Sawtooth Period Simulations of TCV discharges
The 1-D transport code PRETOR is used to simulate TCV discharges. The discharges studied in this work are all ohmic L-modes and cover a very wide range of plasma and shape parameters. The code PRETOR also has a sawtooth crash model which was used to predict ITER sawtooth period. It turns out that TCV is in the same collisionality regimes as ITER, with regard to the sawtooth crash criterion.b Therefore PRETOR can be used to model TCV sawtooth periods in order to obtain more accurate q profiles and better transport simulations. In doing so, the limits and the range of validity of the sawtooth model are tested. The crash model involves several conditions, but for TCV ohmic discharges , the decisive criterion is that the effective growth rate of the internal kink must be larger than some fraction of the diamagnetic frequencies. It is shown that the crash criterion allows one to model the sawtooth activity for all the ohmic L-modes shots considered. For transport analysis, setting is sufficient as then only the sawtooth period is not currently determined, but the inversion radius and the profiles are good.
Bibliographic Reference: Article: Theory of Fusion Plasmas, (1999), 403-408
Record Number: 199910869 / Last updated on: 1999-06-25
Original language: en
Available languages: en