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:
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
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