Design and development status of the ITER Radial Gamma Ray Spectrometer

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

Fusion Engineering and Design Pub Date : 2025-08-16 DOI:10.1016/j.fusengdes.2025.115376

Federico Scioscioli , Giulia Marcer , Alessandro Ciurlino , Stefano Colombi , Bruno Coriton , Andrea Dal Molin , Jan Dankowski , Giuseppe Gorini , Andrei Kovalev , Andrea Muraro , Massimo Nocente , Marica Rebai , Davide Rigamonti , Marco Tardocchi , Gabriele Croci

{"title":"Design and development status of the ITER Radial Gamma Ray Spectrometer","authors":"Federico Scioscioli , Giulia Marcer , Alessandro Ciurlino , Stefano Colombi , Bruno Coriton , Andrea Dal Molin , Jan Dankowski , Giuseppe Gorini , Andrei Kovalev , Andrea Muraro , Massimo Nocente , Marica Rebai , Davide Rigamonti , Marco Tardocchi , Gabriele Croci","doi":"10.1016/j.fusengdes.2025.115376","DOIUrl":null,"url":null,"abstract":"<div><div>The ITER Radial Gamma Ray Spectrometer (RGRS) is an ITER diagnostic located in the Equatorial Port 01 undergoing its Preliminary Design Review and foreseen for Phase DT1 (2041). RGRS is expected to measure the density profile and energy distribution of <span><math><mi>α</mi></math></span>-particles through reactions with <sup>10</sup>B, the current and maximum energy of runaway electrons through bremsstrahlung emissions, and fusion power via a radiative channel of the DT reaction. The diagnostic employs LaBr<sub>3</sub> scintillators coupled with PMTs along 4 radial lines of sight, with LiH attenuators to reduce the background due to direct neutrons and a heavily hydrogenated and borated concrete-like mixture for neutron shielding.</div><div>Performance assessments indicate RGRS can fulfil its functions regarding runaway electrons, while the feasibility of measuring <span><math><mi>α</mi></math></span>-particles is uncertain due to the intense gamma-ray background observed at JET. Further study is needed to confirm this measurement possibility. Additionally, while fusion power measurements appear possible, satisfying ITER requirements necessitates detailed knowledge of the gamma-ray-to-neutron branching-ratio of the DT reaction, which will be investigated through dedicated experiments, and possibly gamma-ray attenuators to reduce background.</div></div>","PeriodicalId":55133,"journal":{"name":"Fusion Engineering and Design","volume":"221 ","pages":"Article 115376"},"PeriodicalIF":2.0000,"publicationDate":"2025-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fusion Engineering and Design","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0920379625005721","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

The ITER Radial Gamma Ray Spectrometer (RGRS) is an ITER diagnostic located in the Equatorial Port 01 undergoing its Preliminary Design Review and foreseen for Phase DT1 (2041). RGRS is expected to measure the density profile and energy distribution of

α

-particles through reactions with ¹⁰B, the current and maximum energy of runaway electrons through bremsstrahlung emissions, and fusion power via a radiative channel of the DT reaction. The diagnostic employs LaBr₃ scintillators coupled with PMTs along 4 radial lines of sight, with LiH attenuators to reduce the background due to direct neutrons and a heavily hydrogenated and borated concrete-like mixture for neutron shielding.

Performance assessments indicate RGRS can fulfil its functions regarding runaway electrons, while the feasibility of measuring

α

-particles is uncertain due to the intense gamma-ray background observed at JET. Further study is needed to confirm this measurement possibility. Additionally, while fusion power measurements appear possible, satisfying ITER requirements necessitates detailed knowledge of the gamma-ray-to-neutron branching-ratio of the DT reaction, which will be investigated through dedicated experiments, and possibly gamma-ray attenuators to reduce background.

查看原文本刊更多论文

ITER射线伽马能谱仪的设计与研制现状

ITER径向伽马射线光谱仪（RGRS）是位于赤道01港的ITER诊断设备，正在进行初步设计审查，预计用于DT1（2041）阶段。RGRS有望通过与10B的反应测量α-粒子的密度分布和能量分布，通过轫致辐射测量逃逸电子的电流和最大能量，以及通过DT反应的辐射通道测量聚变功率。该诊断系统采用LaBr3闪烁体和沿4条视线径向线耦合的pmt，使用LiH衰减器来减少直接中子产生的背景，并使用重氢化和硼化混凝土状混合物来屏蔽中子。性能评价表明，RGRS可以完成对失控电子的测量功能，但由于JET观测到的强烈伽马射线背景，测量α-粒子的可行性尚不确定。需要进一步的研究来证实这种测量的可能性。此外，虽然聚变功率测量似乎是可能的，但满足ITER的要求需要详细了解DT反应的伽马射线与中子分支比，这将通过专门的实验进行研究，并可能使用伽马射线衰减器来降低背景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.