Dependence of particle transport on heating profiles in ASDEX upgrade

J. Stober; R. Dux; O. Gruber; L. Horton; P. Lang; R. Lorenzini; C. Maggi; F. Meo; R. Neu; J. M. Noterdaeme; A. Peeters; G. Pereverzev; F. Ryter; A. C.C. Sips; A. Stäbler; H. Zohm

doi:10.1088/0029-5515/43/10/030

Dependence of particle transport on heating profiles in ASDEX upgrade

J. Stober, R. Dux, O. Gruber, L. Horton, P. Lang, R. Lorenzini, C. Maggi, F. Meo, R. Neu, J. M. Noterdaeme, A. Peeters, G. Pereverzev, F. Ryter, A. C.C. Sips, A. Stäbler, H. Zohm

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40 Scopus citations

Abstract

The behaviour of the density profiles in ASDEX Upgrade can be described well with the assumption D ∝ χ and a pinch of the order of the neoclassical Ware pinch. The latter is estimated from slowly equilibrating density profiles. The assumption D ∝ χ has been successfully tested by varying the heat deposition profile, making use of on-/off-axis ICRH and ECRH: due to the generally observed self-similarity of the temperature profile, such variations in the heat flux profile have a strong effect on the χ-profile and on the D-profile if the above assumption is correct. The corresponding variations in the density profiles have indeed been observed. The model is also capable of describing the decay of the density profile after injecting a train of pellets. The anomalous transport of impurities is also increased with central heating, and the corresponding flattening of the density profile leads to a significant reduction of the neoclassical impurity pinch. Central ICR or ECR heating are therefore now routinely used to control density peaking and its negative effect on the stability of neoclassical tearing modes as well as to control the impurity transport in ASDEX Upgrade.

Original language	English
Pages (from-to)	1265-1271
Number of pages	7
Journal	Nuclear Fusion
Volume	43
Issue number	10
DOIs	https://doi.org/10.1088/0029-5515/43/10/030
State	Published - Oct 2003
Externally published	Yes

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title = "Dependence of particle transport on heating profiles in ASDEX upgrade",

abstract = "The behaviour of the density profiles in ASDEX Upgrade can be described well with the assumption D ∝ χ and a pinch of the order of the neoclassical Ware pinch. The latter is estimated from slowly equilibrating density profiles. The assumption D ∝ χ has been successfully tested by varying the heat deposition profile, making use of on-/off-axis ICRH and ECRH: due to the generally observed self-similarity of the temperature profile, such variations in the heat flux profile have a strong effect on the χ-profile and on the D-profile if the above assumption is correct. The corresponding variations in the density profiles have indeed been observed. The model is also capable of describing the decay of the density profile after injecting a train of pellets. The anomalous transport of impurities is also increased with central heating, and the corresponding flattening of the density profile leads to a significant reduction of the neoclassical impurity pinch. Central ICR or ECR heating are therefore now routinely used to control density peaking and its negative effect on the stability of neoclassical tearing modes as well as to control the impurity transport in ASDEX Upgrade.",

author = "J. Stober and R. Dux and O. Gruber and L. Horton and P. Lang and R. Lorenzini and C. Maggi and F. Meo and R. Neu and Noterdaeme, {J. M.} and A. Peeters and G. Pereverzev and F. Ryter and Sips, {A. C.C.} and A. St{\"a}bler and H. Zohm",

year = "2003",

month = oct,

doi = "10.1088/0029-5515/43/10/030",

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T1 - Dependence of particle transport on heating profiles in ASDEX upgrade

AU - Stober, J.

AU - Dux, R.

AU - Gruber, O.

AU - Horton, L.

AU - Lang, P.

AU - Lorenzini, R.

AU - Maggi, C.

AU - Meo, F.

AU - Neu, R.

AU - Noterdaeme, J. M.

AU - Peeters, A.

AU - Pereverzev, G.

AU - Ryter, F.

AU - Sips, A. C.C.

AU - Stäbler, A.

AU - Zohm, H.

PY - 2003/10

Y1 - 2003/10

N2 - The behaviour of the density profiles in ASDEX Upgrade can be described well with the assumption D ∝ χ and a pinch of the order of the neoclassical Ware pinch. The latter is estimated from slowly equilibrating density profiles. The assumption D ∝ χ has been successfully tested by varying the heat deposition profile, making use of on-/off-axis ICRH and ECRH: due to the generally observed self-similarity of the temperature profile, such variations in the heat flux profile have a strong effect on the χ-profile and on the D-profile if the above assumption is correct. The corresponding variations in the density profiles have indeed been observed. The model is also capable of describing the decay of the density profile after injecting a train of pellets. The anomalous transport of impurities is also increased with central heating, and the corresponding flattening of the density profile leads to a significant reduction of the neoclassical impurity pinch. Central ICR or ECR heating are therefore now routinely used to control density peaking and its negative effect on the stability of neoclassical tearing modes as well as to control the impurity transport in ASDEX Upgrade.

AB - The behaviour of the density profiles in ASDEX Upgrade can be described well with the assumption D ∝ χ and a pinch of the order of the neoclassical Ware pinch. The latter is estimated from slowly equilibrating density profiles. The assumption D ∝ χ has been successfully tested by varying the heat deposition profile, making use of on-/off-axis ICRH and ECRH: due to the generally observed self-similarity of the temperature profile, such variations in the heat flux profile have a strong effect on the χ-profile and on the D-profile if the above assumption is correct. The corresponding variations in the density profiles have indeed been observed. The model is also capable of describing the decay of the density profile after injecting a train of pellets. The anomalous transport of impurities is also increased with central heating, and the corresponding flattening of the density profile leads to a significant reduction of the neoclassical impurity pinch. Central ICR or ECR heating are therefore now routinely used to control density peaking and its negative effect on the stability of neoclassical tearing modes as well as to control the impurity transport in ASDEX Upgrade.

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JO - Nuclear Fusion

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Dependence of particle transport on heating profiles in ASDEX upgrade

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