dorsal/arxiv
View SchemaTurbulent particle transport in magnetized fusion plasma
| Authors | Clarisse Bourdelle, Tuong G. Hoang, Xavier Garbet |
|---|---|
| Categories | |
| ArXiv ID | physics/0410216 |
| URL | https://arxiv.org/abs/physics/0410216 |
| DOI | 10.1088/0741-3335/47/5A/023 |
Abstract
The understanding of the mechanisms responsible for particle transport is of the utmost importance for magnetized fusion plasmas. A peaked density profile is attractive to improve the fusion rate, which is proportional to the square of the density, and to self-generate a large fraction of non-inductive current required for continuous operation. Experiments in various tokamak devices (AUG, DIII-D, JET, TCV, TEXT, TFTR) have indicated the existence of an anomalous inward particle pinch. Recently, such an anomalous pinch has been unambiguously identified in Tore Supra very long discharges, in absence of toroidal electric field and of central particle source, for more than 4 minutes [1]. This anomalous particle pinch is predicted by a quasilinear theory of particle transport [2], and confirmed by non-linear turbulence simulations [3] and general considerations based on the conservation of motion invariants [4]. Experimentally, the particle pinch is found to be sensitive to the magnetic field gradient in many cases [5, 6, 7, 8], to the temperature profile [5, 9] and also to the collisionality that changes the nature of the microturbulence [10, 11, 12]. The consistency of some of the observed dependences with the theoretical predictions gives us a clearer understanding of the particle pinch in tokamaks, allowing us to predict more accurately the density profile in ITER.
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"abstract": "The understanding of the mechanisms responsible for particle transport is of\nthe utmost importance for magnetized fusion plasmas. A peaked density profile\nis attractive to improve the fusion rate, which is proportional to the square\nof the density, and to self-generate a large fraction of non-inductive current\nrequired for continuous operation. Experiments in various tokamak devices (AUG,\nDIII-D, JET, TCV, TEXT, TFTR) have indicated the existence of an anomalous\ninward particle pinch. Recently, such an anomalous pinch has been unambiguously\nidentified in Tore Supra very long discharges, in absence of toroidal electric\nfield and of central particle source, for more than 4 minutes [1]. This\nanomalous particle pinch is predicted by a quasilinear theory of particle\ntransport [2], and confirmed by non-linear turbulence simulations [3] and\ngeneral considerations based on the conservation of motion invariants [4].\nExperimentally, the particle pinch is found to be sensitive to the magnetic\nfield gradient in many cases [5, 6, 7, 8], to the temperature profile [5, 9]\nand also to the collisionality that changes the nature of the microturbulence\n[10, 11, 12]. The consistency of some of the observed dependences with the\ntheoretical predictions gives us a clearer understanding of the particle pinch\nin tokamaks, allowing us to predict more accurately the density profile in\nITER.",
"arxiv_id": "physics/0410216",
"authors": [
"Clarisse Bourdelle",
"Tuong G. Hoang",
"Xavier Garbet"
],
"categories": [
"physics.plasm-ph"
],
"doi": "10.1088/0741-3335/47/5A/023",
"title": "Turbulent particle transport in magnetized fusion plasma",
"url": "https://arxiv.org/abs/physics/0410216"
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