Triangularity: Difference between revisions
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* ''R<sub>lower</sub>'' is the major radius 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} = ( | :<math> \delta_{upper} = (R_{geo}-R_{upper})/a</math> | ||
and similar for δ<sub>lower</sub>. | and similar for δ<sub>lower</sub>. | ||
The overall triangularity is defined as the mean of δ<sub>upper</sub> and δ<sub>lower</sub>. | The overall triangularity is defined as the mean of δ<sub>upper</sub> and δ<sub>lower</sub>. |
Revision as of 14:23, 17 June 2014
The triangularity refers to the shape of the poloidal cross section of the Last Closed Flux surface (LCFS) or separatrix of a tokamak. Assuming[1]:
- Rmax is the maximum value of R along the LCFS or separatrix.
- Rmin is the minimum value of R along the LCFS or separatrix.
- Rgeo is the geometric major radius, defined as (Rmax + Rmin)/2.
- a is the minor radius of the plasma, defined as (Rmax - Rmin)/2.
- Rupper is the major radius of the highest vertical point of the LCFS.
- Rlower is the major radius of the lowest vertical point of the LCFS.
The upper triangularity is then defined as follows:
and similar for δlower. The overall triangularity is defined as the mean of δupper and δlower.
See also
References
- ↑ T.C. Luce, Plasma Phys. Control. Fusion 55 (2013) 095009