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2021 IEEE Photovoltaic Specialists Conference (PVSC)
Photovoltaic materials, devices, systems and related science and technology
2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting
The joint meeting is intended to provide an international forum for the exchange of information on state of the art research in the area of antennas and propagation, electromagnetic engineering and radio science
ECTC is the premier international conference sponsored by the IEEE Components, Packaging and Manufacturing Society. ECTC paper comprise a wide spectrum of topics, including 3D packaging, electronic components, materials, assembly, interconnections, device and system packaging, optoelectronics, reliability, and simulation.
IEEE International Conference on Plasma Science (ICOPS) is an annual conference coordinated by the Plasma Science and Application Committee (PSAC) of the IEEE Nuclear & Plasma Sciences Society.
The International Conference on Robotics and Automation (ICRA) is the IEEE Robotics and Automation Society’s biggest conference and one of the leading international forums for robotics researchers to present their work.
The IEEE Transactions on Advanced Packaging has its focus on the modeling, design, and analysis of advanced electronic, photonic, sensors, and MEMS packaging.
Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.
IEEE Antennas and Wireless Propagation Letters (AWP Letters) will be devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation.
Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission
The Transactions on Biomedical Circuits and Systems addresses areas at the crossroads of Circuits and Systems and Life Sciences. The main emphasis is on microelectronic issues in a wide range of applications found in life sciences, physical sciences and engineering. The primary goal of the journal is to bridge the unique scientific and technical activities of the Circuits and Systems ...
2009 IEEE International Conference on Plasma Science - Abstracts, 2009
Summary form only given. Recently, radiative properties of implosions of new Z-pinch loads such as compact single and double planar wire arrays (PWA) and cylindrical wire arrays, uniform as well as combined from different wire materials were extensively studied. In particular, K-shell radiation of Al and Mg from implosions of compact single planar and cylindrical wire arrays and L-shell Mo ...
2011 Abstracts IEEE International Conference on Plasma Science, 2011
Summary form only given. We continue to study the physics of wire arrays and to search for more efficient X-ray radiators from wire array Z-pinch plasmas. Two important questions are addressed in this talk. First, what are the main contributions in the total radiation yield? To consider this question, we divided the time interval of the Z-pinch dynamics where wire ...
2009 IEEE International Conference on Plasma Science - Abstracts, 2009
Summary form only given. EUV spectroscopy is a feasible tool for diagnosing of Z-pinch plasma before and after stagnation in complement to X-ray spectroscopy, which is conventionally used in studying of the stagnating hot dense plasmas. A collection of aluminum EUV spectra from implosions of traditional cylindrical wire arrays and new planar wire arrays (PWA) on the 1 MA Zebra ...
2008 IEEE 35th International Conference on Plasma Science, 2008
Summary form only given. Analysis is presented on scaling of radiated x-ray power, energy and implosion timing of single and double planar wire array loads of Al, Cu, Mo, and W with respect to mass, width, and inter-planar spacing at IMA and 100ns current pulse. Such scaling investigations are important for understanding the potential of planar wire arrays as a ...
IEEE Conference Record - Abstracts. PPPS-2001 Pulsed Power Plasma Science 2001. 28th IEEE International Conference on Plasma Science and 13th IEEE International Pulsed Power Conference (Cat. No.01CH37, 2001
Summary form only given, as follows. We report on the implosion dynamics of single nickel and copper wire arrays on the MAGPIE generator with a 1.4 MA, 240 ns current pulse. Plasma formed from individual wires has a core-corona structure. In the nickel arrays, a core size of 75 /spl mu/m is measured by X-ray radiography. The formation of precursor ...
Random Sparse Adaptation for Accurate Inference with Inaccurate RRAM Arrays - IEEE Rebooting Computing 2017
IEEE N3XT @ SXSW 2016: Chris Wire, KRUSH
Concept of Arrays
Micro-Apps 2013: Design and Simulation of Phased Arrays in VSS
5G mmW Phased Arrays - Future X Radio Panel Talk - Baljit Singh - Brooklyn 5G Summit 2018
A 28GHz CMOS Direct Conversion Transceiver with Packaged Antenna Arrays for 5G Cellular Systems: RFIC Industry Showcase 2017
5G UE Phased Array Design - Future X Radio Panel Talk - Ozge Koymen - Brooklyn 5G Summit 2018
Massive MIMO Active Antenna Arrays for Advanced Wireless Communications: IEEE CAS lecture by Dr. Mihai Banu
mmwave Phased Arrays for 5G Applications - Challenges and Opportunities - Ian Gresham: Brooklyn 5G Summit 2017
IMS 2014: LNA Modules for the WR4 (170-260 GHz) Frequency Range
The AcceleGlove: A Cheap and Lightweight Control Glove
A 73GHz PA for 5G Phased Arrays in 14nm FinFET CMOS: RFIC Industry Showcase 2017
Abbas El Gamal accepts the IEEE Richard W. Hamming Medal - Honors Ceremony 2016
Q&A with Cindy Chestek: IEEE Brain Podcast, Episode 12
Brooklyn 5G - 2015 - Dr. Amitabha Ghosh & Dr. Timothy A. Thomas - 5G Channel Modeling from 6 to 100 GHz: Critical Modeling Aspects and Their Effect on System Design and Performance
CASS Lecture by Dr. Chris Hull, "Millimeter-Wave Power Amplifiers in FinFET Technology"
A Comparator Design Targeted Towards Neural Net - David Mountain - ICRC San Mateo, 2019
Laser Communication From Space Using Superconducting Detectors - ASC-2014 Plenary series - 12 of 13 - Friday 2014/8/15
Summary form only given. Recently, radiative properties of implosions of new Z-pinch loads such as compact single and double planar wire arrays (PWA) and cylindrical wire arrays, uniform as well as combined from different wire materials were extensively studied. In particular, K-shell radiation of Al and Mg from implosions of compact single planar and cylindrical wire arrays and L-shell Mo radiation from the implosion of compact single and double PWAs on the 1 MA UNR Zebra generator were modeled. In the present work, we study radiative performance of the new types of Al PWAs and compact alternate cylindrical wire arrays. Specifically, we have spectroscopically modeled radiation from Al-5056 double planar wire arrays (DPWA) and prism-like planar wire arrays (PPWA). DPWAs were studied in two configurations: with wires arranged straight along the z-axis or skewed wires. Alternate Al wire arrays, where Al and Mo wires were arranged in an alternating pattern, have been considered. X-ray time-gated and time integrated spectra and pinhole images, PCD and XRD current signals were analyzed. Previously developed non-LTE models were applied to model axially resolved time integrated as well as time-gated spatially integrated K-shell spectra from Al and Mg and L-shell Mo spectra. Derived electron temperature, density and opacity axial gradients were studied and compared. Furthermore, bright spot generations and correlations between time integrated spectra and pinhole images were investigated. In addition, WADM was used to study the implosion dynamics of DPWA and PPWA loads.
Summary form only given. We continue to study the physics of wire arrays and to search for more efficient X-ray radiators from wire array Z-pinch plasmas. Two important questions are addressed in this talk. First, what are the main contributions in the total radiation yield? To consider this question, we divided the time interval of the Z-pinch dynamics where wire ablation, implosion, stagnation, and plasma expansion occur in three time zones and studied the radiative and implosion characteristics within each. The second question is how does the distribution of the radiated energy within these three time zones depend on the configuration of the load and wire materials. The experiments were performed on the 1 MA Zebra generator at UNR with a full set of diagnostics that included 10 beam lines. In particular, PCD, XRD, and EUV detectors, X-ray/EUV spectrometers and X-ray pinhole cameras, and laser shadowgraphy were utilized. We collected and analyzed the experimental results from single and nested cylindrical as well as single and double planar wire arrays. A broad range of wire materials were explored from low-Z (Al) to moderate mid-Z (Fe, Ni, and Cu) and higher mid-Z (Mo and Ag). The strong dependence of the distribution of radiation energy between the three zones on the load configuration was observed. Z-pinch dynamics and both X-ray and EUV radiative properties in all three time zones were considered. A precursor plasma in the first zone from cylindrical wire arrays as well as the plasma in the second zone at stagnation from cylindrical and planar wire arrays are discussed. A special emphasis was put on the time evolution of EUV radiation in all three zones and in particular on its substantial value in the third zone after stagnation. Future directions of this work are discussed.
Summary form only given. EUV spectroscopy is a feasible tool for diagnosing of Z-pinch plasma before and after stagnation in complement to X-ray spectroscopy, which is conventionally used in studying of the stagnating hot dense plasmas. A collection of aluminum EUV spectra from implosions of traditional cylindrical wire arrays and new planar wire arrays (PWA) on the 1 MA Zebra generator at UNR are being analyzed in this work. Al PWA loads were uniform and combined with Mo wires. Also, the EUV spectra and images from experiments with combined aluminum and stainless steel alloy 304, nested wire arrays from the IMA COBRA generator at Cornell University are presented. The loads consisted of 8 or 16 wires of different materials in outer and inner arrays: stainless steel or aluminum. Non-LTE Al model was used to identify EUV spectra and to estimate plasma parameters. The special emphasis was made on study of dependence of Al EUV spectra on the type and composition of the load. WADM and radiation MHD simulations have been performed to model the load implosion, analyze the EUV images and calculate the bulk temperature of the precursor plasma column. In addition, we study the aluminum EUV spectra, recorded at the laser plasma facility "Sparky" at UNR. These spectra help to benchmark our spectroscopic models and identify the Z-pinch spectra.
Summary form only given. Analysis is presented on scaling of radiated x-ray power, energy and implosion timing of single and double planar wire array loads of Al, Cu, Mo, and W with respect to mass, width, and inter-planar spacing at IMA and 100ns current pulse. Such scaling investigations are important for understanding the potential of planar wire arrays as a radiation source. These data are used to identify promising directions to pursue with regard to highest x-ray output, smallest load size, and most consistent shot- to-shot performance. X-ray data were obtained from a Ni bolometer, an array of fast x-ray diodes, time-gated and time-integrated x-ray pinhole cameras, and time-gated and time-integrated x-ray spectrometers. It is shown that double planar wire array radiation yields decrease slowly as the width is decreased, which may allow for more compact loads without significant sacrifice to the output radiation. A mass scan of several W loads show that the implosion timing increases with mass while a width scan of Al loads reveal that implosion timing increases with width. Double planar array scans of inter- planar gaps from 1.5mm to 9mm show an output maximum at 1.5mm with decreasing output for 6mm and 9mm. In addition to raw data analysis, the novel Wire Ablation Dynamics Model is applied to better understand results by identifying how dynamic processes change as a specific parameter is varied and by 'stretching' the experimental data to reveal useful trends.
Summary form only given, as follows. We report on the implosion dynamics of single nickel and copper wire arrays on the MAGPIE generator with a 1.4 MA, 240 ns current pulse. Plasma formed from individual wires has a core-corona structure. In the nickel arrays, a core size of 75 /spl mu/m is measured by X-ray radiography. The formation of precursor on axis takes place at about 150 ns. Initially the precursor plasma is stable but shows an m=1 instability later in time. The implosion of the array occurs later than that predicted by a 0-D model, indicating that a fraction of the current flows through the precursor plasma. Like aluminum and tungsten, the m=1 instability in the precursor plasma is not observed in the copper arrays, and the implosion time is in accordance with a 0-D model. This implies that the resistivity of the wires play an important role in the dynamics of the wire arrays. Detailed results are presented.
Summary form only given. Triple Planar Wire Arrays (TPWA) consisted from three planes made of Mo (uniform) or from Mo and Al wire planes (combined). Each plane from Mo or Al wires was almost the same mass and therefore the total linear mass of both uniform and combined TPWAs was about 115 μg/cm. The previous results with 3 mm between planes are revisited. New experiments with the same TPWAs but with a reduced interwire gap of 1.5 mm that showed high yield of 25 kJ (close to the highest yield from Mo double planar wire arrays) are presented and analyzed. In addition, implosion dynamics and radiative properties of combined nested cylindrical wire arrays (NCWA) made of the same size Mo and Al wires (as in TPWAs) were compared with TPWAs, and similarity and differences are discussed. All experiments were performed on the Zebra generator at UNR. A set of diagnostics included fast, filtered x-ray diodes; a Ni bolometer; laser shadowgraphy and streak setups; time-gated and time- integrated x-ray pinhole cameras; and time-integrated spatially resolved (TISR) and time-gated spatially-integrated (TGSI) x-ray spectrometers. Implosion dynamics were analyzed with the wire ablation dynamics model. Non- LTE kinetic modeling was utilized to derive plasma electron temperature and density and to estimate opacity effects in K-shell Al lines. In particular, spatially resolved L-shell Mo plasma parameters were determined from TISR spectra. Time-gated (from TGSI data) and spatially-resolved (from TISR data) K-shell Al and Mg plasma parameters were modeled. In result, a comprehensive analysis and comparison of L-shell and K-shell plasma parameters for TPWAs with different geometries as well as for NCWAs was accomplished. Future directions of this work are discussed.
Since the first wire-array tungsten (W) experiments on Z at SNL, where the record x-ray power of 200 TW and x-ray yield of nearly 2 MJ were achieved1, such arrays were actively studied and considered for various applications including inertial confinement fusion (ICF)2. More recently, W Double Planar Wire Arrays (DPWAs) were suggested and tested for indirect drive ICF3. DPWA consists of two parallel planes of wires of the same (uniform) or different (mixed) wire materials. W DPWAs have previously demonstrated the highest (among PWAs) radiation yield (up to 30 kJ), compact size (few mm), and strong electron beams at the University-scale high-impedance generator3. During the last few years we have reported on the outcome of the experiments with uniform and mixed Al and stainless steel DPWAs on the University of Michigan's low- impedance Linear Transformer Driver (LTD) MAIZE generator. Here we present the results of the most recent campaign with W and W/Al DPWAs recorded using filtered x-ray diodes, x-ray spectrometers and pinhole cameras, and a twelve frame shadowgraphy system. For the first time, implosion of W wire arrays on LTD generator in USA was demonstrated and analyzed. In particular, uniform W and mixed W/Al DPWAs with a mass up to 87 μg arranged in various configurations were successfully imploded at the current of 0.5 MA during ~210 ns. The most interesting results were obtained with W/Al DPWAs where a long- term standing shock wave was consistently formed at the W side, which was also observed at the high-impedance Zebra generator at UNR. In addition, soft (4-7 Å) and hard (1-2.4 Å) line radiation was substantially suppressed by including the Al plane.
Summary form only given. A university-scale Z-pinch generator is able to produce HED plasmas within a broad range of temperatures and densities depending on the type of load configurations and wire materials. Experiments with very different Z-pinch loads were performed on 1 MA Zebra generator at UNR and analyzed during the last five years: X-pinch, Cylindrical, Nested, and various types of Planar Wire Arrays (PWA). X-pinches are very good sources of x-rays and can be used for studying radiative properties of high density (>10<sup>22</sup> cm<sup>-3</sup>) and temperature (> 2 keV) plasmas with scales from a few ?m to several mm in size. They yield short (few nsec) x-ray bursts from one or several bright plasma spots near the wire cross point and produce strong electron beams as well as plasma jets. PWAs, a new type of the wire array load, were tested in single and multi-plane configurations. It was shown that PWAs may produce significant radiation yield in a ns-scale (up to 25 kJ) and generate bright spots of sub-mm size. The main focus of this presentation is the comparative analysis of the results from recent experiments with the X-pinch, Cylindrical and Nested Wire Arrays and PWAs made from stainless steel wires. The diagnostic set included XRD and PCD detectors, laser shadowgraphy, x-ray time-gated and time integrated imaging, time integrated spatially resolved spectrometers for harder (K- shell) and softer (L-shell) x-ray regions, and a time-gated spatially integrated spectrometer for the softer (L-shell) x-ray region. The non-LTE kinetic, WADM, and MHD codes are used to guide the analysis of the results. In particular, the new results for X-pinches with different angles between the wires are presented and their relevance to astrophysics is demonstrated. The new results from the experiments with above-mentioned wire array loads focus on the study of precursor formation as well as plasma evolution at the stagnation phase. The unique properties and HED features of such plasmas are summarized and discussed.
In the following experiments, we studied implosions of different wire arrays and X-pinches produced on the 1-MA Zebra generator at the University of Nevada, Reno. Diagnostics included both spatially-resolved and time-gated X-ray imaging and spectroscopy, and laser probing. In particular, we compared planar wire arrays, to which little energy could be coupled via the conventional magnetic-to-kinetic conversion mechanism, to cylindrical wire arrays of comparable dimensions and mass. The planar wire arrays were shown to radiate much higher peak power and more energy in subkiloelectronvolt and kiloelectronvolt spectral ranges than cylindrical wire arrays. We tested the theoretical conjecture that enhanced resistivity due to the small-scale inhomogeneity of wire-array plasmas has a major effect on dynamics, energy coupling and radiation performance of wire-array Z-pinches. The study of Al, Alumel, and W cylindrical wire arrays shows a wide variety of characteristic behaviors in plasma implosions discussed hereinafter. Additional experimental results for symmetric and asymmetric, uniform stainless steel, Cu, Mo, combined Al/Mo, Mo/Al, Al/W, W/Al, and Mo/W X-pinches are also presented. New data for the total radiation yield are obtained. The planar structures of X-pinch plasma and the corresponding electron beam was observed for most of X-pinches. The generation of hot spots along original wires positions-cooler than those from the cross-wire region-and arc structures with hot spots between wires were found for X-pinches composed from Al, Cu, and W wires.
Summary form only given. Compact double and triple planar wire arrays (DPWA and TPWA) demonstrated the largest resistive energy and power gain, and the highest current scaling among all tested loads at the UNR Zebra generator. Knowledge of the spatial distribution of x-ray radiation from the plasma source is crucial for ICF and radiation physics applications of PWAs [B. Jones et al., PRL, v. 104, 125001 (2010)]. New experiments indicated anisotropic emission from PWAs. Experiments were performed on the UNR Zebra generator with a peak current increased from 0.9 up to 1.7 MA by application of a new load current multiplier (LCM) developed and tested in collaboration with Ecole Polytechnique, France, and Sandia National Laboratories. For SPWAs, the total yield registered orthogonally to the array plane (E⊥) was higher than measured along the plane (E∥) and anisotropy ratio was (E⊥/E∥<; 1.7). For DPWAs and TPWAs, the same ratio was a little less, <;1.25 for DPWAs and up to 1.35 for TPWAs. This can be explained by intense absorption of x-ray radiation in the direction of cold trailing mass plasma collected during implosion along the array plane (for SPWAs) and in a direction perpendicular to the array planes (for DPWAs or TPWAs). Another observation that supports the opacity effects for SPWAs was that the time interval between the current start and the moment when the sub-keV radiation pulse began was found to be greater for registration along the array plane compared to collecting perpendicular to the plane (t∥>; t⊥). The ΔtSPWAwas from 3 to 10 ns. However, it was opposite for DPWA (t⊥>; t∥and ΔtDPWAwas up to 8 ns). New results were obtained on x-ray pulse shaping from PWAs. Experiments with DPWA with straight and skewed wires and TPWA have shown a different set of pulse shapes (pre-pulses and pulse “steps” on front of sub-keV burst). The results were in qualitative agreement with predictions made using Wire Ablation Dynamic Model. Future directions of research are discussed.
The scope of this project has been expanded to no only cover power and control cables (per original PAR) but many types of special purpose cables used in the petroleum and chemical industry. This Guide provides the user information on cable standards, specifications, applications, installations, testing and areas of interest on cable pertaining to the petrochemical industry. Special purpose cables ...
This recommended practice provides overhead contact system maintenance practices and procedures including maintenance techniques, site inspection and test procedures, and maintenance tolerances, for heavy rail, light rail, and trolley bus systems.