dorsal/arxiv
View SchemaNon-linear temperature oscillations in the plasma centre on Tore Supra and their interplay with MHD
| Authors | V. S. Udintsev, G. Giruzzi, F. Imbeaux, J. -F. Artaud, X. Garbet, G. Huysmans, P. Maget, J. -L. Segui, A. Becoulet, G. T. Hoang, E. Joffrin, X. Litaudon, B. Saoutic, The Tore Supra Team |
|---|---|
| Categories | |
| ArXiv ID | physics/0410180 |
| URL | https://arxiv.org/abs/physics/0410180 |
Abstract
Regular oscillations of the central electron temperature have been observed by means of ECE and SXR diagnostics during non-inductively driven discharges on Tore Supra. These oscillations are sustained by LHCD, do not have a helical structure and, therefore, cannot be ascribed as MHD phenomena. The most probable explanation of this oscillating regime (O-regime) is the assumption that the plasma current density (and, thus, the q-profile) and the electron temperature evolve as a non-linearly coupled predator-pray system. The integrated modelling code CRONOS has been used to demonstrate that the coupled heat transport and resistive diffusion equations admit solutions for the electron temperature and the current density which have a cyclic behaviour. Recent experimental results in which the O-regime co-exists with MHD modes will be presented. Because both phenomena are linked to details of the q-profile, some interplay between MHD and oscillations may occur. The localisation of magnetic islands allows to obtain an accurate picture of the q-profile in the plasma core. In some case, MHD-driven reconnection helps in maintaining a weakly inverted q-profile that is found to be, in the CRONOS simulations, a necessary condition to trigger the oscillations.
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"abstract": "Regular oscillations of the central electron temperature have been observed\nby means of ECE and SXR diagnostics during non-inductively driven discharges on\nTore Supra. These oscillations are sustained by LHCD, do not have a helical\nstructure and, therefore, cannot be ascribed as MHD phenomena. The most\nprobable explanation of this oscillating regime (O-regime) is the assumption\nthat the plasma current density (and, thus, the q-profile) and the electron\ntemperature evolve as a non-linearly coupled predator-pray system. The\nintegrated modelling code CRONOS has been used to demonstrate that the coupled\nheat transport and resistive diffusion equations admit solutions for the\nelectron temperature and the current density which have a cyclic behaviour.\nRecent experimental results in which the O-regime co-exists with MHD modes will\nbe presented. Because both phenomena are linked to details of the q-profile,\nsome interplay between MHD and oscillations may occur. The localisation of\nmagnetic islands allows to obtain an accurate picture of the q-profile in the\nplasma core. In some case, MHD-driven reconnection helps in maintaining a\nweakly inverted q-profile that is found to be, in the CRONOS simulations, a\nnecessary condition to trigger the oscillations.",
"arxiv_id": "physics/0410180",
"authors": [
"V. S. Udintsev",
"G. Giruzzi",
"F. Imbeaux",
"J. -F. Artaud",
"X. Garbet",
"G. Huysmans",
"P. Maget",
"J. -L. Segui",
"A. Becoulet",
"G. T. Hoang",
"E. Joffrin",
"X. Litaudon",
"B. Saoutic",
"The Tore Supra Team"
],
"categories": [
"physics.plasm-ph"
],
"title": "Non-linear temperature oscillations in the plasma centre on Tore Supra and their interplay with MHD",
"url": "https://arxiv.org/abs/physics/0410180"
},
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