Accumulation of impurities in advanced scenarios

R. Dux; C. Giroud; R. Neu; A. G. Peeters; J. Stober; K. D. Zastrow

doi:10.1016/S0022-3115(02)01508-8

Accumulation of impurities in advanced scenarios

R. Dux, C. Giroud, R. Neu, A. G. Peeters, J. Stober, K. D. Zastrow

Research output: Contribution to journal › Conference article › peer-review

56 Scopus citations

Abstract

Impurity behaviour in advanced scenarios at ASDEX Upgrade and JET has been investigated. For ASDEX Upgrade improved H-mode plasmas at δ=0.35, accumulation of tungsten and metallic impurities was observed inside r/a=0.3 in cases with weak central heating. Central ECRH suppressed the accumulation by increasing the anomalous diffusion and by flattening the profile of the main plasma density which reduces neoclassical inward convection for the impurities. These effects are well described by impurity transport simulation and calculated v/D values agree with the measurements within a factor of 2. In JET reversed shear discharges with internal transport barriers, metallic impurities accumulate in cases with too strong peaking of the density profile. The peaking increases with the impurity charge and is low for the low-Z elements C and Ne as expected from neoclassical convection.

Original language	English
Pages (from-to)	1150-1155
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	313-316
Issue number	SUPPL.
DOIs	https://doi.org/10.1016/S0022-3115(02)01508-8
State	Published - Mar 2003
Externally published	Yes
Event	Plasma - Surface Interactions in Controlled Fusion Devices - Gifu, Japan Duration: 26 May 2002 → 31 May 2002

Keywords

Advanced scenarios
Impurity accumulation
Impurity transport
Neoclassical transport

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10.1016/S0022-3115(02)01508-8

Cite this

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title = "Accumulation of impurities in advanced scenarios",

abstract = "Impurity behaviour in advanced scenarios at ASDEX Upgrade and JET has been investigated. For ASDEX Upgrade improved H-mode plasmas at δ=0.35, accumulation of tungsten and metallic impurities was observed inside r/a=0.3 in cases with weak central heating. Central ECRH suppressed the accumulation by increasing the anomalous diffusion and by flattening the profile of the main plasma density which reduces neoclassical inward convection for the impurities. These effects are well described by impurity transport simulation and calculated v/D values agree with the measurements within a factor of 2. In JET reversed shear discharges with internal transport barriers, metallic impurities accumulate in cases with too strong peaking of the density profile. The peaking increases with the impurity charge and is low for the low-Z elements C and Ne as expected from neoclassical convection.",

keywords = "Advanced scenarios, Impurity accumulation, Impurity transport, Neoclassical transport",

author = "R. Dux and C. Giroud and R. Neu and Peeters, {A. G.} and J. Stober and Zastrow, {K. D.}",

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note = "Plasma - Surface Interactions in Controlled Fusion Devices ; Conference date: 26-05-2002 Through 31-05-2002",

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T1 - Accumulation of impurities in advanced scenarios

AU - Dux, R.

AU - Giroud, C.

AU - Neu, R.

AU - Peeters, A. G.

AU - Stober, J.

AU - Zastrow, K. D.

PY - 2003/3

Y1 - 2003/3

N2 - Impurity behaviour in advanced scenarios at ASDEX Upgrade and JET has been investigated. For ASDEX Upgrade improved H-mode plasmas at δ=0.35, accumulation of tungsten and metallic impurities was observed inside r/a=0.3 in cases with weak central heating. Central ECRH suppressed the accumulation by increasing the anomalous diffusion and by flattening the profile of the main plasma density which reduces neoclassical inward convection for the impurities. These effects are well described by impurity transport simulation and calculated v/D values agree with the measurements within a factor of 2. In JET reversed shear discharges with internal transport barriers, metallic impurities accumulate in cases with too strong peaking of the density profile. The peaking increases with the impurity charge and is low for the low-Z elements C and Ne as expected from neoclassical convection.

AB - Impurity behaviour in advanced scenarios at ASDEX Upgrade and JET has been investigated. For ASDEX Upgrade improved H-mode plasmas at δ=0.35, accumulation of tungsten and metallic impurities was observed inside r/a=0.3 in cases with weak central heating. Central ECRH suppressed the accumulation by increasing the anomalous diffusion and by flattening the profile of the main plasma density which reduces neoclassical inward convection for the impurities. These effects are well described by impurity transport simulation and calculated v/D values agree with the measurements within a factor of 2. In JET reversed shear discharges with internal transport barriers, metallic impurities accumulate in cases with too strong peaking of the density profile. The peaking increases with the impurity charge and is low for the low-Z elements C and Ne as expected from neoclassical convection.

KW - Advanced scenarios

KW - Impurity accumulation

KW - Impurity transport

KW - Neoclassical transport

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VL - 313-316

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JF - Journal of Nuclear Materials

IS - SUPPL.

T2 - Plasma - Surface Interactions in Controlled Fusion Devices

Y2 - 26 May 2002 through 31 May 2002

ER -

Accumulation of impurities in advanced scenarios

Abstract

Keywords

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