Radiation asymmetry in JET disruption mitigation experiments with shattered pellet injection

IF 2.1 2区物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS

Plasma Physics and Controlled Fusion Pub Date : 2024-06-26 DOI:10.1088/1361-6587/ad5933

L Piron, S Jachmich, L Baylor, M Baruzzo, M Lehnen, P Carvalho, M Kong, P Martin, T Lo Presti Piccolo, S Silburn, D Terranova, D Valcarcel, JET Contributors and Eurofusion Tokamak Exploitation Team

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Abstract

In ITER, to mitigate the deleterious effects of plasma disruptions, massive quantities of radiating impurities will be injected into the disrupting plasma by shattered pellet injectors (SPI) to pre-emptively radiate away the stored thermal and magnetic energy (Lehnen et al Proc. 27th IAEA Fusion Energy Conf. (FEC 2018) (Gandhinagar, India) EX/P7-12). However, asymmetries in the radiation pattern could result in intense photon flashes during the thermal quench that could locally damage or erode the stainless steel plasma-facing surface of the diagnostic port plugs (Pitts et al 2015 J. Nucl. Mater.463 748–75). Experiments have been undertaken at JET to assess the potential dependence of the radiated power asymmetry on plasma energy during SPI mitigated disruptions. Calculations of the toroidal asymmetry in the radiated power indicate that the toroidal peaking factor is largest near the SPI position and decreases with the plasma stored energy, which is a promising result in view of radiation heat loads during mitigated disruptions in ITER.

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用碎裂弹丸注入进行的 JET 干扰缓解实验中的辐射不对称问题

在热核实验堆中，为减轻等离子体破坏的有害影响，大量辐射杂质将通过碎裂颗粒注入器（SPI）注入破坏的等离子体中，以先发制人地辐射掉储存的热能和磁能（Lehnen 等人，第 27 届国际原子能机构聚变能会议（FEC 2018）（印度甘地纳加尔）EX/P7-12）。然而，辐射模式的不对称性可能会导致热淬火期间的强光子闪烁，从而局部损坏或侵蚀诊断端口插头面向等离子体的不锈钢表面（Pitts 等人，2015 年，J. Nucl. Mater.463 748-75）。已在 JET 进行了实验，以评估 SPI 缓解中断期间辐射功率不对称性对等离子体能量的潜在依赖性。对辐射功率环形不对称性的计算表明，环形峰值因子在 SPI 位置附近最大，并随等离子体存储能量的增加而减小。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plasma Physics and Controlled Fusion 物理-物理：核物理

CiteScore

4.50

自引率

13.60%

发文量

224

审稿时长

4.5 months

期刊介绍： Plasma Physics and Controlled Fusion covers all aspects of the physics of hot, highly ionised plasmas. This includes results of current experimental and theoretical research on all aspects of the physics of high-temperature plasmas and of controlled nuclear fusion, including the basic phenomena in highly-ionised gases in the laboratory, in the ionosphere and in space, in magnetic-confinement and inertial-confinement fusion as well as related diagnostic methods. Papers with a technological emphasis, for example in such topics as plasma control, fusion technology and diagnostics, are welcomed when the plasma physics is an integral part of the paper or when the technology is unique to plasma applications or new to the field of plasma physics. Papers on dusty plasma physics are welcome when there is a clear relevance to fusion.