Magnetic reconnection of the self-generated magnetic fields in laser-plasma interaction is an important laboratory method for modeling high-energy density astronomical and astrophysical phenomena.We use the Martin-Pup...Magnetic reconnection of the self-generated magnetic fields in laser-plasma interaction is an important laboratory method for modeling high-energy density astronomical and astrophysical phenomena.We use the Martin-Puplett interferometer(MPI)polarimeter to probe the peripheral magnetic fields generated in the common magnetic reconnection configuration,two separated coplanar plane targets,in laser-target interaction.We introduce a new method that can obtain polarization information from the interference pattern instead of the sinusoidal function fitting of the intensity.A bidirectional magnetic field is observed from the side view,which is consistent with the magneto-hydro-dynamical(MHD)simulation results of self-generated magnetic field reconnection.We find that the cancellation of reverse magnetic fields after averaging and integration along the observing direction could reduce the magnetic field strength by one to two orders of magnitude.It indicates that imaging resolution can significantly affect the accuracy of measured magnetic field strength.展开更多
It is challenging to make an ultrafast diagnosis of the temporal evolution of small and short-lived plasma in two dimensions. To overcome this difficulty, we have developed a well-timed diagnostic utilizing an x-ray s...It is challenging to make an ultrafast diagnosis of the temporal evolution of small and short-lived plasma in two dimensions. To overcome this difficulty, we have developed a well-timed diagnostic utilizing an x-ray streak camera equipped with a row of multi-pinhole arrays. By processing multiple sets of one-dimensional streaked image data acquired from various pinholes, we are capable of reconstructing high-resolution two-dimensional images with a temporal resolution of 38 ps and a spatial resolution of 18 μm. The temporal fiducial pulses accessed from external sources can advance the precise timing and accurately determine the arrival time of the laser. Moreover, it can correct the nonlinear sweeping speed of the streak camera. The effectiveness of this diagnostic has been successfully verified at the Shenguang-II laser facility,providing an indispensable tool for observing complex physical phenomena, such as the implosion process of laser-fusion experiments.展开更多
目的评价我国血吸虫病防治研究机构的学术影响力。方法以Web of Science(WOS)数据平台的科学引文索引扩展版数据库(Science Citation Index Expanded,SCIE)为数据源,检索2002-2012年血吸虫病研究领域的学术论文(论著或综述),采用文献计...目的评价我国血吸虫病防治研究机构的学术影响力。方法以Web of Science(WOS)数据平台的科学引文索引扩展版数据库(Science Citation Index Expanded,SCIE)为数据源,检索2002-2012年血吸虫病研究领域的学术论文(论著或综述),采用文献计量法统计中国机构及作者在SCIE数据库中的发文量、h指数、被引频次等指标,并根据发文量和h指数对机构和作者的学术影响力进行评价。采用CiteSpace II软件绘制科学知识网络图谱,分析机构间的学术合作网络。结果2002-2012年,中国学者累计发表血吸虫病相关SCIE论文610篇,占全球总量的16.7%,发文量呈逐年增加趋势。中国疾病预防控制中心寄生虫病预防控制所(寄生虫病所)发文量为114篇,h指数为27,发文量和h指数在国内相关机构中均排名第1位,且在国际学术合作网络中处于核心主导地位。周晓农以h指数17成为血吸虫病防治研究领域的领军人物。结论与世界排名前列的研究机构相比,我国寄生虫病防治科研机构无论是在SCI发文量还是机构h指数方面均存在着较大差距。建议在加强血吸虫病防治和研究的同时,注意防治经验、成果的输出和分享。展开更多
基金Project supported by the National Key R&D Program of China (Grant Nos.2022YFA1603200 and 2022YFA1603203)the National Natural Science Foundation of China (Grant Nos.12075030,12135001,12175018,and 12325305)+3 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDA25030700)the Research Grants Council of Hong (Grant No.14307118)the Youth Interdisciplinary Team (Grant No.JCTD-2022-05)supported by the China Postdoctoral International Exchange Program。
文摘Magnetic reconnection of the self-generated magnetic fields in laser-plasma interaction is an important laboratory method for modeling high-energy density astronomical and astrophysical phenomena.We use the Martin-Puplett interferometer(MPI)polarimeter to probe the peripheral magnetic fields generated in the common magnetic reconnection configuration,two separated coplanar plane targets,in laser-target interaction.We introduce a new method that can obtain polarization information from the interference pattern instead of the sinusoidal function fitting of the intensity.A bidirectional magnetic field is observed from the side view,which is consistent with the magneto-hydro-dynamical(MHD)simulation results of self-generated magnetic field reconnection.We find that the cancellation of reverse magnetic fields after averaging and integration along the observing direction could reduce the magnetic field strength by one to two orders of magnitude.It indicates that imaging resolution can significantly affect the accuracy of measured magnetic field strength.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDA25030700 and XDA25030500)the National Key R&D Program of China (Grant Nos. 2022YFA1603200 and 2022YFA1603203)the National Natural Science Foundation of China (Grant Nos. 12175018, 12135001, 12075030, and 11903006)。
文摘It is challenging to make an ultrafast diagnosis of the temporal evolution of small and short-lived plasma in two dimensions. To overcome this difficulty, we have developed a well-timed diagnostic utilizing an x-ray streak camera equipped with a row of multi-pinhole arrays. By processing multiple sets of one-dimensional streaked image data acquired from various pinholes, we are capable of reconstructing high-resolution two-dimensional images with a temporal resolution of 38 ps and a spatial resolution of 18 μm. The temporal fiducial pulses accessed from external sources can advance the precise timing and accurately determine the arrival time of the laser. Moreover, it can correct the nonlinear sweeping speed of the streak camera. The effectiveness of this diagnostic has been successfully verified at the Shenguang-II laser facility,providing an indispensable tool for observing complex physical phenomena, such as the implosion process of laser-fusion experiments.
文摘目的评价我国血吸虫病防治研究机构的学术影响力。方法以Web of Science(WOS)数据平台的科学引文索引扩展版数据库(Science Citation Index Expanded,SCIE)为数据源,检索2002-2012年血吸虫病研究领域的学术论文(论著或综述),采用文献计量法统计中国机构及作者在SCIE数据库中的发文量、h指数、被引频次等指标,并根据发文量和h指数对机构和作者的学术影响力进行评价。采用CiteSpace II软件绘制科学知识网络图谱,分析机构间的学术合作网络。结果2002-2012年,中国学者累计发表血吸虫病相关SCIE论文610篇,占全球总量的16.7%,发文量呈逐年增加趋势。中国疾病预防控制中心寄生虫病预防控制所(寄生虫病所)发文量为114篇,h指数为27,发文量和h指数在国内相关机构中均排名第1位,且在国际学术合作网络中处于核心主导地位。周晓农以h指数17成为血吸虫病防治研究领域的领军人物。结论与世界排名前列的研究机构相比,我国寄生虫病防治科研机构无论是在SCI发文量还是机构h指数方面均存在着较大差距。建议在加强血吸虫病防治和研究的同时,注意防治经验、成果的输出和分享。
