First ion temperature measurements in the MAST-U divertor via Retarding Field Energy Analyzer

IF 2.3 2区物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Materials and Energy Pub Date : 2025-03-10 DOI:10.1016/j.nme.2025.101912

Y. Damizia , S. Elmore , P. Ryan , S. Allan , F. Federici , N. Osborne , J.W. Bradley , MAST-U Team

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引用次数: 0

Abstract

This study presents the first ion temperature (

T_{i}

) measurements from the MAST-U divertor using a Retarding Field Energy Analyzer (RFEA). Embedded within the flat tile of the closed divertor chamber, the RFEA captures

T_{i}

profiles across various plasma scenarios, including transitions to the Super-X configuration. Measurements were conducted under steady-state and transient plasma conditions characterized by a plasma current (

I_{p}

) of 750 kA, electron density (

n_{e}

) between

2.2 \times 1 0^{19}

and

4.4 \times 1 0^{19} m^{- 3}

, and Neutral Beam Injection (NBI) power ranging from 3.0 MW to 3.2 MW. The ion temperatures, peaking at approximately 17 eV in steady state, were compared with electron temperatures (

T_{e}

) obtained from Langmuir probes (LP) at identical radial positions. Preliminary findings reveal a

T_{i} / T_{e}

ratio ranging from 1 to 2.2. Additionally, high temporal resolution measurements (

100 μ s

) captured the dynamics of Edge Localized Modes (ELMs), showing

T_{i}

peaks at 16 ±1.8 eV during ELM events, nearly three times higher than inter-ELM temperatures.

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通过减速场能量分析仪首次测量了MAST-U导流器中的离子温度

本研究首次使用缓速场能量分析仪（RFEA）测量了MAST-U导流器的离子温度（Ti）。RFEA嵌入在封闭导流器腔室的平面瓷砖中，可以捕获各种等离子体场景下的Ti剖面，包括过渡到Super-X配置。测量是在稳态和瞬态等离子体条件下进行的，其特征是等离子体电流（Ip）为750 kA，电子密度（ne）在2.2×1019和4.4×1019m−3之间，中性束注入（NBI）功率在3.0 MW到3.2 MW之间。离子温度在17 eV左右达到稳态峰值，并与Langmuir探针（LP）在相同径向位置获得的电子温度（Te）进行了比较。初步发现Ti/Te比值在1 ~ 2.2之间。此外，高时间分辨率测量（100μs）捕获了边缘局域模式（ELM）的动态，在ELM事件期间，Ti峰值为16±1.8 eV，比ELM间温度高出近3倍。

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

Nuclear Materials and Energy Materials Science-Materials Science (miscellaneous)

CiteScore

3.70

自引率

15.40%

发文量

175

审稿时长

20 weeks

期刊介绍： The open-access journal Nuclear Materials and Energy is devoted to the growing field of research for material application in the production of nuclear energy. Nuclear Materials and Energy publishes original research articles of up to 6 pages in length.