The role of particle sinks and sources in Alcator C-Mod detached divertor discharges

Journal Article · Sat May 01 04:00:00 EDT 1999 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.873448· OSTI ID:348157

Lipschultz, B; Terry, J L; Boswell, C; Goetz, J A; Hubbard, A E; Krasheninnikov, S I; LaBombard, B; Pappas, D A; Pitcher, C S; Wising, F; Wukitch, S ^[1]

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1. Massachusetts Institute of Technology, Plasma Science Fusion Center, Cambridge, Massachusetts 02139 (United States)

Detailed measurements of the magnitude and location of volumetric recombination occurring in the detached divertor of Alcator C-Mod tokamak [I. H. Hutchinson {ital et al.}, Phys. Plasmas {bold 1}, 1511 (1994)] are presented. The drop in divertor plate ion current during detachment is due to two mechanisms: (1) volumetric recombination in the divertor plasma; and (2) reductions in the divertor ion source. Depending on plasma conditions, each of these can be the primary mechanism for the observed ion current reduction in detachment. The ion source during detachment is inferred and its magnitude is consistent with the measured divertor power flow. A scaling of the density in the divertor recombining region for L- (low confinement) mode plasmas is found, n{sub e,r}{proportional_to}{bar n}{sub e}{number_sign}^{0.8{center_dot}P{sub SOL}{sup 2/7}. A model based on pressure variation along a flux surface during detachment is consistent with the main features of this scaling. {copyright} {ital 1999 American Institute of Physics.}}

• OSTI ID: 348157
• Report Number(s): CONF-981127--
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 6; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALCATOR DEVICE
DIVERTORS
ELECTRIC DISCHARGES
SCALING LAWS