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. 2019 Feb 19;9:2277. doi: 10.1038/s41598-019-39053-0

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Effect of helium implantation parameters on the SAXS signal from bubbles and gas bubble superlattices in tungsten with sample ID in parentheses: (a) Temperature (to a fluence of 1 × 10¹⁷ ions/cm² with a flux of 6.2 × 10¹² ions/cm²/s), (b) Fluence (at 500 °C with a flux of 2.7 × 10¹² ions/cm²/s); (c) Flux (at 500 °C to a fluence of 1 × 10¹⁷ ions/cm²). All samples have helium bubbles and the symbol ^*indicates samples that have gas bubble superlattices. Samples are offset in the vertical direction for clarity. The scattering vector Q is related to characteristic length D by: Q = 2π/D.