The pellet rocket effect in magnetic confinement fusion plasmas
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866913620020953088 |
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| author | Guth, Nico J. Vallhagen, Oskar Helander, Per Pusztai, Istvan Newton, Sarah L. Fülöp, Tünde |
| author_facet | Guth, Nico J. Vallhagen, Oskar Helander, Per Pusztai, Istvan Newton, Sarah L. Fülöp, Tünde |
| contents | Pellets of frozen material travelling into a magnetically confined fusion plasma are accelerated by the so-called pellet rocket effect. The non-uniform plasma heats the pellet ablation cloud asymmetrically, producing pressure-driven, rocket-like propulsion of the pellet. We present a semi-analytical model of this process by perturbing a spherically symmetric ablation model. Predicted pellet accelerations match experimental estimates in current tokamaks ($\sim 10^5 \;\rm m/s^2$). Projections for ITER high-confinement scenarios ($\sim 10^6 \;\rm m/s^2$) indicate significantly shorter pellet penetration than expected without this effect, which could limit the effectiveness of disruption mitigation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_15080 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The pellet rocket effect in magnetic confinement fusion plasmas Guth, Nico J. Vallhagen, Oskar Helander, Per Pusztai, Istvan Newton, Sarah L. Fülöp, Tünde Plasma Physics Pellets of frozen material travelling into a magnetically confined fusion plasma are accelerated by the so-called pellet rocket effect. The non-uniform plasma heats the pellet ablation cloud asymmetrically, producing pressure-driven, rocket-like propulsion of the pellet. We present a semi-analytical model of this process by perturbing a spherically symmetric ablation model. Predicted pellet accelerations match experimental estimates in current tokamaks ($\sim 10^5 \;\rm m/s^2$). Projections for ITER high-confinement scenarios ($\sim 10^6 \;\rm m/s^2$) indicate significantly shorter pellet penetration than expected without this effect, which could limit the effectiveness of disruption mitigation. |
| title | The pellet rocket effect in magnetic confinement fusion plasmas |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2412.15080 |