Radiative signatures of Z-pinch plasmas at UNR: from X-pinches to wire arrays

2014 ◽  
Vol 32 ◽  
pp. 1460316 ◽  
Author(s):  
A. S. Safronova ◽  
V. L. Kantsyrev ◽  
A. A. Esaulov ◽  
U. I. Safronova ◽  
V. V. Shlyaptseva ◽  
...  
Keyword(s):  
Wire Array ◽  
High Energy ◽  
High Energy Density ◽  
The Novel ◽  
Plasma Parameters ◽  
Experimental Conditions ◽  
Cross Point ◽  
Wire Arrays ◽  
Z Pinch ◽  
Pinch Axis

University-scale Z-pinch generators are able to produce High Energy Density (HED) plasmas in a broad range of plasma parameters under well-controlled and monitored experimental conditions suitable for radiation studies. The implosion of X-pinch and wire array loads at a 1 MA generator yields short (1-20 nsec) x-ray bursts from one or several bright plasma spots near the wire cross point (for X-pinches) or along and near Z-pinch axis (for wire arrays). Such X- and Z-pinch HED plasma with scales from a few µm to several mm in size emits radiation in a broad range of energies from 10 eV to 0.5 MeV and is subject of our studies during the last ten years. In particular, the substantial number of experiments with very different wire loads was performed on the 1 MA Zebra generator and analyzed: X-pinch, cylindrical, nested, and various types of the novel load, Planar Wire Arrays (PWA). Also, the experiments at an enhanced current of 1.5-1.7 MA on Zebra using Load Current Multiplier (LCM) were performed. This paper highlights radiative signatures of X-pinches and Single and Double PWAs which are illustrated using the new results with combined wire loads from two different materials.

Multi-dimensional high energy density physics modeling and simulation of wire array Z-pinch physics

2004 ◽  
Vol 11 (5) ◽  
pp. 2729-2737 ◽  
Author(s):  
C. J. Garasi ◽  
D. E. Bliss ◽  
T. A. Mehlhorn ◽  
B. V. Oliver ◽  
A. C. Robinson ◽  
...  
Keyword(s):  
Energy Density ◽  
Modeling And Simulation ◽  
Wire Array ◽  
High Energy ◽  
High Energy Density ◽  
High Energy Density Physics ◽  
Physics Modeling ◽  
Z Pinch

scholarly journals Comparison of Heat Transfer Enhancement Techniques in Latent Heat Storage

2020 ◽  
Vol 10 (16) ◽  
pp. 5519 ◽  
Author(s):  
William Delgado-Diaz ◽  
Anastasia Stamatiou ◽  
Simon Maranda ◽  
Remo Waser ◽  
Jörg Worlitschek
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Latent Heat ◽  
Heat Transfer Performance ◽  
Thermal Power ◽  
High Energy ◽  
High Energy Density ◽  
Evaluation Procedure ◽  
Transfer Performance ◽  
Experimental Conditions

Latent Heat Energy Storage (LHES) using Phase Change Materials (PCM) is considered a promising Thermal Energy Storage (TES) approach as it can allow for high levels of compactness, and execution of the charging and discharging processes at defined, constant temperature levels. These inherent characteristics make LHES particularly attractive for applications that profit from high energy density or precise temperature control. Many novel, promising heat exchanger designs and concepts have emerged as a way to circumvent heat transfer limitations of LHES. However, the extensive range of experimental conditions used to characterize these technologies in literature make it difficult to directly compare them as solutions for high thermal power applications. A methodology is presented that aims to enable the comparison of LHES designs with respect to their compactness and heat transfer performance even when largely disparate experimental data are available in literature. Thus, a pair of key performance indicators (KPI), ΦPCM representing the compactness degree and NHTPC, the normalized heat transfer performance coefficient, are defined, which are minimally influenced by the utilized experimental conditions. The evaluation procedure is presented and applied on various LHES designs. The most promising designs are identified and discussed. The proposed evaluation method is expected to open new paths in the community of LHES research by allowing the leveled-ground contrast of technologies among different studies, and facilitating the evaluation and selection of the most suitable design for a specific application.

Concept of the high-energy photon emission from the wire array Z-pinch

2001 ◽  
Author(s):  
P. Kubes ◽  
J. Kravarik ◽  
D. Klir ◽  
Yu. L. Bakshaev ◽  
P. I. Blinov ◽  
...  
Keyword(s):  
Wire Array ◽  
Photon Emission ◽  
High Energy ◽  
High Energy Photon ◽  
Energy Photon ◽  
The Wire ◽  
Z Pinch

Cylindrical liner Z-pinch experiments for fusion research and high-energy-density physics

2015 ◽  
Vol 81 (3) ◽  
Author(s):  
G. C. Burdiak ◽  
S. V. Lebedev ◽  
F. Suzuki-Vidal ◽  
G. F. Swadling ◽  
S. N. Bland ◽  
...  
Keyword(s):  
Shock Waves ◽  
Radiation Transport ◽  
Axial Magnetic Field ◽  
Wave Structure ◽  
High Energy ◽  
High Energy Density ◽  
Material Strength ◽  
Bulk Motion ◽  
Strength Models ◽  
Z Pinch

A gas-filled cylindrical liner z-pinch configuration has been used to drive convergent radiative shock waves into different gases at velocities of 20–50 km s−1. On application of the 1.4 MA, 240 ns rise-time current pulse produced by the Magpie generator at Imperial College London, a series of cylindrically convergent shock waves are sequentially launched into the gas-fill from the inner wall of the liner. This occurs without any bulk motion of the liner wall itself. The timing and trajectories of the shocks are used as a diagnostic tool for understanding the response of the liner z-pinch wall to a large pulsed current. This analysis provides useful data on the liner resistivity, and a means to test equation of state (EOS) and material strength models within MHD simulation codes. In addition to providing information on liner response, the convergent shocks are interesting to study in their own right. The shocks are strong enough for radiation transport to influence the shock wave structure. In particular, we see evidence for both radiative preheating of material ahead of the shockwaves and radiative cooling instabilities in the shocked gas. Some preliminary results from initial gas-filled liner experiments with an applied axial magnetic field are also discussed.

scholarly journals The importance of EBIT data for Z-pinch plasma diagnostics

2008 ◽  
Vol 86 (1) ◽  
pp. 267-276 ◽  
Author(s):  
A S Safronova ◽  
V L Kantsyrev ◽  
P Neill ◽  
U I Safronova ◽  
D A Fedin ◽  
...  
Keyword(s):  
Electron Beam ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Theoretical Models ◽  
High Energy ◽  
High Energy Density ◽  
Strong Electron ◽  
Model Calculations ◽  
X Ray ◽  
Z Pinch

The results from the last six years of X-ray spectroscopy and spectropolarimetry of high-energy density Z-pinch plasmas complemented by experiments with the electron beam ion trap (EBIT) at the Lawrence Livermore National Laboratory (LLNL) are presented. The two topics discussed are the development of M-shell X-ray W spectroscopic diagnostics and K-shell Ti spectropolarimetry of Z-pinch plasmas. The main focus is on radiation from a specific load configuration called an “X-pinch”. In this work the study of X-pinches with tungsten wires combined with wires from other, lower Z materials is reported. Utilizing data produced with the LLNL EBIT at different energies of the electron beam the theoretical prediction of line positions and intensity of M-shell W spectra were tested and calibrated. Polarization-sensitive X-pinch experiments at the University of Nevada, Reno (UNR) provide experimental evidence for the existence of strong electron beams in Ti and Mo X-pinch plasmas and motivate the development of X-ray spectropolarimetry of Z-pinch plasmas. This diagnostic is based on the measurement of spectra recorded simultaneously by two spectrometers with different sensitivity to the linear polarization of the observed lines and compared with theoretical models of polarization-dependent spectra. Polarization-dependent K-shell spectra from Ti X-pinches are presented and compared with model calculations and with spectra generated by a quasi-Maxwellian electron beam at the LLNL EBIT-II electron beam ion trap.PACS Nos.: 32.30.Rj, 52.58.Lq, 52.70.La

Laser and Z-pinch Simulation of High Energy Density Planetary Interactions

2010 ◽  
Author(s):  
John L. Remo ◽  
Stein B. Jacobsen ◽  
Claude Phipps
Keyword(s):  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Z Pinch

The propagation of linear waves in high-energy-density magnetoplasmas using a relativistic quantum magnetohydrodynamic model

2021 ◽  
Vol 87 (2) ◽  
Author(s):  
Jun Zhu ◽  
Xiaoshan Liu ◽  
Li Jia
Keyword(s):  
Energy Density ◽  
Relativistic Quantum ◽  
Relativistic Effects ◽  
Quantum Effects ◽  
High Energy ◽  
High Energy Density ◽  
Plasma Parameters ◽  
Linear Waves ◽  
Background Magnetic Field ◽  
Magnetohydrodynamic Model

The propagation characteristics of linear waves in high-energy-density magnetoplasmas are investigated using a relativistic magnetohydrodynamic model based on the framework of relativistic quantum theory. Based on the covariant Wigner function approach, a relativistic quantum magnetohydrodynamic model is established. Starting from the relativistic quantum magnetohydrodynamic equations and the Maxwell equations, the dispersion equation for relativistic quantum magnetoplasmas is derived. The contributions of both quantum effects and relativistic effects are shown in the dispersion relations for perpendicular, parallel propagation with respect to a background magnetic field. Results show that the corrections of both quantum effects and relativistic effects are significant when choosing the plasma parameters of laser-based plasma compression schemes.

scholarly journals Scaling stellar jets to the laboratory: The power of simulations

2009 ◽  
Vol 27 (4) ◽  
pp. 709-717 ◽  
Author(s):  
C. Stehlé ◽  
A. Ciardi ◽  
J.-P. Colombier ◽  
M. González ◽  
T. Lanz ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Laboratory Experiments ◽  
Scaling Laws ◽  
Laser System ◽  
High Energy ◽  
Laboratory Astrophysics ◽  
High Energy Density ◽  
Radiative Shocks ◽  
Stellar Jets ◽  
Z Pinch

AbstractAdvances in laser and Z-pinch technology, coupled with the development of plasma diagnostics, and the availability of high-performance computers, have recently stimulated the growth of high-energy density laboratory astrophysics. In particular, a number of experiments have been designed to study radiative shocks and jets with the aim of shedding new light on physical processes linked to the ejection and accretion of mass by newly born stars. Although general scaling laws are powerful tools to link laboratory experiments with astrophysical plasmas, the phenomena modeled are often too complicated for simple scaling to remain relevant. Nevertheless, the experiments can still give important insights into the physics of astrophysical systems and can be used to provide the basic experimental validation of numerical simulations in regimes of interest to astrophysics. We will illustrate the possible links between laboratory experiments, numerical simulations, and astrophysics in the context of stellar jets. First we will discuss the propagation of stellar jets in a cross-moving interstellar medium and the scaling to Z-pinch produced jets. Our second example focuses on slab-jets produced at the Prague Asterix Laser System laser installation and their practical applications to astrophysics. Finally, we illustrate the limitations of scaling for radiative shocks, which are found at the head of the most rapid stellar jets.

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