Alfvenic propagation: a key to nonlocal effects in magnetized plasmas
| Autor: | Sattin, F., Escande, D. F. |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Physical Review Letters 112, 095003 (2014) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.112.095003 |
| Popis: | A long standing puzzle in fusion research comes from experiments where a sudden peripheral electron temperature perturbation is accompanied by an almost simultaneous opposite change in central temperature, in a way incompatible with local transport models. This paper shows these experiments and similar ones are fairly well quantitatively reproduced, when induction effects are incorporated in the total plasma response, alongside standard local diffusive transport, as suggested in earlier work [V.D. Pustovitov, Plasma Phys. Control. Fusion {\bf 54}, 124036 (2012)]. Comment: After the publication of the paper we became aware of a fundamental error in the normalization of our equations. While at some places, plasma pressure was normalized to the magnetic energy density, at other places, plasma pressure and the plasma pressure source were normalized to the {\it equilibrium} plasma pressure. This involves that a $\beta$ factor was missing in some of the equations. By an unfortunate coincidence the different sources of error largely masked each other in the final results, thereby allowing the model to provide seemingly accurate conclusions. The correction of this error implies that the alleged MHD effects are smaller by a factor $\beta$, and cannot account for the phenomenology observed. This invalidates our conclusions |
| Databáze: | arXiv |
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