Development of the MARZ platform (Magnetically Ablated Reconnection on Z) to study astrophysically relevant radiative magnetic reconnection in the laboratory
Abstract not provided.
Publications
Simulations of strong radiatively cooled magnetic reconnection for the MARZ campaign on Z
Abstract not provided.
Experimental demonstration of the lossless coupling of 20 MA of current through scaled transmission lines stressed at >50 MA conditions
Abstract not provided.
Magnetized Bow Shocks in Radiatively Cooled Collisional Plasma Flows
Abstract not provided.
Using scaled power flow experiments at 20 MA to establish the efficacy of load current delivery on a >50 MA next-generation pulsed power facility
Abstract not provided.
Effects of applied axial magnetic fields on current coupling in MagLIF experiments on the Z machine
Abstract not provided.
Simulations and design of MARZ (Magnetically Ablated Reconnection on Z)
Abstract not provided.
Understanding the relationship between current loss and load hardware geometry in Z machine experiments
Abstract not provided.
An overview of magneto-inertial fusion on the Z Machine at Sandia National Laboratories
Abstract not provided.
An overview of magneto-inertial fusion on the Z Machine at Sandia National Laboratories
Abstract not provided.
The inductively driven transmission line: A passively coupled device for diagnostic applications on the Z pulsed power facility
Review of Scientific Instruments
The inductively driven transmission line (IDTL) is a miniature current-carrying device that passively couples to fringe magnetic fields in the final power feed on the Z Pulsed Power Facility. The IDTL redirects a small amount of Z's magnetic energy along a secondary path to ground, thereby enabling pulsed power diagnostics to be driven in parallel with the primary load for the first time. IDTL experiments and modeling presented here indicate that IDTLs operate non-perturbatively on Z and that they can draw in excess of 150 kA of secondary current, which is enough to drive an X-pinch backlighter. Additional experiments show that IDTLs are also capable of making cleaner, higher-fidelity measurements of the current flowing in the final feed.
Laboratory study of the torus instability threshold in solar-relevant, line-tied magnetic flux ropes
Astrophysical Journal
Coronal mass ejections (CMEs) occur when long-lived magnetic flux ropes (MFRs) anchored to the solar surface destabilize and erupt away from the Sun. This destabilization is often described in terms of an ideal magnetohydrodynamic instability called the torus instability. It occurs when the external magnetic field decreases sufficiently fast such that its decay index, n = -z θ(ln B) θz, is larger than a critical value, n > ncr, where ncr = 1.5 for a full, large aspect ratio torus. However, when this is applied to solar MFRs, a range of conflicting values for ncr is found in the literature. To investigate this discrepancy, we have conducted laboratory experiments on arched, line-tied flux ropes and applied a theoretical model of the torus instability. Our model describes an MFR as a partial torus with foot points anchored in a conducting surface and numerically calculates various magnetic forces on it. This calculation yields better predictions of ncr that take into account the specific parameters of the MFR. We describe a systematic methodology to properly translate laboratory results to their solar counterparts, provided that the MFRs have a sufficiently small edge safety factor or, equivalently, a large enough twist. After this translation, our model predicts that ncr in solar conditions falls near ncr ~ 0.9 solar and within a larger range of ncr ~ (0.7, 1.2) solar, depending on the parameters. The methodology of translating laboratory MFRs to their solar counterparts enables quantitative investigations of CME initiation through laboratory experiments. These experiments allow for new physics insights that are required for better predictions of space weather events but are difficult to obtain otherwise.
Analyzing correlations between current coupling efficiencies and varied transmission line and load hardware geometries in Z-machine experiments
Abstract not provided.
Current measurements on Z
Abstract not provided.
Inductively driven transmission lines: Passively coupled devices for driving secondary loads on the Z Pulsed Power Facility
Abstract not provided.
Understanding the relationship between current loss and load hardware geometry in Z machine experiments
Abstract not provided.
First demonstration of an inductively driven X-pinch for diagnosing high energy density experiments on the Z Pulsed Power Facility
Abstract not provided.
Investigating hydrodynamic instabilities in high energy density systems on the Z Machine
Abstract not provided.
Vision for magnetized HED fundamental science experiments on Z
Abstract not provided.
Inductively driven transmission lines (IDTLs): fringe-field-driven devices for powering diagnostic X-ray sources on the Z Pulsed Power Facility
Abstract not provided.
Z Line-VISAR: A Spatially Resolved Load Current Diagnostic at the Z Pulsed Power Facility
Abstract not provided.
A magnetic reconnection fundamental science platform for Z
Abstract not provided.
Multi-Scale Multi-Physics Plasma Hybrid Algorithms Modeling and Simulations
Abstract not provided.
Stagnation performance scaling of Magnetized Liner Inertial Fusion
Abstract not provided.
Spatially and temporally resolved measurements of load current delivery on the Z Pulsed Power Facility using the Z Line VISAR diagnostic
Abstract not provided.
Results 1–25 of 34