Spectroscopic analysis of normal and reversed ion flows in the DIII-D divertor

Journal Article · Mon Feb 01 04:00:00 EST 1999 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.873198· OSTI ID:295520

Isler, R C ^[1]; Brooks, N H; West, W P; Leonard, A W ^[2]; McKee, G R ^[3]; Porter, G D ^[4]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8072 (United States)
2. General Atomics, San Diego, California 92186-5068 (United States)
3. University of Wisconsin, Madison, Wisconsin 53706-1687 (United States)
4. Lawrence Livermore National Laboratory, Livermore, California 95540 (United States)

Flow velocities of C{sup +}, C{sup 2+}, B{sup +}, and D{sup +} parallel to the magnetic field in the DIII-D [J. Luxon, P. Anderson, F. Batty {ital et al.}, {ital Plasma Physics Controlled Nuclear Fusion Research}, Proceedings of the 11th International Conference, Tokyo, 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. I, p. 159] divertor have been measured from Doppler shifts of spectral lines. In general, both normal flows (toward the target plate) and reversed flows (away from the target plate) are observed in the outer scrape-off layer with the reversed flows occurring near the separatrix. Following the transition from attached to partially detached conditions, normal flow velocities generally speed up while in some regions reversed flows are observed to slow down. In high density plasmas, deuteron velocities are reflected in Balmer line emission which originates mainly from atoms which have thermalized by charge exchange or which have been formed by recombination. Low-temperature areas of nearly stagnated deuteron flow have been observed. In these regions recombination should be efficient for neutralizing the divertor plasma. {copyright} {ital 1999 American Institute of Physics.}

• OSTI ID: 295520
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 6; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BALMER LINES
CHARGE EXCHANGE
DIVERTORS
DOPPLER EFFECT
HYDROGEN
PLASMA DIAGNOSTICS
PLASMA IMPURITIES
RECOMBINATION
TOKAMAK DEVICES