A non-statistical atomic model for beam emission and motional Stark effect diagnostics in fusion plasmas

作者：Ralchenko Yu^*; Marchuk O; Biel W; Schlummer T; Schultz D R; Stambulchik E

来源：Review of Scientific Instruments, 2012, 83(10): 10D504.

DOI：10.1063/1.4728093

In this work we analyze magnetic sublevel populations in a neutral beam penetrating a fusion plasma. The collisional-radiative model NOMAD was extended to include magnetic parabolic sublevels with principal quantum numbers n %26lt;= 10. The collisional parameters were calculated with the advanced atomic-orbital close coupling method and the Glauber approximation. The ionization by the induced electric field was also included in the model. The results of our calculations show significant deviations of the sublevel populations and, accordingly, line intensities of the sigma and pi components, from the statistical approximation. It is shown, for instance, that for a number of experimental conditions the total intensity of sigma components is not equal to the total intensity of pi components, which has a strong effect on determination of magnetic field and pitch angle in fusion devices. The results are presented for a wide range of plasma and beam parameters. The most significant deviations are observed for strong magnetic fields and high beam energies typical for the ITER plasma, where component intensity ratios may deviate by more than 20% from the statistical values.

• 出版日期2012-10