Strong transport reduction in the helical core of the reversed-field pinch
| Autor: | P. Piovesan, Alberto Alfier, D. Terranova, Federica Bonomo, Gianluca Spizzo, Roberto Pasqualotto, S.V. Annibaldi, P. Buratti |
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| Rok vydání: | 2007 |
| Předmět: |
Physics
Guiding center Tokamak ACTIVE MHD CONTROL Reversed field pinch Condensed matter physics Transport coefficient CONFINEMENT Condensed Matter Physics law.invention Thermal conductivity SINGLE-HELICITY law Heat transfer Pinch Magnetohydrodynamics Atomic physics ELECTRON-TEMPERATURE MEASUREMENTS RFX |
| Zdroj: | Physics of plasmas 14 (2007): 112515. doi:10.1063/1.2811933 info:cnr-pdr/source/autori:S. V. Annibaldi; F. Bonomo; R. Pasqualotto; G. Spizzo; A. Alfier; P. Buratti; P. Piovesan; D. Terranova/titolo:Strong transport reduction in the helical core of the reversed-field pinch/doi:10.1063%2F1.2811933/rivista:Physics of plasmas/anno:2007/pagina_da:112515/pagina_a:/intervallo_pagine:112515/volume:14 |
| DOI: | 10.1063/1.2811933 |
| Popis: | An explanation of the strong heating observed in the core of a reversed-field pinch in the quasi-single-helicity state is presented. A magnetic island is formed, in which the heat transport coefficient is much smaller than in the surrounding chaotic sea, because of the formation of well defined magnetic surfaces. The values of the thermal conductivity obtained with the M1TEV [F. Porcelli , Phys. Rev. Lett 82, 1458 (1999)] two-dimensional transport code are in very good agreement with the estimates of the ion diffusion coefficient inside the island, given by a Hamiltonian guiding center code. Moreover, the values of thermal conductivity are in the tokamak range, and are consistent with the peak temperatures measured in the Reversed Field eXperiment [P. Sonato , Fusion Eng. Des. 66-68, 161 (2003)] at Consorzio RFX, Padova, Italy. The effect of the island width and the different powers deposited inside the island on the final temperature peak are also investigated. (C) 2007 American Institute of Physics. |
| Databáze: | OpenAIRE |
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