| Spectroscopic measurement of molecular deuterium fluxes in the DIII-D edge (2006) | |||||||||||
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| INSTITUTE PHYSICS PUBLISHING Plasma Phys Control Fusion PLASMA PHYSICS AND CONTROLLED FUSION doi Spectroscopic measurement atomic and molecular deuterium uxes the DIII plasma edge Hollmann Brezinsek Brooks Groth McLean Pigarov and Rudakov University Institut California San Diego California USA Plasmaphysik Forschungszentrum lich lich Germany General Atomics San Diego California USA Lawrence Livermore National Laboratory Livermore California USA University Toronto UTIAS Toronto Canada Received April nal form June Published July Online stacks iop org PPCF Abstract Molecular deuterium uxes into the edge deuterium fuelled mode discharges are measured using passive visible spectroscopy emission lines Comparison with the atomic deuterium measured using emission suggests that signi cant fraction the plasma edge fuelling from the walls the form Molecular deuterium observed both the divertor and main chamber regions but roughly factor smaller near the inner main chamber wall and roughly factor smaller near the outer main chamber wall when compared with the divertor region Very high levels molecular excitation are measured with ground state rotational population temperatures Trot and vibrational population temperatures Tvib Comparisons between rotational population temperatures and the local electron density suggest that Trot can used reasonably good indicator electron density the line emission region recombining detached divertor operation estimates the enhanced volume recombination r | |||||||||||
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