Journal of Synchrotron Radiation最新文献_第5页

MLgrating: a program for simulating multilayer gratings for tender X-ray applications. MLgrating：用于模拟嫩X射线应用的多层光栅的程序。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-09-01 Epub Date: 2024-08-01 DOI: 10.1107/S1600577524006271

Andrew Walters, Shengyou Wen, Qiushi Huang, Zhanshan Wang, Hongchang Wang, Kawal Sawhney

引用次数: 0

Correcting angular distortions in Bragg coherent X-ray diffraction imaging. 校正布拉格相干 X 射线衍射成像中的角度畸变。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-09-01 Epub Date: 2024-08-08 DOI: 10.1107/S1600577524006507

Huaiyu Chen, Dmitry Dzhigaev, Alexander Björling, Fabian Westermeier, Mikhail Lyubomirskiy, Michael Stuckelberger, Jesper Wallentin

引用次数: 0

Investigating the missing-wedge problem in small-angle X-ray scattering tensor tomography across real and reciprocal space. 研究小角 X 射线散射张量断层扫描中跨越实空间和倒易空间的缺边问题。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-09-01 Epub Date: 2024-08-28 DOI: 10.1107/S1600577524006702

Leonard C Nielsen, Torne Tänzer, Irene Rodriguez-Fernandez, Paul Erhart, Marianne Liebi

{"title":"Investigating the missing-wedge problem in small-angle X-ray scattering tensor tomography across real and reciprocal space.","authors":"Leonard C Nielsen, Torne Tänzer, Irene Rodriguez-Fernandez, Paul Erhart, Marianne Liebi","doi":"10.1107/S1600577524006702","DOIUrl":"10.1107/S1600577524006702","url":null,"abstract":"Small-angle-scattering tensor tomography is a technique for studying anisotropic nanostructures of millimetre-sized samples in a volume-resolved manner. It requires the acquisition of data through repeated tomographic rotations about an axis which is subjected to a series of tilts. The tilt that can be achieved with a typical setup is geometrically constrained, which leads to limits in the set of directions from which the different parts of the reciprocal space map can be probed. Here, we characterize the impact of this limitation on reconstructions in terms of the missing wedge problem of tomography, by treating the problem of tensor tomography as the reconstruction of a three-dimensional field of functions on the unit sphere, represented by a grid of Gaussian radial basis functions. We then devise an acquisition scheme to obtain complete data by remounting the sample, which we apply to a sample of human trabecular bone. Performing tensor tomographic reconstructions of limited data sets as well as the complete data set, we further investigate and validate the missing wedge problem by investigating reconstruction errors due to data incompleteness across both real and reciprocal space. Finally, we carry out an analysis of orientations and derived scalar quantities, to quantify the impact of this missing wedge problem on a typical tensor tomographic analysis. We conclude that the effects of data incompleteness are consistent with the predicted impact of the missing wedge problem, and that the impact on tensor tomographic analysis is appreciable but limited, especially if precautions are taken. In particular, there is only limited impact on the means and relative anisotropies of the reconstructed reciprocal space maps.","PeriodicalId":48729,"journal":{"name":"Journal of Synchrotron Radiation","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11371061/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142086367","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

The soft X-ray spectromicroscopy beamline BL08U1A upgrade at SSRF. 软 X 射线光谱光束线 BL08U1A 在 SSRF 升级。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-09-01 Epub Date: 2024-08-22 DOI: 10.1107/S1600577524006684

Xiangjun Zhen, Zhi Guo, Zengyan Zhang, Yong Wang, Renzhong Tai

{"title":"The soft X-ray spectromicroscopy beamline BL08U1A upgrade at SSRF.","authors":"Xiangjun Zhen, Zhi Guo, Zengyan Zhang, Yong Wang, Renzhong Tai","doi":"10.1107/S1600577524006684","DOIUrl":"10.1107/S1600577524006684","url":null,"abstract":"Beamline BL08U1A is a soft X-ray spectromicroscopy beamline at Shanghai Synchrotron Radiation Facility (SSRF) that exhibits the capabilities of high spatial resolution (30 nm) and high energy resolving power (over 104). As a first-generation beamline of SSRF, owing to its continuous operation over the last ten years, an urgent upgrade of the equipment including the monochromator was deemed necessary. The upgrade work included the overall construction of the monochromator and replacement of the mirrors upstream and downstream of the monochromator. Based on its original skeleton, two elliptically cylinder mirrors were designed to focus the beam horizontally, which can increase the flux density by about three times on the exit slits. Meanwhile, the application of variable-line-space gratings in the monochromator demonstrates the dual functions of dispersing and focusing on the exit slits which can decrease abberations dramatically. After the upgrade of the main components of the beamline, the energy range is 180-2000 eV, the energy resolving power reaches 16333 @ 244 eV and 12730 @ 401 eV, and the photon flux measured in the experimental station is over 2.45 × 109 photons s-1 (E/ΔE = 6440 @ 244 eV).","PeriodicalId":48729,"journal":{"name":"Journal of Synchrotron Radiation","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11371065/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142019260","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

Characterizing electron-collecting CdTe for use in a 77 ns burst-rate imager. 鉴定用于 77 毫微秒猝发率成像仪的电子收集碲化镉。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-09-01 Epub Date: 2024-08-07 DOI: 10.1107/S160057752400643X

Lena A Franklin, Nicholas J Brown, Sol M Gruner, Elida Met-Hoxha, Mark W Tate, Julia Thom-Levy

{"title":"Characterizing electron-collecting CdTe for use in a 77 ns burst-rate imager.","authors":"Lena A Franklin, Nicholas J Brown, Sol M Gruner, Elida Met-Hoxha, Mark W Tate, Julia Thom-Levy","doi":"10.1107/S160057752400643X","DOIUrl":"10.1107/S160057752400643X","url":null,"abstract":"The Keck-PAD (pixel array detector) was developed at Cornell as a burst-rate imager capable of recording images from successive electron bunches (153 ns period) from the Advanced Photon Source (APS). Both Si and hole-collecting Schottky CdTe have been successfully bonded to this ASIC (application-specific integrated circuit) and used with this frame rate. The facility upgrades at the APS will lower the bunch period to 77 ns, which will require modifications to the Keck-PAD electronics to image properly at this reduced period. In addition, operation at high X-ray energies will require a different sensor material having a shorter charge collection time. For the target energy of 40 keV for this project, simulations have shown that electron-collecting CdTe should allow >90% charge collection within 35 ns. This collection time will be sufficient to sample the signal from one frame and prepare for the next. 750 µm-thick electron-collecting Schottky CdTe has been obtained from Acrorad and bonded to two different charge-integrating ASICs developed at Cornell, the Keck-PAD and the CU-APS-PAD. Carrier mobility has been investigated using the detector response to single X-ray bunches at the Cornell High Energy Synchrotron Source and to a pulsed optical laser. The tests indicate that the collection time will meet the requirements for 77 ns imaging.","PeriodicalId":48729,"journal":{"name":"Journal of Synchrotron Radiation","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11371066/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141903286","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

Area normalization of HERFD-XANES spectra. HERFD-XANES 光谱的面积归一化。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-09-01 Epub Date: 2024-08-06 DOI: 10.1107/S1600577524005307

Luca Bugarin, Hugo Alexander Suarez Orduz, Pieter Glatzel

引用次数: 0

Hard X-ray operation of X-ray gas monitors at the European XFEL. 欧洲 XFEL X 射线气体监测器的硬 X 射线操作。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-07-01 Epub Date: 2024-06-05 DOI: 10.1107/S160057752400331X

Theophilos Maltezopoulos, Frank Brinker, Florian Dietrich, Wolfgang Freund, Jan Grünert, Ulf Fini Jastrow, Naresh Kujala, Joakim Laksman, Jia Liu, Kai Tiedtke, Thomas Tschentscher

{"title":"Hard X-ray operation of X-ray gas monitors at the European XFEL.","authors":"Theophilos Maltezopoulos, Frank Brinker, Florian Dietrich, Wolfgang Freund, Jan Grünert, Ulf Fini Jastrow, Naresh Kujala, Joakim Laksman, Jia Liu, Kai Tiedtke, Thomas Tschentscher","doi":"10.1107/S160057752400331X","DOIUrl":"10.1107/S160057752400331X","url":null,"abstract":"X-ray gas monitors (XGMs) are operated at the European XFEL for non-invasive single-shot pulse energy measurements and average beam-position monitoring. The underlying measurement principle is the photo-ionization of rare gas atoms at low gas pressures and the detection of the photo-ions and photo-electrons created. These are essential for tuning and sustaining self-amplified spontaneous emission (SASE) operation, machine radiation safety, and sorting single-shot experimental data according to pulse energy. In this paper, the first results from XGM operation at photon energies up to 30 keV are presented, which are far beyond the original specification of this device. Here, the Huge Aperture MultiPlier (HAMP) is used for single-shot pulse energy measurements since the standard X-ray gas monitor detectors (XGMDs) do not provide a sufficient signal-to-noise ratio, even at the highest operating gas pressures. A single-shot correlation coefficient of 0.98 is measured between consecutive XGMs operated with HAMP, which is as good as measuring with the standard XGMD detectors. An intra-train non-linearity of the HAMP signal is discovered, and operation parameters to mitigate this effect are studied. The upper repetition rate limit of HAMP operation at 2.25 MHz is also determined. Finally, the possibilities and limits for future XGM operation at photon energies up to 50 keV are discussed.","PeriodicalId":48729,"journal":{"name":"Journal of Synchrotron Radiation","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11226157/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141262084","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

Teaching about the birth of synchrotron light: the role of Frascati and a missed opportunity. 关于同步辐射诞生的教学：弗拉斯卡蒂的作用和错失的机会。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-07-01 Epub Date: 2024-05-21 DOI: 10.1107/S160057752400300X

G Margaritondo

引用次数: 0

Ion beam figuring for X-ray mirrors: history, state-of-the-art and future prospects. 用于 X 射线反射镜的离子束图解：历史、最新技术和未来前景。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-07-01 Epub Date: 2024-05-21 DOI: 10.1107/S1600577524002935

Riley Shurvinton, Hongchang Wang, Paresh Pradhan, Ioana Theodora Nistea, Simon Alcock, Murilo Bazan Da Silva, Arindam Majhi, Kawal Sawhney

引用次数: 0

X-ray scattering based scanning tomography for imaging and structural characterization of cellulose in plants. 基于 X 射线散射的扫描断层成像技术，用于植物纤维素的成像和结构表征。

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2024-07-01 Epub Date: 2024-06-25 DOI: 10.1107/S1600577524004387

Lin Yang

{"title":"X-ray scattering based scanning tomography for imaging and structural characterization of cellulose in plants.","authors":"Lin Yang","doi":"10.1107/S1600577524004387","DOIUrl":"10.1107/S1600577524004387","url":null,"abstract":"X-ray and neutron scattering have long been used for structural characterization of cellulose in plants. Due to averaging over the illuminated sample volume, these measurements traditionally overlooked the compositional and morphological heterogeneity within the sample. Here, a scanning tomographic imaging method is described, using contrast derived from the X-ray scattering intensity, for virtually sectioning the sample to reveal its internal structure at a resolution of a few micrometres. This method provides a means for retrieving the local scattering signal that corresponds to any voxel within the virtual section, enabling characterization of the local structure using traditional data-analysis methods. This is accomplished through tomographic reconstruction of the spatial distribution of a handful of mathematical components identified by non-negative matrix factorization from the large dataset of X-ray scattering intensity. Joint analysis of multiple datasets, to find similarity between voxels by clustering of the decomposed data, could help elucidate systematic differences between samples, such as those expected from genetic modifications, chemical treatments or fungal decay. The spatial distribution of the microfibril angle can also be analyzed, based on the tomographically reconstructed scattering intensity as a function of the azimuthal angle.","PeriodicalId":48729,"journal":{"name":"Journal of Synchrotron Radiation","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11226170/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141451996","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