Thermal helium beam diagnostic for 2D profile measurements in the divertor of ASDEX Upgrade.

IF 1.3 4区工程技术 Q3 INSTRUMENTS & INSTRUMENTATION

Review of Scientific Instruments Pub Date : 2024-11-01 DOI:10.1063/5.0237317

S Hörmann, M Cavedon, M Griener, D Wendler, R Dux, K Schmid, A Kappatou, M Wischmeier, D J Cruz-Zabala, E Viezzer, U Stroth

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引用次数: 0

Abstract

A new thermal helium beam diagnostic has been implemented in the outer lower divertor of the ASDEX Upgrade tokamak. The purpose of this diagnostic is to measure two-dimensional profiles of electron density (ne) and temperature (Te) with high temporal and spatial resolution. The geometry of the lines of sight is chosen to avoid the influence of prompt recycling and to optimize the resolution without significantly impacting the divertor structure. Moreover, the effect of long-term helium recycling has been analyzed, and its amplitude compared to the active signal is negligible. Finally, the reconstruction of ne and Te is done via a collisional radiative model, while a static and a dynamic model were implemented and compared with SOLPS simulations as well as divertor Thomson scattering data. Furthermore, a new 2D parameterization of the outer divertor volume, which is required for the dynamic model, was developed. Due to its fast and local ne and Te profile measurements, the diagnostic is suitable for investigating fast processes such as divertor transitions and filaments.

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用于 ASDEX 升级版分流器二维剖面测量的热氦束诊断。

在 ASDEX 升级型托卡马克的外侧下分流器中实施了一项新的热氦束诊断。该诊断的目的是以较高的时间和空间分辨率测量电子密度（ne）和温度（Te）的二维剖面。选择视线的几何形状是为了避免瞬时再循环的影响，并在不对转发器结构产生重大影响的情况下优化分辨率。此外，还分析了长期氦循环的影响，其幅度与活动信号相比可以忽略不计。最后，氖和碲的重建是通过碰撞辐射模型完成的，同时实施了静态和动态模型，并与 SOLPS 模拟和分流器汤姆逊散射数据进行了比较。此外，还开发了动态模型所需的外部憩室体积的新二维参数化。由于其快速和局部的氖和碲剖面测量，该诊断仪适用于研究快速过程，如憩息器转换和丝状。

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

Review of Scientific Instruments 工程技术-物理：应用

CiteScore

3.00

自引率

12.50%

发文量

758

审稿时长

2.6 months

期刊介绍： Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.