NDEFINE=2

With this option the density profile for selected thermal ion species can be either specified in a UFILE or defined as a fraction of the electron density, by defining the namelist variable FRAC_NDEFINE2(ig).

The list of input UFILES for the density profile of the thermal ion density species is listed below:

• PRENIH/EXTNIH - for hydrogen
• PRENID/EXTNID - for deuterium
• PRENIT/EXTNIT - for tritium
• PRENI3/EXTNI3 - for He3
• PRENI4/EXTNI4 - for He4
• PRENI6/EXTNI6 - for Lithium

NOTE: when the ion density profiles are input to TRANSP, it is important to ensure that they are consistent with other input data, like electron density and Z_eff at all times, otherwise TRANSP will return errors from the solution of quasi-neutrality.

Gasflow and recycling sources should to be provided even when thermal ion profiles are prescribed with NDEFINE=2, since they are still used in the solution of the particle balance equation.