High confinement dissipative divertor operation on Alcator C-Mod

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

DOI:https://doi.org/10.1063/1.873447· OSTI ID:344925

Goetz, J A; LaBombard, B; Lipschultz, B; Pitcher, C S; Terry, J L; Boswell, C; Gangadhara, S; Pappas, D; Weaver, J; Welch, B; Boivin, R L; Bonoli, P; Fiore, C; Granetz, R; Greenwald, M; Hubbard, A; Hutchinson, I; Irby, J; Marmar, E; Mossessian, D ; Porkolab, M; Rice, J; Rowan, W L; Schilling, G; Snipes, J; Takase, Y; Wolfe, S; Wukitch, S ^[1]

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

Alcator C-Mod [I. H. Hutchinson {ital et al.}, Phys. Plasmas {bold 1}, 1511 (1994)] has operated a High-confinement-mode (H-mode) plasma together with a dissipative divertor and low core Z{sub eff}. The initially attached plasma is characterized by steady-state enhancement factor, H{sub ITER89P} [P. N. Yushmanov {ital et al.}, Nucl. Fusion {bold 30}, 1999 (1990)], of 1.9, central Z{sub eff} of 1.1, and a radiative fraction of {approximately}50{percent}. Feedback control of a nitrogen gas puff is used to increase radiative losses in both the core/edge and divertor plasmas in almost equal amounts. Simultaneously, the core plasma maintains H{sub ITER89P} of 1.6 and Z{sub eff} of 1.4 in this nearly 100{percent} radiative state. The power and particle flux to the divertor plates have been reduced to very low levels while the core plasma is relatively unchanged by the dissipative nature of the divertor. {copyright} {ital 1999 American Institute of Physics.}

• OSTI ID: 344925
• 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
FEEDBACK
OPERATION
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
TOKAMAK DEVICES