Simulation and Overheating Alert Research for Beam Spot Temperatures on High-Field Side Protective Tiles in EAST-NBI

IF 1.9 4区 工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY
Chao Shi, Zhimin Liu, Yongjian Xu, Xingyuan Xu, Daoye Yang, Yuanlai Xie
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Abstract

Neutral Beam Injection (NBI), an auxiliary heating method in EAST, is evolving towards higher energy and longer pulses, leading to increased energy bombardment on the high-field side graphite protection tiles. This study explores the intricacies of theoretical injection energy and shine-through losses with respect to plasma density, NBI beam energy, and NBI pulse width. By evaluating the beam power distribution reaching the protective tiles, and subsequently assessing the temperature distribution on the tiles under varying pulse widths, a reliable comparison can be made between the simulated temperature results and experimental temperature data. To ensure the reliability of simulation results, the beam power distribution utilizes a two-dimensional Gaussian model and a particle model for contrast simulation. Similarly, the thermal deposition model employs a simplified uniform heating model, a analytic model and a finite element simulation model. As a reference, the experimentally measured data includes both infrared surface temperature measurements and buried thermocouple measurements. The objective of this study is to establish a correlation between key input variables and the protective tile temperature. By setting precise parameters, this research seeks to provide a predictive mechanism for thermal deposition, contributing to proactive overheating prevention and efficient adjustments to injection parameters and first-wall backend cooling metrics.

Abstract Image

东nbi高场侧防护瓦束斑温度模拟及过热预警研究
中性束注入(NBI)是EAST的一种辅助加热方法,正朝着更高能量和更长的脉冲发展,导致高场侧石墨保护瓦的能量轰击增加。本研究探讨了理论注入能量和穿透损耗与等离子体密度、NBI光束能量和NBI脉冲宽度的复杂性。通过计算到达防护瓦的光束功率分布,然后计算不同脉冲宽度下防护瓦上的温度分布,可以将模拟温度结果与实验温度数据进行可靠的比较。为了保证仿真结果的可靠性,光束功率分布采用二维高斯模型和粒子模型进行对比仿真。同样,热沉积模型采用简化的均匀加热模型、解析模型和有限元模拟模型。作为参考,实验测量数据包括红外表面温度测量和埋地热电偶测量。本研究的目的是建立关键输入变量与保护瓦温度之间的相关性。通过设置精确的参数,本研究旨在提供热沉积的预测机制,有助于主动过热预防和有效调整注射参数和第一壁后端冷却指标。
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来源期刊
Journal of Fusion Energy
Journal of Fusion Energy 工程技术-核科学技术
CiteScore
2.20
自引率
0.00%
发文量
24
审稿时长
2.3 months
期刊介绍: The Journal of Fusion Energy features original research contributions and review papers examining and the development and enhancing the knowledge base of thermonuclear fusion as a potential power source. It is designed to serve as a journal of record for the publication of original research results in fundamental and applied physics, applied science and technological development. The journal publishes qualified papers based on peer reviews. This journal also provides a forum for discussing broader policies and strategies that have played, and will continue to play, a crucial role in fusion programs. In keeping with this theme, readers will find articles covering an array of important matters concerning strategy and program direction.
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