Upgrade of the Diagnostic Neutral Beam Injector for the RFX-mod2 experiment

IF 2 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Fusion Engineering and Design Pub Date : 2025-07-22 DOI:10.1016/j.fusengdes.2025.115320

Marco Barbisan , Marco Boldrin , Luca Cinnirella , Bruno Laterza , Alberto Maistrello , Lionello Marrelli , Federico Molon , Simone Peruzzo , Cesare Taliercio , Marco Valisa , Enrico Zampiva

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引用次数: 0

Abstract

Diagnostic Neutral Beam Injectors (DNBI), through the combined use of Charge Exchange Recombination Spectroscopy (CHERS) and Motional Stark effect diagnostics (MSE), are a well-known tool to access important information about magnetically confined plasmas, such as radial profiles of ion temperature, ion flow, impurity content and intensity and direction of the magnetic field. For this purpose, a DNBI was installed and operated in the RFX-mod experiment, which was designed to confine plasma mainly through the Reversed Field Pinch configuration. The DNBI, designed and built by the Budker Institute of Nuclear Physics (BINP), was based on a source of positive hydrogen ions, accelerated to 50 keV and for a maximum ion current of 5 A. The beam could be modulated and the maximum overall duration was 50 ms.

With the upgrade of RFX-mod to the present RFX-mod2 machine, the DNBI is being renovated to solve several power units faults and improve the overall reliability of the system. The 50 kV power supply is being improved, as well as the power supplies in the high voltage deck and its insulation transformer. Magnetic field survival tests were performed on the toroidal-core-based DC–DC converters that should power the electronic boards in a reliable way. The control system, originally based on CAMAC technology, was redesigned to be fully replaced. This contribution reviews the technical criticalities emerged in the DNBI check-up and the new solutions adopted to make the DNBI operative and more reliable.

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RFX-mod2实验诊断中性束注入器的改进

诊断中性束注入器（DNBI）通过结合使用电荷交换重组光谱（CHERS）和运动斯塔克效应诊断（MSE），是一种众所周知的获取磁约束等离子体重要信息的工具，如离子温度、离子流、杂质含量、磁场强度和方向的径向分布。为此，在RFX-mod实验中安装并操作了DNBI，该装置主要通过反向场夹紧配置来限制等离子体。由Budker核物理研究所（BINP）设计和建造的DNBI是基于一个正氢离子源，加速到50 keV，最大离子电流为5 a。随着RFX-mod升级到目前的RFX-mod2机器，DNBI正在进行改造，以解决几个动力单元的故障，提高系统的整体可靠性。50kv电源正在改进中，高压甲板内的电源及其绝缘变压器也在改进中。对基于环形磁芯的DC-DC转换器进行了磁场生存测试，该转换器应以可靠的方式为电路板供电。控制系统，最初基于CAMAC技术，被重新设计为完全替代。这篇文章回顾了DNBI检查中出现的技术关键问题，以及为使DNBI更有效和更可靠而采用的新解决方案。

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

Fusion Engineering and Design 工程技术-核科学技术

CiteScore

3.50

自引率

23.50%

发文量

275

审稿时长

3.8 months

期刊介绍： The journal accepts papers about experiments (both plasma and technology), theory, models, methods, and designs in areas relating to technology, engineering, and applied science aspects of magnetic and inertial fusion energy. Specific areas of interest include: MFE and IFE design studies for experiments and reactors; fusion nuclear technologies and materials, including blankets and shields; analysis of reactor plasmas; plasma heating, fuelling, and vacuum systems; drivers, targets, and special technologies for IFE, controls and diagnostics; fuel cycle analysis and tritium reprocessing and handling; operations and remote maintenance of reactors; safety, decommissioning, and waste management; economic and environmental analysis of components and systems.