Journal of Synchrotron Radiation最新文献

Mitigation of DMM-induced stripe patterns in synchrotron X-ray radiography through dynamic tilting. 通过动态倾斜减轻同步辐射 X 射线摄影中 DMM 引起的条纹图案。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-11-01 Epub Date: 2024-10-25 DOI: 10.1107/S1600577524008646

Mustapha Eddah, Henning Markötter, Björn Mieller, Michael Sintschuk, Jörg Beckmann, Giovanni Bruno

{"title":"Mitigation of DMM-induced stripe patterns in synchrotron X-ray radiography through dynamic tilting.","authors":"Mustapha Eddah, Henning Markötter, Björn Mieller, Michael Sintschuk, Jörg Beckmann, Giovanni Bruno","doi":"10.1107/S1600577524008646","DOIUrl":"10.1107/S1600577524008646","url":null,"abstract":"In synchrotron X-ray radiography, achieving high image resolution and an optimal signal-to-noise ratio (SNR) is crucial for the subsequent accurate image analysis. Traditional methods often struggle to balance these two parameters, especially in situ applications where rapid data acquisition is essential to capture specific dynamic processes. For quantitative image data analysis, using monochromatic X-rays is essential. A double multilayer monochromator (DMM) is successfully used for this aim at the BAMline, BESSY II (Helmholtz Zentrum Berlin, Germany). However, such DMMs are prone to producing an unstable horizontal stripe pattern. Such an unstable pattern renders proper signal normalization difficult and thereby causes a reduction of the SNR. We introduce a novel approach to enhance SNR while preserving resolution: dynamic tilting of the DMM. By adjusting the orientation of the DMM during the acquisition of radiographic projections, we optimize the X-ray imaging quality, thereby enhancing the SNR. The corresponding shift of the projection during this movement is corrected in post-processing. The latter correction allows a good resolution to be preserved. This dynamic tilting technique enables the homogenization of the beam profile and thereby effectively reduces noise while maintaining high resolution. We demonstrate that data captured using this proposed technique can be seamlessly integrated into the existing radiographic data workflow, as it does not need hardware modifications to classical X-ray imaging beamline setups. This facilitates further image analysis and processing using established methods.","PeriodicalId":48729,"journal":{"name":"Journal of Synchrotron Radiation","volume":" ","pages":"1551-1560"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11542656/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142511020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correlative X-ray micro-nanotomography with scanning electron microscopy at the Advanced Light Source. 先进光源的 X 射线显微纳米层析技术与扫描电子显微镜的相关性。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-11-01 Epub Date: 2024-10-29 DOI: 10.1107/S1600577524009305

Arun J Bhattacharjee, Harrison P Lisabeth, Dilworth Parkinson, Alastair MacDowell

{"title":"Correlative X-ray micro-nanotomography with scanning electron microscopy at the Advanced Light Source.","authors":"Arun J Bhattacharjee, Harrison P Lisabeth, Dilworth Parkinson, Alastair MacDowell","doi":"10.1107/S1600577524009305","DOIUrl":"10.1107/S1600577524009305","url":null,"abstract":"Geological samples are inherently multi-scale. Understanding their bulk physical and chemical properties requires characterization down to the nano-scale. A powerful technique to study the three-dimensional microstructure is X-ray tomography, but it lacks information about the chemistry of samples. To develop a methodology for measuring the multi-scale 3D microstructure of geological samples, correlative X-ray micro- and nanotomography were performed on two rocks followed by scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS) analysis. The study was performed in five steps: (i) micro X-ray tomography was performed on rock sample cores, (ii) samples for nanotomography were prepared using laser milling, (iii) nanotomography was performed on the milled sub-samples, (iv) samples were mounted and polished for SEM analysis and (v) SEM imaging and compositional mapping was performed on micro and nanotomography samples for complimentary information. Correlative study performed on samples of serpentine and basalt revealed multiscale 3D structures involving both solid mineral phases and pore networks. Significant differences in the volume fraction of pores and mineral phases were also observed dependent on the imaging spatial resolution employed. This highlights the necessity for the application of such a multiscale approach for the characterization of complex aggregates such as rocks. Information acquired from the chemical mapping of different phases was also helpful in segmentation of phases that did not exhibit significant contrast in X-ray imaging. Adoption of the protocol used in this study can be broadly applied to 3D imaging studies being performed at the Advanced Light Source and other user facilities.","PeriodicalId":48729,"journal":{"name":"Journal of Synchrotron Radiation","volume":" ","pages":"1561-1570"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11542647/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142523429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Five-analyzer Johann spectrometer for hard X-ray photon-in/photon-out spectroscopy at the Inner Shell Spectroscopy beamline at NSLS-II: design, alignment and data acquisition. 用于 NSLS-II 内壳光谱光束线硬 X 射线光子进/光子出光谱分析的五分析器约翰光谱仪：设计、校准和数据采集。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-11-01 Epub Date: 2024-10-30 DOI: 10.1107/S1600577524009342

Akhil Tayal, David Scott Coburn, Donald Abel, Max Rakitin, Oksana Ivashkevych, Jakub Wlodek, Dominik Wierzbicki, Weihe Xu, Evgeny Nazaretski, Eli Stavitski, Denis Leshchev

引用次数: 0

X-ray ghost imaging with a specially developed beam splitter. 利用专门开发的分束器进行 X 射线鬼影成像。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-11-01 Epub Date: 2024-09-30 DOI: 10.1107/S1600577524008038

Chang Zhe Zhao, Hai Peng Zhang, Jie Tang, Ni Xi Zhao, Zhong Liang Li, Ti Qiao Xiao

{"title":"X-ray ghost imaging with a specially developed beam splitter.","authors":"Chang Zhe Zhao, Hai Peng Zhang, Jie Tang, Ni Xi Zhao, Zhong Liang Li, Ti Qiao Xiao","doi":"10.1107/S1600577524008038","DOIUrl":"10.1107/S1600577524008038","url":null,"abstract":"X-ray ghost imaging with a crystal beam splitter has advantages in highly efficient imaging due to the simultaneous acquisition of signals from both the object beam and reference beam. However, beam splitting with a large field of view, uniform distribution and high correlation has been a great challenge up to now. Therefore, a dedicated beam splitter has been developed by optimizing the optical layout of a synchrotron radiation beamline and the fabrication process of a Laue crystal. A large field of view, consistent size, uniform intensity distribution and high correlation were obtained simultaneously for the two split beams. Modulated by a piece of copper foam upstream of the splitter, a correlation of 92% between the speckle fields of the object and reference beam and a Glauber function of 1.25 were achieved. Taking advantage of synthetic aperture X-ray ghost imaging (SAXGI), a circuit board of size 880 × 330 pixels was successfully imaged with high fidelity. In addition, even though 16 measurements corresponding to a sampling rate of 1% in SAXGI were used for image reconstruction, the skeleton structure of the circuit board can still be determined. In conclusion, the specially developed beam splitter is applicable for the efficient implementation of X-ray ghost imaging.","PeriodicalId":48729,"journal":{"name":"Journal of Synchrotron Radiation","volume":" ","pages":"1525-1533"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11542653/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142356518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A general Bayesian algorithm for the autonomous alignment of beamlines. 用于光束线自主校准的通用贝叶斯算法。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-11-01 Epub Date: 2024-10-28 DOI: 10.1107/S1600577524008993

Thomas W Morris, Max Rakitin, Yonghua Du, Mikhail Fedurin, Abigail C Giles, Denis Leshchev, William H Li, Brianna Romasky, Eli Stavitski, Andrew L Walter, Paul Moeller, Boaz Nash, Antoine Islegen-Wojdyla

{"title":"A general Bayesian algorithm for the autonomous alignment of beamlines.","authors":"Thomas W Morris, Max Rakitin, Yonghua Du, Mikhail Fedurin, Abigail C Giles, Denis Leshchev, William H Li, Brianna Romasky, Eli Stavitski, Andrew L Walter, Paul Moeller, Boaz Nash, Antoine Islegen-Wojdyla","doi":"10.1107/S1600577524008993","DOIUrl":"10.1107/S1600577524008993","url":null,"abstract":"Autonomous methods to align beamlines can decrease the amount of time spent on diagnostics, and also uncover better global optima leading to better beam quality. The alignment of these beamlines is a high-dimensional expensive-to-sample optimization problem involving the simultaneous treatment of many optical elements with correlated and nonlinear dynamics. Bayesian optimization is a strategy of efficient global optimization that has proved successful in similar regimes in a wide variety of beamline alignment applications, though it has typically been implemented for particular beamlines and optimization tasks. In this paper, we present a basic formulation of Bayesian inference and Gaussian process models as they relate to multi-objective Bayesian optimization, as well as the practical challenges presented by beamline alignment. We show that the same general implementation of Bayesian optimization with special consideration for beamline alignment can quickly learn the dynamics of particular beamlines in an online fashion through hyperparameter fitting with no prior information. We present the implementation of a concise software framework for beamline alignment and test it on four different optimization problems for experiments on X-ray beamlines at the National Synchrotron Light Source II and the Advanced Light Source, and an electron beam at the Accelerator Test Facility, along with benchmarking on a simulated digital twin. We discuss new applications of the framework, and the potential for a unified approach to beamline alignment at synchrotron facilities.","PeriodicalId":48729,"journal":{"name":"Journal of Synchrotron Radiation","volume":" ","pages":"1446-1456"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11542659/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142523427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

distect: automatic sample-position tracking for X-ray experiments using computer vision algorithms. distect：利用计算机视觉算法自动跟踪 X 射线实验的样本位置。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-11-01 Epub Date: 2024-10-30 DOI: 10.1107/S1600577524009536

Michael Berg, Dirk Furrer, Vincent Thominet, Xiaoqiang Wang, Stefan Zeugin, Helmut Grabner, Kurt Stockinger, Cinthia Piamonteze

{"title":"distect: automatic sample-position tracking for X-ray experiments using computer vision algorithms.","authors":"Michael Berg, Dirk Furrer, Vincent Thominet, Xiaoqiang Wang, Stefan Zeugin, Helmut Grabner, Kurt Stockinger, Cinthia Piamonteze","doi":"10.1107/S1600577524009536","DOIUrl":"10.1107/S1600577524009536","url":null,"abstract":"Soft X-ray spectroscopy is an important technique for measuring the fundamental properties of materials. However, for measurements of samples in the sub-millimetre range, many experimental setups show limitations. Position drifts on the order of hundreds of micrometres during thermal stabilization of the system can last for hours of expensive beam time. To compensate for drifts, sample tracking and feedback systems must be used. However, in complex sample environments where sample access is very limited, many existing solutions cannot be applied. In this work, we apply a robust computer vision algorithm to automatically track and readjust the sample position in the dozens of micrometres range. Our approach is applied in a complex sample environment, where the sample is in an ultra-high vacuum chamber, surrounded by cooled thermal shields to reach sample temperatures down to 2.5 K and in the center of a superconducting split coil. Our implementation allows sample-position tracking and adjustment in the vertical direction since this is the dimension where drifts occur during sample temperature change in our setup. The approach can be easily extended to 2D. The algorithm enables a factor of ten improvement in the overlap of a series of X-ray absorption spectra in a sample with a vertical size down to 70 µm. This solution can be used in a variety of experimental stations, where optical access is available and sample access by other means is reduced.","PeriodicalId":48729,"journal":{"name":"Journal of Synchrotron Radiation","volume":" ","pages":"1514-1524"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11542654/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142548455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In situ/operando method for energy stability measurement of synchrotron radiation. 同步辐射能量稳定性测量的原位/操作法。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-11-01 Epub Date: 2024-10-15 DOI: 10.1107/S160057752400852X

Shangyu Si, Zhongliang Li, Lian Xue, Ke Li

引用次数: 0

Thermal analysis of a reflection mirror by fluid and solid heat transfer method. 用流体和固体传热法对反射镜进行热分析。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-11-01 Epub Date: 2024-10-15 DOI: 10.1107/S1600577524008749

Zhen Wang, Fang Liu, Chaofan Xue

引用次数: 0

Celebrating JSR's 30th anniversary: reminiscences of a Main Editor. 庆祝 JSR 30 周年：主要编辑的回忆。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-11-01 Epub Date: 2024-10-01 DOI: 10.1107/S1600577524009482

John R Helliwell

引用次数: 0

Synchrotron CT dosimetry for wiggler operation at reduced magnetic field and spatial modulation with bow tie filters. 利用弓形领带滤波器和空间调制进行同步加速器 CT 剂量测定。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-11-01 Epub Date: 2024-10-22 DOI: 10.1107/S1600577524008531

Stewart Midgley, Nanette Schleich, Andrew Stevenson, Alex Merchant

{"title":"Synchrotron CT dosimetry for wiggler operation at reduced magnetic field and spatial modulation with bow tie filters.","authors":"Stewart Midgley, Nanette Schleich, Andrew Stevenson, Alex Merchant","doi":"10.1107/S1600577524008531","DOIUrl":"10.1107/S1600577524008531","url":null,"abstract":"The Australian Synchrotron Imaging and Medical Beamline (IMBL) uses a superconducting multipole wiggler (SCMPW) source, dual crystal Laue monochromator and 135 m propagation distance to enable imaging and computed tomography (CT) studies of large samples with mono-energetic radiation. This study aimed to quantify two methods for CT dose reduction: wiggler source operation at reduced magnetic field strength, and beam modulation with spatial filters placed upstream from the sample. Transmission measurements with copper were used to indirectly quantify the influence of third harmonic radiation. Operation at lower wiggler magnetic field strength reduces dose rates by an order of magnitude, and suppresses the influence of harmonic radiation, which is of significance near 30 keV. Beam shaping filters modulate the incident beam profile for near constant transmitted signal, and offer protection to radio-sensitive surface organs: the eye lens, thyroid and female breast. Their effect is to reduce the peripheral dose and the dose to the scanned volume by about 10% for biological samples of 35-50 mm diameter and by 20-30% for samples of up to 160 mm diameter. CT dosimetry results are presented as in-air measurements that are specific to the IMBL, and as ratios to in-air measurements that may be applied to other beamlines. As CT dose calculators for small animals are yet to be developed, results presented here and in a previous study may be used to estimate absorbed dose to organs near the surface and the isocentre.","PeriodicalId":48729,"journal":{"name":"Journal of Synchrotron Radiation","volume":" ","pages":"1438-1445"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11542655/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142478291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0