Publications (12)
Structure of self-generated magnetic fields in laser-solid interaction from proton tomography
Jesse Griff-McMahon, Christopher A. Walsh, Vicente Valenzuela-Villaseca +9
Strong magnetic fields are naturally self-generated in high-power, laser-solid interactions through the Biermann-battery mechanism. This work experimentally characterizes the 3D lo…
Ultrafast proton radiography of the magnetic fields generated by a laser-driven coil current
Lan Gao, Hantao Ji, Gennady Fiksel +3
Magnetic fields generated by a current flowing through a U-shaped coil connecting two copper foils were measured using ultrafast proton radiography. Two 1.25 kJ, 1-ns laser p…
Geometric scaling of laser-driven proton focusing from hemispherical foils
Jesse Griff-McMahon, Xavier Vaisseau, William Fox +7
We systematically characterize the focusing behavior of laser-driven proton beams from hemispherical targets of various diameters using mesh radiography. The proton focal location…
Reconstruction of 2D line-integrated electron density using angular filter refractometry and a fast marching Eikonal solver
Brendan McCluskey, Jesse Griff-McMahon, Daniel Haberberger +3
Refraction of an optical probe beam by a plasma can be measured with angular filter refractometry (AFR), which produces an image containing intensity contours that correspond to cu…
Investigation of P levels near the proton threshold by Nuclear Resonance Fluorescence and the impact on the Si(p,)P thermonuclear rate
David Gribble, Christian Iliadis, Robert V. F. Janssens +13
We investigated the nuclear structure of P near the proton threshold using Nuclear Resonance Fluorescence (NRF) to refine the properties of key resonances in the Si(p…
High Resolution Study of Ca to Constrain Potassium Nucleosynthesis in NGC 2419
William Fox, Richard Longland, Caleb Marshall +1
The globular cluster NGC 2419 was the first to exhibit a Mg-K anticorrelation, linked to hydrogen burning at temperatures between 80-260 MK. However, the key K-destroying reaction,…
Momentum transport and nonlocality in heat-flux-driven magnetic reconnection in high energy density plasmas
Chang Liu, William Fox, Amitava Bhattacharjee +2
Recent theory has demonstrated a novel physics regime for magnetic reconnection in high-energy-density plasmas where the magnetic field is advected by heat flux via the Nernst effe…
The Plasma Simulation Code: A modern particle-in-cell code with load-balancing and GPU support
Kai Germaschewski, William Fox, Stephen Abbott +5
Recent increases in supercomputing power, driven by the multi-core revolution and accelerators such as the IBM Cell processor, graphics processing units (GPUs) and Intel's Many Int…
Two-dimensional plasma density evolution local to the inversion layer during sawtooth crash events using Beam Emission Spectroscopy
Sayak Bose, William Fox, Dingyun Liu +4
We present methods for analyzing Beam Emission Spectroscopy (BES) data to obtain the plasma density evolution associated with rapid sawtooth crash events at the DIII-D tokamak. BES…
Instability-Enhanced Friction in the Presheath of Two-Ion-Species Plasmas
Scott D. Baalrud, Trevor Lafleur, William Fox +1
The speed at which ions enter a sheath is a fundamental property of a plasma that also provides a useful boundary condition in modeling. A recent theory proposed that this can be s…
An Obliquely Propagating Electromagnetic Drift Instability in the Lower Hybrid Frequency Range
Hantao Ji, Russell Kulsrud, William Fox +1
By employing a local two-fluid theory, we investigate an obliquely propagating electromagnetic instability in the lower hybrid frequency range driven by cross-field current or rela…
Proton Imaging of High-Energy-Density Laboratory Plasmas
Derek B. Schaeffer, Archie F. A. Bott, Marco Borghesi +8
Proton imaging has become a key diagnostic for measuring electromagnetic fields in high-energy-density (HED) laboratory plasmas. Compared to other techniques for diagnosing fields,…