The Radial Propagation of Heat in Strongly Driven Non-Equilibrium Fusion Plasmas
Heat transport is studied in strongly heated fusion plasmas, far from thermodynamic equilibrium. The radial propagation of perturbations is studied using a technique based on the transfer entropy. Three different magnetic confinement devices are studied, and similar results are obtained. “...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2019-02-01
|
| Series: | Entropy |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1099-4300/21/2/148 |
| _version_ | 1798034677212119040 |
|---|---|
| author | Boudewijn van Milligen Benjamin Carreras Luis García Javier Nicolau |
| author_facet | Boudewijn van Milligen Benjamin Carreras Luis García Javier Nicolau |
| author_sort | Boudewijn van Milligen |
| collection | DOAJ |
| description | Heat transport is studied in strongly heated fusion plasmas, far from thermodynamic equilibrium. The radial propagation of perturbations is studied using a technique based on the transfer entropy. Three different magnetic confinement devices are studied, and similar results are obtained. “Minor transport barriers„ are detected that tend to form near rational magnetic surfaces, thought to be associated with zonal flows. Occasionally, heat transport “jumps„ over these barriers, and this “jumping„ behavior seems to increase in intensity when the heating power is raised, suggesting an explanation for the ubiquitous phenomenon of “power degradation„ observed in magnetically confined plasmas. Reinterpreting the analysis results in terms of a continuous time random walk, “fast„ and “slow„ transport channels can be discerned. The cited results can partially be understood in the framework of a resistive Magneto-HydroDynamic model. The picture that emerges shows that plasma self-organization and competing transport mechanisms are essential ingredients for a fuller understanding of heat transport in fusion plasmas. |
| first_indexed | 2024-04-11T20:47:36Z |
| format | Article |
| id | doaj.art-d391c2ac8899452b9f0aa7200d79251c |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-04-11T20:47:36Z |
| publishDate | 2019-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-d391c2ac8899452b9f0aa7200d79251c2022-12-22T04:03:58ZengMDPI AGEntropy1099-43002019-02-0121214810.3390/e21020148e21020148The Radial Propagation of Heat in Strongly Driven Non-Equilibrium Fusion PlasmasBoudewijn van Milligen0Benjamin Carreras1Luis García2Javier Nicolau3Laboratorio Nacional de Fusión, CIEMAT, Av. Complutense 40, 28040 Madrid, SpainDepartamento de Física, Universidad Carlos III de Madrid, Av. de la Universidad 30, 28911 Leganés, Madrid, SpainDepartamento de Física, Universidad Carlos III de Madrid, Av. de la Universidad 30, 28911 Leganés, Madrid, SpainDepartamento de Física, Universidad Carlos III de Madrid, Av. de la Universidad 30, 28911 Leganés, Madrid, SpainHeat transport is studied in strongly heated fusion plasmas, far from thermodynamic equilibrium. The radial propagation of perturbations is studied using a technique based on the transfer entropy. Three different magnetic confinement devices are studied, and similar results are obtained. “Minor transport barriers„ are detected that tend to form near rational magnetic surfaces, thought to be associated with zonal flows. Occasionally, heat transport “jumps„ over these barriers, and this “jumping„ behavior seems to increase in intensity when the heating power is raised, suggesting an explanation for the ubiquitous phenomenon of “power degradation„ observed in magnetically confined plasmas. Reinterpreting the analysis results in terms of a continuous time random walk, “fast„ and “slow„ transport channels can be discerned. The cited results can partially be understood in the framework of a resistive Magneto-HydroDynamic model. The picture that emerges shows that plasma self-organization and competing transport mechanisms are essential ingredients for a fuller understanding of heat transport in fusion plasmas.https://www.mdpi.com/1099-4300/21/2/148magnetic confinement fusionturbulenceheat transport |
| spellingShingle | Boudewijn van Milligen Benjamin Carreras Luis García Javier Nicolau The Radial Propagation of Heat in Strongly Driven Non-Equilibrium Fusion Plasmas Entropy magnetic confinement fusion turbulence heat transport |
| title | The Radial Propagation of Heat in Strongly Driven Non-Equilibrium Fusion Plasmas |
| title_full | The Radial Propagation of Heat in Strongly Driven Non-Equilibrium Fusion Plasmas |
| title_fullStr | The Radial Propagation of Heat in Strongly Driven Non-Equilibrium Fusion Plasmas |
| title_full_unstemmed | The Radial Propagation of Heat in Strongly Driven Non-Equilibrium Fusion Plasmas |
| title_short | The Radial Propagation of Heat in Strongly Driven Non-Equilibrium Fusion Plasmas |
| title_sort | radial propagation of heat in strongly driven non equilibrium fusion plasmas |
| topic | magnetic confinement fusion turbulence heat transport |
| url | https://www.mdpi.com/1099-4300/21/2/148 |
| work_keys_str_mv | AT boudewijnvanmilligen theradialpropagationofheatinstronglydrivennonequilibriumfusionplasmas AT benjamincarreras theradialpropagationofheatinstronglydrivennonequilibriumfusionplasmas AT luisgarcia theradialpropagationofheatinstronglydrivennonequilibriumfusionplasmas AT javiernicolau theradialpropagationofheatinstronglydrivennonequilibriumfusionplasmas AT boudewijnvanmilligen radialpropagationofheatinstronglydrivennonequilibriumfusionplasmas AT benjamincarreras radialpropagationofheatinstronglydrivennonequilibriumfusionplasmas AT luisgarcia radialpropagationofheatinstronglydrivennonequilibriumfusionplasmas AT javiernicolau radialpropagationofheatinstronglydrivennonequilibriumfusionplasmas |