The effect of drive laser wavelength on the growth of ablative Rayleigh–Taylor instability(ARTI)in inertial confinemen fusion(ICF)is studied with two-dimensional numerical simulations.The results show that in the pla...The effect of drive laser wavelength on the growth of ablative Rayleigh–Taylor instability(ARTI)in inertial confinemen fusion(ICF)is studied with two-dimensional numerical simulations.The results show that in the plasma acceleration phase,shorter wavelengths lead to more efficien coupling between the laser and the kinetic energy of the implosion fluid Under the condition that the laser energy coupled to the implosion flui is constant,the ARTI growth rate decreases as the laser wavelength moves toward the extreme ultraviolet band,reaching its minimum value near λ=65 nm,and when the laser wavelength continuously moves toward the X-ray band,the ARTI growth rate increases rapidly.It is found that the results deviate from the theoretical ARTI growth rate.As the laser intensity benchmark increases,the position of the minimum ARTI growth rate shifts toward shorter wavelengths.As the initial sinusoidal perturbation wavenumber decreases,the position of the minimum ARTI growth rate shifts toward longer wavelengths.We believe that the conclusions drawn from the present simulations and analysis will help provide a better understanding of the ICF process and improve the theory of ARTI growth.展开更多
Objective and Impact Statement:A clinically viable technology for comprehensive esophagus surveillance and potential treatment is lacking.Here,we report a novel multifunctional ablative gastrointestinal imaging capsul...Objective and Impact Statement:A clinically viable technology for comprehensive esophagus surveillance and potential treatment is lacking.Here,we report a novel multifunctional ablative gastrointestinal imaging capsule(MAGIC)technology platform to address this clinical need.The MAGIC technology could also facilitate the clinical translation and adoption of the tethered capsule endomicroscopy(TCE)technology.Introduction:Recently developed optical coherence tomography(OCT)TCE technologies have shown a promising potential for surveillance of Barrett’s esophagus and esophageal cancer in awake patients without the need for sedation.However,it remains challenging with the current TCE technology for detecting early lesions and clinical adoption due to its suboptimal resolution,imaging contrast,and lack of visual guidance during imaging.Methods:Our technology reported here integrates dual-wavelength OCT imaging(operating at 800 and 1300 nm),an ultracompact endoscope camera,and an ablation laser,aiming to enable comprehensive surveillance,guidance,and potential ablative treatment of the esophagus.Results:The MAGIC has been successfully developed with its multimodality imaging and ablation capabilities demonstrated by imaging swine esophagus ex vivo and in vivo.The 800-nm OCT imaging offers exceptional resolution and contrast for the superficial layers,well suited for detecting subtle changes associated with early neoplasia.The 1300-nm OCT imaging provides deeper penetration,essential for assessing lesion invasion.The built-in miniature camera affords a conventional endoscopic view for assisting capsule deployment and laser ablation.Conclusion:By offering complementary and clinically viable functions in a single device,the reported technology represents an effective solution for endoscopic screening,diagnosis,and potential ablation treatment of the esophagus of a patient in an office setting.展开更多
High-resolution flow field data has important applications in meteorology,aerospace engineering,high-energy physics and other fields.Experiments and numerical simulations are two main ways to obtain high-resolution fl...High-resolution flow field data has important applications in meteorology,aerospace engineering,high-energy physics and other fields.Experiments and numerical simulations are two main ways to obtain high-resolution flow field data,while the high experiment cost and computing resources for simulation hinder the specificanalysis of flow field evolution.With the development of deep learning technology,convolutional neural networks areused to achieve high-resolution reconstruction of the flow field.In this paper,an ordinary convolutional neuralnetwork and a multi-time-path convolutional neural network are established for the ablative Rayleigh-Taylorinstability.These two methods can reconstruct the high-resolution flow field in just a few seconds,and further greatlyenrich the application of high-resolution reconstruction technology in fluid instability.Compared with the ordinaryconvolutional neural network,the multi-time-path convolutional neural network model has smaller error and canrestore more details of the flow field.The influence of low-resolution flow field data obtained by the two poolingmethods on the convolutional neural networks model is also discussed.展开更多
基金supported by the National Natural Science Foundation of China(NSFC)(Grant Nos.12074399,12204500,and 12004403)the Key Projects of the Intergovernmental International Scientifi and Technological Innovation Cooperation(Grant No.2021YFE0116700)+1 种基金the Shanghai Natural Science Foundation(Grant No.20ZR1464400)the Shanghai Sailing Program(Grant No.22YF1455300)。
文摘The effect of drive laser wavelength on the growth of ablative Rayleigh–Taylor instability(ARTI)in inertial confinemen fusion(ICF)is studied with two-dimensional numerical simulations.The results show that in the plasma acceleration phase,shorter wavelengths lead to more efficien coupling between the laser and the kinetic energy of the implosion fluid Under the condition that the laser energy coupled to the implosion flui is constant,the ARTI growth rate decreases as the laser wavelength moves toward the extreme ultraviolet band,reaching its minimum value near λ=65 nm,and when the laser wavelength continuously moves toward the X-ray band,the ARTI growth rate increases rapidly.It is found that the results deviate from the theoretical ARTI growth rate.As the laser intensity benchmark increases,the position of the minimum ARTI growth rate shifts toward shorter wavelengths.As the initial sinusoidal perturbation wavenumber decreases,the position of the minimum ARTI growth rate shifts toward longer wavelengths.We believe that the conclusions drawn from the present simulations and analysis will help provide a better understanding of the ICF process and improve the theory of ARTI growth.
基金supported in part by the National Institutes of Health under grants R01 CA153023 and P41 EB032840.
文摘Objective and Impact Statement:A clinically viable technology for comprehensive esophagus surveillance and potential treatment is lacking.Here,we report a novel multifunctional ablative gastrointestinal imaging capsule(MAGIC)technology platform to address this clinical need.The MAGIC technology could also facilitate the clinical translation and adoption of the tethered capsule endomicroscopy(TCE)technology.Introduction:Recently developed optical coherence tomography(OCT)TCE technologies have shown a promising potential for surveillance of Barrett’s esophagus and esophageal cancer in awake patients without the need for sedation.However,it remains challenging with the current TCE technology for detecting early lesions and clinical adoption due to its suboptimal resolution,imaging contrast,and lack of visual guidance during imaging.Methods:Our technology reported here integrates dual-wavelength OCT imaging(operating at 800 and 1300 nm),an ultracompact endoscope camera,and an ablation laser,aiming to enable comprehensive surveillance,guidance,and potential ablative treatment of the esophagus.Results:The MAGIC has been successfully developed with its multimodality imaging and ablation capabilities demonstrated by imaging swine esophagus ex vivo and in vivo.The 800-nm OCT imaging offers exceptional resolution and contrast for the superficial layers,well suited for detecting subtle changes associated with early neoplasia.The 1300-nm OCT imaging provides deeper penetration,essential for assessing lesion invasion.The built-in miniature camera affords a conventional endoscopic view for assisting capsule deployment and laser ablation.Conclusion:By offering complementary and clinically viable functions in a single device,the reported technology represents an effective solution for endoscopic screening,diagnosis,and potential ablation treatment of the esophagus of a patient in an office setting.
基金National Natural Science Foundation of China(1180500311947102+4 种基金12004005)Natural Science Foundation of Anhui Province(2008085MA162008085QA26)University Synergy Innovation Program of Anhui Province(GXXT-2022-039)State Key Laboratory of Advanced Electromagnetic Technology(Grant No.AET 2024KF006)。
文摘High-resolution flow field data has important applications in meteorology,aerospace engineering,high-energy physics and other fields.Experiments and numerical simulations are two main ways to obtain high-resolution flow field data,while the high experiment cost and computing resources for simulation hinder the specificanalysis of flow field evolution.With the development of deep learning technology,convolutional neural networks areused to achieve high-resolution reconstruction of the flow field.In this paper,an ordinary convolutional neuralnetwork and a multi-time-path convolutional neural network are established for the ablative Rayleigh-Taylorinstability.These two methods can reconstruct the high-resolution flow field in just a few seconds,and further greatlyenrich the application of high-resolution reconstruction technology in fluid instability.Compared with the ordinaryconvolutional neural network,the multi-time-path convolutional neural network model has smaller error and canrestore more details of the flow field.The influence of low-resolution flow field data obtained by the two poolingmethods on the convolutional neural networks model is also discussed.
