This title appears in the Scientific Report :
2003
Please use the identifier:
http://dx.doi.org/10.1088/0741-3335/45/9/313 in citations.
Please use the identifier: http://hdl.handle.net/2128/1799 in citations.
Characterization of ion heat conduction in JET and ASDEX Upgrade plasmas with and without internal transport barriers
Characterization of ion heat conduction in JET and ASDEX Upgrade plasmas with and without internal transport barriers
In ASDEX Upgrade and JET, the ion temperature profiles can be described by R/L-Ti which exhibits only little variations, both locally, when comparing different discharges, andradially over a wide range of the poloidal cross-section. Considering a change of the local ion heat flux of more than a fact...
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Personal Name(s): | Wolf, R. C. |
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Baranov, Y. / Garbet, X. / Hawkes, N. / Peters, A. G. / Challis, C. / de Baar, M. / Giroud, C. / Joffrin, E. / Mantsinen, M. / Mazon, D. / Meister, H. / Suttrop, W. / Zastrow, K. D. | |
Contributing Institute: |
Institut für Plasmaphysik; IPP |
Published in: | Plasma physics and controlled fusion, 45 (2003) S. 1757 - 1778 |
Imprint: |
Bristol
IOP Publ.
2003
|
Physical Description: |
1757 - 1778 |
DOI: |
10.1088/0741-3335/45/9/313 |
Document Type: |
Journal Article |
Research Program: |
Kernfusion und Plasmaforschung |
Series Title: |
Plasma Physics and Controlled Fusion
45 |
Subject (ZB): | |
Link: |
Get full text OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/1799 in citations.
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245 | |a Characterization of ion heat conduction in JET and ASDEX Upgrade plasmas with and without internal transport barriers | ||
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520 | |a In ASDEX Upgrade and JET, the ion temperature profiles can be described by R/L-Ti which exhibits only little variations, both locally, when comparing different discharges, andradially over a wide range of the poloidal cross-section. Considering a change of the local ion heat flux of more than a factor of two, this behaviour indicates some degree of profile stiffness. In JET, covering a large ion temperature range from 1 to 25 keV, the normalized ion temperature gradient, R/L-Ti, shows a dependence on the electron to ion temperature ratio or toroidal rotational shear. In particular, in hot ion plasmas, produced predominantly by neutral beam heating at low densities, in which large T-i/T-e is coupled to strong toroidal rotation, the effect of the two quantities cannot be distinguished. Both in ASDEX Upgrade and JET, plasmas with internal transport barriers (ITBs), including the PEP mode in JET, are characterized by a significant increase of R/L-Ti above the value of L- and H-mode plasmas. In agreement with previous ASDEX Upgrade results, no increase of the ion heat transport in reversed magnetic shear ITB plasmas is found in JET when raising the electron heating. Evidence is presented that magnetic shear directly influences R/L-Ti, namely decreasing the ion heat transport when going from weakly positive to negative magnetic shear. | ||
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