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Center for Nonlinear Studies |
The intense neutral beams are widely used for heating and diagnostics of fusion plasmas. The charge exchange with impurity ions results in emission of spectral lines in the visible range which is very convenient for measurements in tokamaks. Also, the induced electric field due to crossing of magnetic field lines splits spectral lines into Stark multiplets that can also be used for diagnostics. I will present the results of time-dependent and quasi-steady-state collisional-radiative (CR) modeling for a hydrogen beam penetrating fusion plasma. The contributions of different physical processes populating the excited states of impurity ions will be discussed. A new CR model based on parabolic quantum states and calculation of the relevant atomic data will be described in detail. Comparisons with the experimental data for motional Stark effect will be presented as well.
Host: James Colgan, T-1, 5-0291, jcolgan@lanl.gov