omas.identify_cocos

omas.identify_cocos(B0, Ip, q, psi, clockwise_phi=None, a=None)[source]

Utility function to identify COCOS coordinate system If multiple COCOS are possible, then all are returned.

Parameters

  • B0 – toroidal magnetic field (with sign)

  • Ip – plasma current (with sign)

  • q – safety factor profile (with sign) as function of psi

  • psi – poloidal flux as function of psi(with sign)

  • clockwise_phi – (optional) [True, False] if phi angle is defined clockwise or not This is required to identify odd Vs even COCOS Note that this cannot be determined from the output of a code. An easy way to determine this is to answer the question: is positive B0 clockwise?

  • a – (optional) flux surfaces minor radius as function of psi This is required to identify 2*pi term in psi definition

Returns

list with possible COCOS