Quantitative Measurement of Positive and Negative Ion Species Ejected from a Li–O–H Surface by Hydrogen and Noble Gas Ion Irradiation

IF 1.9 4区 工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY
S. Abe, E. T. Ostrowski, A. Maan, P. Krstic, R. Majeski, B. E. Koel
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引用次数: 1

Abstract

We report sputtering yields of Li+, H, O, and OHx ion species from an Li–O–H surface for H, D, He, Ne, and Ar ion irradiation at 45° incidence in the energy range of 30–2000 eV. A Li film was deposited on a stainless steel target using Li evaporators in the LTX-β vessel, using the LTX-β Sample Exposure Probe (SEP), which includes an ultrahigh vacuum suitcase for transferring targets without significant contamination from air exposure. The SEP was used to transfer the Li-coated target from LTX-β to a separate Sample Exposure Station (SES) to perform ion exposure measurements. The SEP was also used for characterization of the Li-coated target utilizing X-ray photoelectron spectroscopy in a different chamber, showing that the lithium film surface was oxidized. Ion exposures were performed using an electron cyclotron resonance plasma source in the SES. Sputtered/ejected species were sampled by a quadrupole mass spectrometer with capabilities for detecting positive and negative ions, and an energy filter for determining the mean kinetic energy of the ejected ion species. All ion irradiations caused Li+ ions to be ejected, while causing impurity ions such as H+, H, O and OH to be ejected. Measured ion energies of Li+ ions from a Li–O–H surface suggested that the typical sheath potential on the divertor surface can trap sputtered Li+ ions, which were previously reported as ~ 60% of total sputtered Li species from Li targets (Allain and Ruzic in Nucl Fusion 42:202, 2002). Hence, our results for the sputtering yields of ejected ion species and their associated ion energies from a Li–O–H surface indicates that lithium sputtering is suppressed and impurity removal is enhanced due to the sheath potential at the divertor surface for fusion reactor applications.

Abstract Image

氢和惰性气体离子辐照从锂氧氢表面喷射出正负离子的定量测定
我们报道了Li+, H−,O−和OHx−离子在30-2000 eV的45°入射辐射下从Li - O - H表面溅射的产额。在LTX-β容器中,使用Li蒸发器在不锈钢靶上沉积Li膜,使用LTX-β样品暴露探针(SEP),该探针包括一个超高真空手提箱,用于在没有明显空气污染的情况下转移靶。SEP用于将li包被的靶物从LTX-β转移到单独的样品暴露站(SES)进行离子暴露测量。SEP还在不同的腔室中利用x射线光电子能谱对锂涂层目标进行了表征,表明锂膜表面被氧化。离子暴露是在SES中使用电子回旋共振等离子体源进行的。溅射/喷射物质的取样采用具有检测正离子和负离子能力的四极杆质谱仪,以及用于确定喷射离子种类平均动能的能量过滤器。所有的离子辐照都引起Li+离子的喷射,同时引起H+、H−、O−和OH−等杂质离子的喷射。从Li - o - h表面测量的Li+离子的离子能量表明,分流器表面的典型鞘电位可以捕获溅射的Li+离子,以前报道过,从Li靶中溅射的Li离子约占总溅射Li离子的60% (Allain和Ruzic in nuclear Fusion 42:20 02, 2002)。因此,我们对Li-O-H表面溅射离子种类及其相关离子能量的研究结果表明,由于用于聚变反应堆的分流器表面的鞘层电位,锂溅射受到抑制,杂质去除得到加强。
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来源期刊
Journal of Fusion Energy
Journal of Fusion Energy 工程技术-核科学技术
CiteScore
2.20
自引率
0.00%
发文量
24
审稿时长
2.3 months
期刊介绍: The Journal of Fusion Energy features original research contributions and review papers examining and the development and enhancing the knowledge base of thermonuclear fusion as a potential power source. It is designed to serve as a journal of record for the publication of original research results in fundamental and applied physics, applied science and technological development. The journal publishes qualified papers based on peer reviews. This journal also provides a forum for discussing broader policies and strategies that have played, and will continue to play, a crucial role in fusion programs. In keeping with this theme, readers will find articles covering an array of important matters concerning strategy and program direction.
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