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| 001 | 827856 | ||
| 005 | 20240711113524.0 | ||
| 024 | 7 | _ | |a 10.1088/1741-4326/aa5ab7 |2 doi |
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| 082 | _ | _ | |a 530 |
| 100 | 1 | _ | |a Reiser, D. |0 P:(DE-Juel1)5017 |b 0 |e Corresponding author |u fzj |
| 245 | _ | _ | |a Drift-based scrape-off particle width in X-point geometry |
| 260 | _ | _ | |a Vienna |c 2017 |b IAEA |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a The Goldston heuristic estimate of the scrape-off layer width (Goldston 2012 Nucl. Fusion 52 013009) is reconsidered using a fluid description for the plasma dynamics. The basic ingredient is the inclusion of a compressible diamagnetic drift for the particle cross field transport. Instead of testing the heuristic model in a sophisticated numerical simulation including several physical mechanisms working together, the purpose of this work is to point out basic consequences for a drift-dominated cross field transport using a reduced fluid model. To evaluate the model equations and prepare them for subsequent numerical solution a specific analytical model for 2D magnetic field configurations with X-points is employed. In a first step parameter scans in high-resolution grids for isothermal plasmas are done to assess the basic formulas of the heuristic model with respect to the functional dependence of the scrape-off width on the poloidal magnetic field and plasma temperature. Particular features in the 2D-fluid calculations—especially the appearance of supersonic parallel flows and shock wave like bifurcational jumps—are discussed and can be understood partly in the framework of a reduced 1D model. The resulting semi-analytical findings might give hints for experimental proof and implementation in more elaborated fluid simulations. |
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| 773 | _ | _ | |a 10.1088/1741-4326/aa5ab7 |g Vol. 57, no. 4, p. 046011 - |0 PERI:(DE-600)2037980-8 |n 4 |p 046011 - |t Nuclear fusion |v 57 |y 2017 |x 1741-4326 |
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