dorsal/arxiv
View SchemaTwo-fluid tokamak equilibria with reversed magnetic shear and sheared flow
| Authors | G. Poulipoulis, G. N. Throumoulopoulos, H. Tasso |
|---|---|
| Categories | |
| ArXiv ID | physics/0505101 |
| URL | https://arxiv.org/abs/physics/0505101 |
| DOI | 10.1017/S0022377806004673 |
Abstract
The aim of the present work is to investigate tokamak equilibria with reversed magnetic shear and sheared flow, which may play a role in the formation of internal transport barriers (ITBs), within the framework of two-fluid model. The study is based on exact self-consistent solutions in cylindrical geometry by means of which the impact of the magnetic shear, s, and the "toroidal" (axial) and "poloidal" (azimuthal) ion velocity components on the radial electric field, its shear and the shear of the ExB velocity is examined. For a wide parametric regime of experimental concern it turns out that the contributions of the toroidal and poloidal velocity and pressure gradient terms to the electric field, its shear and ExB velocity shear are of the same order of magnitude. The impact of s on ExB velocity shear through the pressure gradient term is stronger than that through the velocity terms. The results indicate that, alike MHD, the magnetic shear and the sheared toroidal and poloidal velocities act synergetically in producing electric fields and therefore ExB velocity shear profiles compatible with ones observed in discharges with ITBs; owing to the pressure gadient term, however, the impact of s on the electic field, its shear and the shear of ExB velocity is stronger than that in MHD.
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"abstract": "The aim of the present work is to investigate tokamak equilibria with\nreversed magnetic shear and sheared flow, which may play a role in the\nformation of internal transport barriers (ITBs), within the framework of\ntwo-fluid model. The study is based on exact self-consistent solutions in\ncylindrical geometry by means of which the impact of the magnetic shear, s, and\nthe \"toroidal\" (axial) and \"poloidal\" (azimuthal) ion velocity components on\nthe radial electric field, its shear and the shear of the ExB velocity is\nexamined. For a wide parametric regime of experimental concern it turns out\nthat the contributions of the toroidal and poloidal velocity and pressure\ngradient terms to the electric field, its shear and ExB velocity shear are of\nthe same order of magnitude. The impact of s on ExB velocity shear through the\npressure gradient term is stronger than that through the velocity terms. The\nresults indicate that, alike MHD, the magnetic shear and the sheared toroidal\nand poloidal velocities act synergetically in producing electric fields and\ntherefore ExB velocity shear profiles compatible with ones observed in\ndischarges with ITBs; owing to the pressure gadient term, however, the impact\nof s on the electic field, its shear and the shear of ExB velocity is stronger\nthan that in MHD.",
"arxiv_id": "physics/0505101",
"authors": [
"G. Poulipoulis",
"G. N. Throumoulopoulos",
"H. Tasso"
],
"categories": [
"physics.plasm-ph"
],
"doi": "10.1017/S0022377806004673",
"title": "Two-fluid tokamak equilibria with reversed magnetic shear and sheared flow",
"url": "https://arxiv.org/abs/physics/0505101"
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