To use the ion temperature, either from a UFILE (PRETI2/EXTTI2) or defined as an analytic profile, set NLTIPRO=T. In order to instruct TRANSP to use the provided profile, users also need to set NLTI2=T. If this file is not provided, or if NLTI2=F, TRANSP will rescale the ion temperature from the electron temperature, as:
Ti= GIEFAC x Te
The general dependency is:
Ti(used) = (1 - FIEFAC) (GIEFAC x Te) + FIEFAC x Ti(input)
Thus, if NLTI2=T and the default values FIEFAC=1, GIEFAC=1 are used, Ti(used)=Ti(input).
Both FIEFAC and GIEFAC can be made time dependent by using a UFILE, PREFIE/EXTFIE, PREGIE/EXTGIE.
Ion temperature profile data may not cover the plasma edge and/or the plasma core. The following parameters can be used to adjust data in this case:
- TIXLIM
- maximum value of normalized radius (r/a) where data are valid.
- TIFACX
- ratio Ti/Te at the edge.
- TIDXSW
- a linear transition between data and TIFACX*TTe is performed in the interval [TIXLIM, TIXLIM+TIDXSW]. The default value is 0.05.
- TIXLIM0
- innermost value of normalized radius where the input Ti data are valid. At this radius the difference TDIFF=Ti-Teis evaluated.
- TIDXSW0
- In the interval [TIXLIM0-TIDXSW0,TIXLIM0] a linear transition between TIFACX0*TDIFF and input data is performed.
- TIFACX0
- For x≤(TIXLIM0-TIDXSW0) the ion temperature is Ti=Te + TIFACX0*Tdiff.
If the measured temperature is actually an impurity ion temperature (for example from Carbon line), then the additional flag needs to be set: NLTI2TX=T (see here documentation on how to deal with input impurity ion temperature).