Ellipticity

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Sketch of tokamak geometry

The ellipticity refers to the shape of the poloidal cross section of the Last Closed Flux surface 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.
  • Zmax is the maximum value of Z along the LCFS or separatrix.
  • Zmin is the minimum value of Z along the LCFS or separatrix.
  • a is the minor radius of the plasma, defined as (Rmax - Rmin)/2.

The ellipticity is then defined as follows:

$ \kappa = (Z_{max}-Z_{min})/2a $

See also

References

  1. T.C. Luce, Plasma Phys. Control. Fusion 55 (2013) 095009