CONVERGENCE LOOP

ETS updates input from different physics actors in a sequence, which is finished by solving the transport equations. Ther are possible none-linear couplings between different parts of the system. These nonelinearities are trited by the ETS using iterations.
The decision to step in time is made by the ETS based on the criteria that the maximum relative deviation of main plasma profiles is lower than some predefined tolerance.
There is a number of settings and sitches in the ETS that are used by the iterative scheme. To edit them do:

• right click on the box CONVERGENCE LOOP
• select Configure actor to edit settings
• choose your settings
• Commit

Switches in the field FREQUENCY OF CALLING THE PHYSICS ACTORS define how many times the the actors of a certain cathegory (equilibrium, transport, etc.) should be called in a single time step.
By selecting YES all actors of this cathegory will be called every iteration
By selecting NO all actors of this cathegory will be called only ones in a time step

Switches and parameters in the field CONTROL PARAMETERS define how iterations are done

• Tolerance - defines the maximum relative error of profiles change compared to previous iteration. If it is achieved the time steping is done.

For highly none-linear case the required precision can be achieved faster by the iterative scheme if only fraction of the new solution is mixed to the previous state.
The following scheme is adopted by the ets to reduce none-linearities in profiles, transport coefficients and sources:

Y = (Amix * Y+) + ((1-Amix)*Y-)

where Amix is the mixing fraction

You can activate the mixing of profiles, transport coefficient and sources by selecting the corresponding Mixing_fraction_... to be between [0:1]
You also can activate the authomatic ajustment of this fraction by selecting: Ajust_Mixing_for_... to YES