Triangularity: Difference between revisions

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* ''R<sub>0</sub>'' is the major radius of the midpoint of the 2 intersections of the LCFS or separatrix with the equatorial plane (''Z'' = 0).
* ''R<sub>0</sub>'' is the major radius of the midpoint of the 2 intersections of the LCFS or separatrix with the equatorial plane (''Z'' = 0).
* ''a'' is the minor radius of the plasma, defined as the radial difference between the 2 intersections of the LCFS or separatrix with the equatorial plane (''Z'' = 0), divided by 2.
* ''a'' is the minor radius of the plasma, defined as the radial difference between the 2 intersections of the LCFS or separatrix with the equatorial plane (''Z'' = 0), divided by 2.
* ''R<sub>upper</sub>'' is the major radius of the upper X-point (in case it exists) or of the highest vertical point of the LCFS.
* ''R<sub>upper</sub>'' is the major radius of the highest vertical point of the LCFS.
* ''R<sub>lower</sub>'' is the major radius of the lower X-point (in case it exists) or of the lowest vertical point of the LCFS.
* ''R<sub>lower</sub>'' is the major radius of the lowest vertical point of the LCFS.
The upper triangularity is then defined as follows:
The upper triangularity is then defined as follows:
:<math> \delta_{upper} = (R_0-R_{upper})/a</math>
:<math> \delta_{upper} = (R_0-R_{upper})/a</math>

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