Stellarator equilibria with reactor relevant energetic particle losses
| Autor: | B. J. Faber, Michael Drevlak, Aaron Bader, Konstantin Likin, J.C. Schmitt, David G. Anderson, Joseph Talmadge, Chris Hegna |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Journal of Plasma Physics. 85 |
| ISSN: | 1469-7807 0022-3778 |
| Popis: | Stellarator configurations with reactor relevant energetic particle losses are constructed by simultaneously optimizing for quasisymmetry and an analytically derived metric ( $\unicode[STIX]{x1D6E4}_{c}$ ), which attempts to align contours of the second adiabatic invariant, $J_{\Vert }$ with magnetic surfaces. Results show that with this optimization scheme it is possible to generate quasihelically symmetric equilibria on the scale of ARIES-CS which completely eliminate all collisionless alpha particle losses within normalized radius $r/a=0.3$ . We show that the best performance is obtained by reducing losses at the trapped–passing boundary. Energetic particle transport can be improved even when neoclassical transport, as calculated using the metric $\unicode[STIX]{x1D716}_{\text{eff}}$ , is degraded. Several quasihelically symmetric equilibria with different aspect ratios are presented, all with excellent energetic particle confinement. |
| Databáze: | OpenAIRE |
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