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Differences in the H-mode pedestal width of temperature and density
| Content Provider | Scilit |
|---|---|
| Author | Schneider, P. A. Wolfrum, E. Groebner, R. J. Osborne, T. H. Beurskens, M. N. A. Dunne, M. G. Ferron, J. R. Günter, S. Kurzan, B. Lackner, K. Snyder, P. B. Zohm, H. |
| Copyright Year | 2012 |
| Description | Journal: Plasma Physics and Controlled Fusion A pedestal database was built using data from type-I ELMy H-modes of ASDEX Upgrade, DIII-D and JET. ELM synchronized pedestal data were analysed with the two-line method. The two-line method is a bilinear fit which shows better reproducibility of pedestal parameters than a modified hyperbolic tangent fit. This was tested with simulated and experimental data. The influence of the equilibrium reconstruction on pedestal parameters was investigated with sophisticated reconstructions from CLISTE and EFIT including edge kinetic profiles. No systematic deviation between the codes could be observed. The flux coordinate system is influenced by machine size, poloidal field and plasma shape. This will change the representation of the width in different coordinates, in particular, the two normalized coordinates $Ψ_{N}$ and r/a show a very different dependence on the plasma shape. The scalings derived for the pedestal width, Δ, of all machines suggest a different scaling for the electron temperature and the electron density. Both cases show similar dependence with machine size, poloidal magnetic field and pedestal electron temperature and density. The influence of ion temperature and toroidal magnetic field is different on each of and . In dimensionless form the density pedestal width in $Ψ_{N}$ scales with , the temperature pedestal width with . Both widths also show a strong correlation with the plasma shape. The shape dependence originates from the coordinate transformation and is not visible in real space. The presented scalings predict that in ITER the temperature pedestal will be appreciably wider than the density pedestal. |
| Related Links | http://iopscience.iop.org/article/10.1088/0741-3335/54/10/105009/pdf |
| ISSN | 07413335 |
| e-ISSN | 13616587 |
| DOI | 10.1088/0741-3335/54/10/105009 |
| Journal | Plasma Physics and Controlled Fusion |
| Issue Number | 10 |
| Volume Number | 54 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2012-08-31 |
| Access Restriction | Open |
| Subject Keyword | Journal: Plasma Physics and Controlled Fusion Nuclear Energy and Engineering Electron Density Electron Temperature Magnetic Field Coordinate Transformation Coordinate System |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Nuclear Energy and Engineering |
