Scaling of the power exhaust channel in Alcator C-Mod

B. Labombard; J.L. Terry; J.W. Hughes; D. Brunner; J. Payne; M.L. Reinke; I. Cziegler; R. Granetz; M. Greenwald; I.H. Hutchinson; J. Irby; Y. Lin; B. Lipschultz; Y. Ma; E.S. Marmar; N. Tsujii; G. Wallace; D.G. Whyte; S. Wolfe; S. Wukitch; A.C.-M. Team; W.L. Rowan; G. Wurden

doi:10.1063/1.3566059

Scaling of the power exhaust channel in Alcator C-Mod

B. Labombard, J.L. Terry, J.W. Hughes, D. Brunner, J. Payne, M.L. Reinke, I. Cziegler, R. Granetz, M. Greenwald, I.H. Hutchinson, J. Irby, Y. Lin, B. Lipschultz, Y. Ma, E.S. Marmar, N. Tsujii, G. Wallace, D.G. Whyte, S. Wolfe, S. WukitchA.C.-M. Team, W.L. Rowan, G. Wurden

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Parametric dependences of the heat flux footprint on the outer divertor target plate are explored in EDA H-mode and ohmic L-mode plasmas over a wide range of parameters with attached plasma conditions. Heat flux profile shapes are found to be independent of toroidal field strength, independent of power flow along magnetic field lines and insensitive to x-point topology (single-null versus double-null). The magnitudes and widths closely follow that of the upstream pressure profile, which are correlated to plasma thermal energy content and plasma current. Heat flux decay lengths near the strike-point in H- and L-mode plasmas scale approximately with the inverse of plasma current, with a diminished dependence at high collisionality in L-mode. Consistent with previous studies, pressure gradients in the boundary scale with plasma current squared, holding the magnetohydrodynamic ballooning parameter approximately invariant at fixed collisionality-strong evidence that critical-gradient transport physics plays a key role in setting the power exhaust channel.

Original language	English
Journal	Physics of Plasmas
Volume	18
Issue number	5
DOIs	https://doi.org/10.1063/1.3566059
Publication status	Published - 1 May 2011

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Labombard, B., Terry, J. L., Hughes, J. W., Brunner, D., Payne, J., Reinke, M. L., Cziegler, I., Granetz, R., Greenwald, M., Hutchinson, I. H., Irby, J., Lin, Y., Lipschultz, B., Ma, Y., Marmar, E. S., Tsujii, N., Wallace, G., Whyte, D. G., Wolfe, S., ... Wurden, G. (2011). Scaling of the power exhaust channel in Alcator C-Mod. Physics of Plasmas, 18(5). https://doi.org/10.1063/1.3566059

@article{3d78eed77fa3403783c65246820867bf,

title = "Scaling of the power exhaust channel in Alcator C-Mod",

abstract = "Parametric dependences of the heat flux footprint on the outer divertor target plate are explored in EDA H-mode and ohmic L-mode plasmas over a wide range of parameters with attached plasma conditions. Heat flux profile shapes are found to be independent of toroidal field strength, independent of power flow along magnetic field lines and insensitive to x-point topology (single-null versus double-null). The magnitudes and widths closely follow that of the upstream pressure profile, which are correlated to plasma thermal energy content and plasma current. Heat flux decay lengths near the strike-point in H- and L-mode plasmas scale approximately with the inverse of plasma current, with a diminished dependence at high collisionality in L-mode. Consistent with previous studies, pressure gradients in the boundary scale with plasma current squared, holding the magnetohydrodynamic ballooning parameter approximately invariant at fixed collisionality-strong evidence that critical-gradient transport physics plays a key role in setting the power exhaust channel.",

author = "B. Labombard and J.L. Terry and J.W. Hughes and D. Brunner and J. Payne and M.L. Reinke and I. Cziegler and R. Granetz and M. Greenwald and I.H. Hutchinson and J. Irby and Y. Lin and B. Lipschultz and Y. Ma and E.S. Marmar and N. Tsujii and G. Wallace and D.G. Whyte and S. Wolfe and S. Wukitch and A.C.-M. Team and W.L. Rowan and G. Wurden",

year = "2011",

month = may,

day = "1",

doi = "10.1063/1.3566059",

language = "English",

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Labombard, B, Terry, JL, Hughes, JW, Brunner, D, Payne, J, Reinke, ML, Cziegler, I, Granetz, R, Greenwald, M, Hutchinson, IH, Irby, J, Lin, Y, Lipschultz, B, Ma, Y, Marmar, ES, Tsujii, N, Wallace, G, Whyte, DG, Wolfe, S, Wukitch, S, Team, AC-M, Rowan, WL & Wurden, G 2011, 'Scaling of the power exhaust channel in Alcator C-Mod', Physics of Plasmas, vol. 18, no. 5. https://doi.org/10.1063/1.3566059

TY - JOUR

T1 - Scaling of the power exhaust channel in Alcator C-Mod

AU - Labombard, B.

AU - Terry, J.L.

AU - Hughes, J.W.

AU - Brunner, D.

AU - Payne, J.

AU - Reinke, M.L.

AU - Cziegler, I.

AU - Granetz, R.

AU - Greenwald, M.

AU - Hutchinson, I.H.

AU - Irby, J.

AU - Lin, Y.

AU - Lipschultz, B.

AU - Ma, Y.

AU - Marmar, E.S.

AU - Tsujii, N.

AU - Wallace, G.

AU - Whyte, D.G.

AU - Wolfe, S.

AU - Wukitch, S.

AU - Team, A.C.-M.

AU - Rowan, W.L.

AU - Wurden, G.

PY - 2011/5/1

Y1 - 2011/5/1

N2 - Parametric dependences of the heat flux footprint on the outer divertor target plate are explored in EDA H-mode and ohmic L-mode plasmas over a wide range of parameters with attached plasma conditions. Heat flux profile shapes are found to be independent of toroidal field strength, independent of power flow along magnetic field lines and insensitive to x-point topology (single-null versus double-null). The magnitudes and widths closely follow that of the upstream pressure profile, which are correlated to plasma thermal energy content and plasma current. Heat flux decay lengths near the strike-point in H- and L-mode plasmas scale approximately with the inverse of plasma current, with a diminished dependence at high collisionality in L-mode. Consistent with previous studies, pressure gradients in the boundary scale with plasma current squared, holding the magnetohydrodynamic ballooning parameter approximately invariant at fixed collisionality-strong evidence that critical-gradient transport physics plays a key role in setting the power exhaust channel.

AB - Parametric dependences of the heat flux footprint on the outer divertor target plate are explored in EDA H-mode and ohmic L-mode plasmas over a wide range of parameters with attached plasma conditions. Heat flux profile shapes are found to be independent of toroidal field strength, independent of power flow along magnetic field lines and insensitive to x-point topology (single-null versus double-null). The magnitudes and widths closely follow that of the upstream pressure profile, which are correlated to plasma thermal energy content and plasma current. Heat flux decay lengths near the strike-point in H- and L-mode plasmas scale approximately with the inverse of plasma current, with a diminished dependence at high collisionality in L-mode. Consistent with previous studies, pressure gradients in the boundary scale with plasma current squared, holding the magnetohydrodynamic ballooning parameter approximately invariant at fixed collisionality-strong evidence that critical-gradient transport physics plays a key role in setting the power exhaust channel.

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SN - 1070-664X

VL - 18

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

ER -

Scaling of the power exhaust channel in Alcator C-Mod

Abstract

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