Zobrazeno 1 - 10
of 314
pro vyhledávání: '"Lahsen Assoufid"'
Autor:
Peifan Liu, Paresh Pradhan, Xianbo Shi, Deming Shu, Keshab Kauchha, Zhi Qiao, Kenji Tamasaku, Taito Osaka, Diling Zhu, Takahiro Sato, James MacArthur, XianRong Huang, Lahsen Assoufid, Marion White, Kwang-Je Kim, Yuri Shvyd'ko
Publikováno v:
Journal of Synchrotron Radiation, Vol 31, Iss 4, Pp 751-762 (2024)
A cavity-based X-ray free-electron laser (CBXFEL) is a possible future direction in the development of fully coherent X-ray sources. CBXFELs consist of a low-emittance electron source, a magnet system with several undulators and chicanes, and an X-ra
Externí odkaz:
https://doaj.org/article/38284ee4932e49e2bb3d091e178d840d
Autor:
Albert Macrander, Xianbo Shi, Walan Grizzoli, Xianrong Huang, Nino Pereira, Michael Wojcik, Lahsen Assoufid
Publikováno v:
Journal of Synchrotron Radiation, Vol 31, Iss 3, Pp 508-516 (2024)
Coherent X-ray imaging is an active field at synchrotron sources. The images rely on the available coherent flux over a limited field of view. At many synchrotron beamlines a double-crystal monochromator (DCM) is employed in a standard nondispersive
Externí odkaz:
https://doaj.org/article/82c49faeb1da4f6686b11b9b5c65c389
Autor:
Xianbo Shi, Zhi Qiao, Paresh Pradhan, Peifan Liu, Lahsen Assoufid, Kwang-Je Kim, Yuri Shvyd'ko
Publikováno v:
Journal of Synchrotron Radiation, Vol 30, Iss 6, Pp 1100-1107 (2023)
The advent of next-generation synchrotron radiation sources and X-ray free-electron lasers calls for high-quality Bragg-diffraction crystal optics to preserve the X-ray beam coherence and wavefront. This requirement brings new challenges in character
Externí odkaz:
https://doaj.org/article/ac97e442163346e7a2504c4e6f3d4512
Autor:
Gautam Gunjala, Antoine Wojdyla, Kenneth A. Goldberg, Zhi Qiao, Xianbo Shi, Lahsen Assoufid, Laura Waller
Publikováno v:
Journal of Synchrotron Radiation, Vol 30, Iss 1, Pp 57-64 (2023)
Adaptive X-ray mirrors are being adopted on high-coherent-flux synchrotron and X-ray free-electron laser beamlines where dynamic phase control and aberration compensation are necessary to preserve wavefront quality from source to sample, yet challeng
Externí odkaz:
https://doaj.org/article/f462fc992f714735950c9536c0b5fc8a
Diffuse X-ray scattering from polished silicon: application of the distorted wave Born approximation
Publikováno v:
Journal of Synchrotron Radiation, Vol 29, Iss 2, Pp 447-455 (2022)
Measured diffuse X-ray scattering data for a `smooth' as well as for a `rough' silicon sample were fit to theoretical expressions within the distorted wave Born approximation (DWBA). Data for the power spectral density (PSD) for both samples were als
Externí odkaz:
https://doaj.org/article/b3f3cc6946cc437890195d4a7b04af83
Publikováno v:
Journal of Synchrotron Radiation, Vol 29, Iss 1, Pp 159-166 (2022)
Rigorous dynamical theory calculations show that four-beam diffraction (4BD) can be activated only by a unique photon energy and a unique incidence direction. Thus, 4BD may be used to precisely calibrate X-ray photon energies and beam positions. Base
Externí odkaz:
https://doaj.org/article/7a7bcc8678bd4d68b34e33a102074fbb
Publikováno v:
Journal of Imaging, Vol 7, Iss 12, p 249 (2021)
Near-field X-ray speckle tracking has been used in phase-contrast imaging and tomography as an emerging technique, providing higher contrast images than traditional absorption radiography. Most reported methods use sandpaper or membrane filters as sp
Externí odkaz:
https://doaj.org/article/f709734edd4d49138be9b0d8c604e0f8
Autor:
Lahsen Assoufid, Kenneth Goldberg, Antoine Wojdyla, Matthew Frith, Matthew Highland, Zhi Qiao, Xianbo Shi, Luca Rebuffi
Publikováno v:
Optics Express.
A neural-network machine learning model is developed to control a bimorph adaptive mirror to achieve and preserve aberration-free coherent X-ray wavefronts at synchrotron radiation and free electron laser beamlines. The controller is trained on a mir
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::66a029a688c2f20f551bde7446542358
https://doi.org/10.1364/oe.488189
https://doi.org/10.1364/oe.488189
Autor:
Hong Yu Peng, Ze Yu Chen, Ya Fei Liu, Qian Yu Cheng, Shan Shan Hu, Xian Rong Huang, Lahsen Assoufid, Balaji Raghothamachar, Michael Dudley
Publikováno v:
Materials Science Forum. 1062:356-360
Synchrotron monochromatic beam X-ray topography has been widely applied to characterize structural defects in SiC crystals. Using ray tracing simulations, the dislocation contrast in X-ray topography under strong diffraction conditions (diffraction t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e78ef0048bf4842bea5140a18dfc35b8
https://doi.org/10.4028/p-u7m9jr
https://doi.org/10.4028/p-u7m9jr
Autor:
Hongyu Peng, Zeyu Chen, Yafei Liu, Balaji Raghothamachar, Xianrong Huang, Lahsen Assoufid, Michael Dudley
Publikováno v:
Journal of Applied Crystallography. 55:544-550
Utilization of an Si(331) beam conditioner together with an Si(111) double-crystal monochromator (DCM) enables the angular resolution of synchrotron X-ray topography to be increased by an order of magnitude compared with grazing-incidence topography
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d0c755f9287c42ef4a1dcea2784ad8dc
https://doi.org/10.1107/s1600576722004046
https://doi.org/10.1107/s1600576722004046