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Apache Spark is explored as a tool for analyzing large data sets from the magnetic fusion simulation code XGC1. Implementation details of Apache Spark on the NERSC Edison supercomputer are discussed, including binary file reading, and parameter setup. An unsupervised machine learning algorithm, k-means clustering, is applied to XGC1 particle distribution function data, showing that highly turbulent...
A series of pulsed power driven recent Kr gas-puff experiments on the Sandia National Laboratories Z machine have produced intense X-rays in the multi-keV photon energy range. Krypton spectra from Z pinch implosions can be used to analyze the presence and dynamics of the emitting regions, which could dominate the Kr K- and L-shell yields. This theoretical investigation of highly charged high atomic...
Over the past decade, advances in the laser technology brought about an increase in the maximum achievable laser intensity of six orders. At the same time, the pulse duration was considerably shortened. The interaction of such ultrashort and intense laser pulses with solid targets and dense plasmas is a rapidly developing area of physics. Hence, a growing interest in characterizing as accurately as...
The increasing availability of large scale computing capabilities has accellerated the development of high-fidelity coupled simulations. Such simulations typically involve the integration of models that implement various aspects of the complex phenomena under investigation. Coupled simulations are playing an integral role in fields such as climate modeling, earth systems modeling, rocket simulations,...
Summary form only given. A highly amplified line emission has been observed at 2.86 A in plasmas that are created when an intense laser pulse > 1020 WcrrIcircldquo2 irradiates a gas of xenon clusters1. In this talk, in an effort directed towards explaining this observed behavior, we study the population dynamics in the O-, Ni-, and Co-like ionization stages of Xe where significant amounts of population...
In a virtual sculpture project, we would like to sculpt in real-time very large 3D objects sampled in volume elements (voxels). The drawback of this kind of representation is the important number of voxels required to represent very large and detailed objects. Consequently, that entails important memory cost and computation time issues. In order to allow real-time performance, we propose in this paper...
Electrostatic potential around a small dust charged particle in the near-wall region of a low pressure rf discharge is one of the fundamental problems in the physics of complex (dusty) plasmas because the screening of charged dust particles determines interactions between them and thus governs their dynamics (e.g., formation of dust crystals). An important feature of the plasma-wall transition layer...
Pt-Fe, Pt-Co and Pt-NiCo alloys and multilayer films were prepared on a SiO2 substrate by the dc magnetron sputtering technique. The reflectivity spectra and magnetooptical Kerr spectra of these specimens were measured, and the diagonal and off-diagonal elements of the conductivity tensor were deduced. The results of this work are as follows: (1) The peak energy position of the magnetooptical Kerr...
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