磁约束聚变等离子体中的颗粒火箭效应

IF 9 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Physical review letters Pub Date : 2025-01-23 DOI:10.1103/physrevlett.134.035101

Nico J. Guth, Oskar Vallhagen, Per Helander, Istvan Pusztai, Sarah L. Newton, Tünde Fülöp

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引用次数: 0

摘要

冷冻物质的球团进入磁性受限的聚变等离子体，被所谓的球团火箭效应加速。不均匀的等离子体不对称地加热颗粒烧蚀云，产生压力驱动的、类似火箭的颗粒推进力。我们通过扰动球对称烧蚀模型，提出了这一过程的半解析模型。预测的粒子加速度与当前托卡马克的实验估计相符（~ 105m/s2）。对ITER高约束情景（~ 106 m/s2）的预测表明，在没有这种影响的情况下，颗粒穿透率明显低于预期，这可能会限制干扰缓解的有效性。2025年由美国物理学会出版

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Pellet Rocket Effect in Magnetic Confinement Fusion Plasmas

Pellets of frozen material traveling into a magnetically confined fusion plasma are accelerated by the so-called pellet rocket effect. The nonuniform plasma heats the pellet ablation cloud asymmetrically, producing pressure-driven, rocketlike propulsion of the pellet. We present a semianalytical model of this process by perturbing a spherically symmetric ablation model. Predicted pellet accelerations match experimental estimates in current tokamaks (∼105m/s2). Projections for ITER high-confinement scenarios (∼106 m/s2) indicate significantly shorter pellet penetration than expected without this effect, which could limit the effectiveness of disruption mitigation.

Published by the American Physical Society

2025

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来源期刊

Physical review letters 物理-物理：综合

CiteScore

16.50

自引率

7.00%

发文量

2673

审稿时长

2.2 months

期刊介绍： Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks