Abstract
The atomic orbital close coupling approach has been used to compute a comprehensive data set for proton-impact excitation of atomic hydrogen owing to the need for complete data for motional Stark effect spectroscopy of fusion plasmas enabled by neutral beam injection.
Highlights
Fusion plasma diagnostics such as charge exchange recombination spectroscopy, beam emission spectroscopy, and motional Stark effect spectroscopy, can determine parameters such as field strength, temperature, density, and magnetic field orientation and are of great importance
The data needed for such modeling underpinning motional Stark effect (MSE) diagnostics, the subject of the present work, includes the density matrix elements for excitation of atomic hydrogen by plasma protons, fusion alpha particles, and ions of the most significant impurities, beryllium and carbon
Corroboration of this method of averaging the results from the pairs of basis sets comes from supporting calculations made using the lattice, time-dependent Schrödinger equation (LTDSE) method [10]. This method is in principal more accurate and more controllably convergent than the present atomic orbital close coupling (AOCC) approach, but requires a much greater computational effort and has not to this point been practical for such comprehensive calculations
Summary
Fusion plasma diagnostics such as charge exchange recombination spectroscopy, beam emission spectroscopy, and motional Stark effect spectroscopy, can determine parameters such as field strength, temperature, density, and magnetic field orientation and are of great importance These diagnostics, in turn, depend critically on the existence and accuracy of atomic data for charge transfer and excitation. As a contribution to the IAEA Coordinated Research Program on data for light ions, comprehensive atomic orbital close coupling (AOCC) calculations for H+ + H were made These calculations were needed to be able to cover the entire relevant collision energy range (400 eV to 2 MeV) with a fine energy mesh spacing that was not available from data in the literature, but because the collisional-radiative modeling of the MSE required calculation of the density matrix elements, which were essentially completely lacking.
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