Nanoscale lithium evaporation and behavior in a superconducting linear accelerator of a future fusion neutron source A-FNS

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-09-04 DOI:10.1016/j.nima.2025.170989

Takashi Ebisawa , Satoshi Sato , Makoto Oyaizu , Hiroshi Sakai , Eiji Kako

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引用次数: 0

Abstract

The fusion neutron source (A-FNS) project is underway at the Rokkasho Institute for Fusion Energy, QST, in Japan. The A-FNS will conduct fusion neutron irradiation tests of fusion reactor materials. A high-intensity deuteron (D) beam accelerator with a Li target has been designed to produce large amounts of neutrons by the D-Li reaction.

The A-FNS linac comprises a superconducting linac and a free-surface liquid Li target. Because the degradation of superconducting radio-frequency (SRF) cavities by Li contamination is of concern, a dedicated beam line design for reducing Li back streaming and a study of the Li behavior in ultra-high vacuum (UHV) are necessary. However, the relationship between the SRF performance and Li contamination remains unclear. To clarify this, we designed a nanoscale Li evaporation system to inject Li vapor into SRF cavities and investigated the behavior of the Li vapor.

This paper reports the development and operational results of the nanoscale Li evaporation apparatus.

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未来聚变中子源a - fns超导直线加速器中纳米级锂的蒸发和行为

聚变中子源（A-FNS）项目正在日本六所聚变能源研究所（QST）进行。A-FNS将对聚变反应堆材料进行聚变中子辐照试验。设计了一种具有Li靶的高强度氘核(D)束流加速器，通过D-Li反应产生大量中子。a - fns直线加速器包括一个超导直线加速器和一个自由表面液态锂靶。由于锂污染对超导射频（SRF）空腔的影响是一个值得关注的问题，因此有必要设计专门的束流线来减少锂的回流，并研究锂在超高真空（UHV）中的行为。然而，SRF性能与锂污染之间的关系尚不清楚。为了澄清这一点，我们设计了一个纳米级的Li蒸发系统，将Li蒸气注入SRF腔中，并研究了Li蒸气的行为。本文报道了纳米级锂蒸发装置的研制和运行结果。

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 Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.