维普中文期刊产品整合服务
2篇 您的检索式:作者名="R. E Drake"
    题名 作者 年代 出处 被引量
1Conceptual design of an experiment to study dust destruction by astrophysical shock waves显示文摘A novel laboratory experimental design is described that will investigate the processing of dust grains in astrophysical shocks. Dust is a ubiquitous ingredient in the interstellar medium(ISM) of galaxies; however, its evolutionary cycle is still poorly understood. Especially shrouded in mystery is the efficiency of grain destruction by astrophysical shocks generated by expanding supernova remnants. While the evolution of these remnants is fairly well understood, the grain destruction efficiency in these shocks is largely unknown. The experiments described herein will fill this knowledge gap by studying the dust destruction efficiencies for shock velocities in the range ~10–30 km/s(μm/ns), at which most of the grain destruction and processing in the ISM takes place. The experiments focus on the study of grain–grain collisions by accelerating small(~1 μm) dust particles into a large(~5–10 μm diameter) population; this simulates the astrophysical system well in that the more numerous, small grains impact and collide with the large population. Facilities that combine the versatility of high-power optical lasers with the diagnostic capabilities of X-ray free-electron lasers, e.g., the Matter in Extreme Conditions instrument at the SLAC National Accelerator Laboratory, provide an ideal laboratory environment to create and diagnose dust destruction by astrophysically relevant shocks at the micron scale.M. J.-E. Manuel T. Temim E. Dwek A. M. Angulo E X. Belancourt R. E Drake C. C. Kuranz M. J. MacDonald B. A. Remington 2018High Power Laser Science and Engineering2018,6,3:0
2Experimental platform for the investigation of magnetized-reverse-shock dynamics in the context of POLAR显示文摘The influence of a strong external magnetic field on the collimation of a high Mach number plasma flow and its collision with a solid obstacle is investigated experimentally and numerically. The laser irradiation(I ~ 2 × 10^(14) W · cm^(-2)) of a multilayer target generates a shock wave that produces a rear side plasma expanding flow. Immersed in a homogeneous10 T external magnetic field, this plasma flow propagates in vacuum and impacts an obstacle located a few mm from the main target. A reverse shock is then formed with typical velocities of the order of 15–20 ± 5 km/s. The experimental results are compared with 2 D radiative magnetohydrodynamic simulations using the FLASH code. This platform allows investigating the dynamics of reverse shock, mimicking the processes occurring in a cataclysmic variable of polar type.B. Albertazzi E. Falize A. Pelka E Brack E Kroll R. Yurchak E. Brambrink E Mabey N. Ozaki S. Pikuz L. Van Box Som J. M. Bonnet-Bidaud J. E. Cross E. Filippov G. Gregori R. Kodama M. Mouchet T. Morita Y. Sakawa R. E Drake C. C. Kuranz M. J.-E. Manuel C. Li E Tzeferacos D. Lamb U. Schramm M. Koenig 2018High Power Laser Science and Engineering2018,6,3:0
返回顶部 每页显示:
共1页 首页 上一页 第1页 下一页 末页 /1 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费