.8. | |||
== See also == | == See also == | ||