Derek C. Lamppa
A5037163296- Laser-Plasma Interactions and Diagnostics
- Magnetic confinement fusion research
- Pulsed Power Technology Applications
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Electromagnetic Launch and Propulsion Technology
- Laser-induced spectroscopy and plasma
- Fusion materials and technologies
- Cold Fusion and Nuclear Reactions
- Ion-surface interactions and analysis
- Metal and Thin Film Mechanics
- Magneto-Optical Properties and Applications
- Electrostatic Discharge in Electronics
- Magnetic Field Sensors Techniques
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Laser Design and Applications
- Astro and Planetary Science
- Evolutionary Algorithms and Applications
- Combustion and Detonation Processes
- Magnetic Properties and Applications
- Gyrotron and Vacuum Electronics Research
- Particle Accelerators and Free-Electron Lasers
Sandia National Laboratories
2015-2025
Sandia National Laboratories California
2012-2024
University of Michigan
2017
National Nuclear Security Administration
2017
University of Rochester
2017
Energetics (United States)
2017
United States Naval Research Laboratory
2016
Alameda Applied Sciences Corporation (United States)
2012
University of California, Berkeley
2012
National Technical Information Service
2010
This Letter presents results from the first fully integrated experiments testing magnetized liner inertial fusion concept [S. A. Slutz et al., Phys. Plasmas 17, 056303 (2010)], in which a cylinder of deuterium gas with preimposed 10 T axial magnetic field is heated by Z beamlet, 2.5 kJ, 1 TW laser, and magnetically imploded 19 MA, 100 ns rise time current on facility. Despite predicted peak implosion velocity only 70 km/s, fuel reaches stagnation temperature approximately 3 keV, Te≈Ti,...
Pulsed power accelerators compress electrical energy in space and time to provide versatile experimental platforms for high density inertial confinement fusion science. The 80-TW “Z” pulsed facility at Sandia National Laboratories is the largest device world today. Z discharges up 22 MJ of stored its capacitor banks into a current pulse that rises 100 ns peaks as 30 MA low-inductance cylindrical targets. Considerable progress has been made over past 15 years use precision scientific tool....
High current pulsed-power generators efficiently store and deliver magnetic energy to z-pinch targets. We review applications of magnetically driven implosions (MDIs) inertial confinement fusion. Previous research on MDIs wire-array z-pinches for radiation-driven indirect-drive target designs is summarized. Indirect-drive are compared with new targets that imploded by direct application pressure produced the pulse. describe design elements such as larger absorbed energy, magnetized...
Magnetizing the fuel in inertial confinement fusion relaxes ignition requirements by reducing thermal conductivity and changing physics of burn product confinement. Diagnosing level magnetization during is critical to understanding target performance magneto-inertial (MIF) implosions. In pure deuterium plasma, 1.01 MeV tritons are emitted deuterium-deuterium can undergo secondary deuterium-tritium reactions before exiting fuel. Increasing elongates path lengths through some tritons,...
Novel experimental data are reported that reveal helical instability formation on imploding $z$-pinch liners premagnetized with an axial field. Such instabilities differ dramatically from the mostly azimuthally symmetric form unmagnetized liners. The structure persists at nearly constant pitch as liner implodes. This is surprising since, surface, azimuthal drive field presumably dwarfs for all but earliest stages of experiment. These fundamentally 3D results provide a unique and challenging...
We present experimental results from the first systematic study of performance scaling with drive parameters for a magnetoinertial fusion concept. In magnetized liner inertial experiments, burn-averaged ion temperature doubles to 3.1 keV and primary deuterium-deuterium neutron yield increases by more than an order magnitude 1.1×10^{13} (2 kJ deuterium-tritium equivalent) through simultaneous increase in applied magnetic field (from 10.4 15.9 T), laser preheat energy 0.46 1.2 kJ), current...
Abstract We present an overview of the magneto-inertial fusion (MIF) concept Magnetized Liner Inertial Fusion (MagLIF) pursued at Sandia National Laboratories and review some most prominent results since initial experiments in 2013. In MagLIF, a centimeter-scale beryllium tube or ‘liner’ is filled with fuel, axially pre-magnetized, laser pre-heated, finally imploded using up to 20 MA from Z machine. All these elements are necessary generate thermonuclear plasma: preheating raises temperature...
The magnetized liner inertial fusion concept [S. A. Slutz et al., Phys. Plasmas 17, 056303 (2010)] utilizes a magnetic field and laser heating to relax the pressure requirements of confinement fusion. first experiments test [M. R. Gomez Rev. Lett. 113, 155003 (2014)] were conducted utilizing 19 MA, 100 ns Z machine, 2.5 kJ, 1 TW Beamlet laser, 10 T Applied B-field on system. Despite an estimated implosion velocity only 70 km/s in these experiments, electron ion temperatures at stagnation as...
Recent experiments at the Sandia National Laboratories Z Facility have, for first time, studied implosion dynamics of magnetized liner inertial fusion (MagLIF) style liners that were pre-imposed with a uniform axial magnetic field. As reported [T. J. Awe et al., Phys. Rev. Lett. 111, 235005 (2013)] when premagnetized 7 or 10 T field, these developed 3D-helix-like hydrodynamic instabilities; such instabilities starkly contrast azimuthally correlated magneto-Rayleigh-Taylor (MRT) have been...
X-ray imaging indicates magnetized liner inertial fusion (MagLIF) stagnation columns have a complicated quasi-helical structure with significant variations in x-ray brightness along the column. In this work, we describe MagLIF experiments aimed at controlling these structures by varying initial geometry and composition. First, aspect ratio of liner, demonstrate change that is consistent helical magneto Rayleigh–Taylor (MRT) instabilities feedthrough from outer-to-inner surfaces liner....
Sandia has successfully integrated the capability to apply uniform, high magnetic fields (10-30 T) energy density experiments on Z facility. This system uses an 8-mF, 15-kV capacitor bank drive large-bore (5 cm diameter), high-inductance (1-3 mH) multi-turn, multi-layer electromagnets that slowly magnetize conductive targets used over several milliseconds (time peak field of 2-7 ms). was commissioned in February 2013 and been more than 30 up 10 T have produced exciting surprising physics...
Magnetized Liner Inertial Fusion (MagLIF) is a magneto-inertial fusion concept, which presently being studied on the Z Pulsed Power Facility. The concept utilizes an axial magnetic field and laser heating to produce fusion-relevant conditions at stagnation despite peak magnetically driven implosion velocity of less than 100 km/s. Initial experiments demonstrated viability but left open questions about amount energy coupled fuel role that mix played in conditions. In this paper, simple...
Magnetized liner inertial fusion (MagLIF) experiments have demonstrated fusion-relevant ion temperatures up to 3.1 keV and thermonuclear production of 1.1 × 1013 deuterium–deuterium neutrons. This performance was enabled through platform development that provided increases in applied magnetic field, coupled preheat energy, drive current. Advanced coil designs with internal reinforcement an increase from 10 20 T. An improved laser pulse shape, beam smoothing, thinner entrance foils increased...
Magnetized Liner Inertial Fusion experiments performed at Sandia's Z facility have demonstrated significant thermonuclear fusion neutron yields (∼1012 DD neutrons) from multi-keV deuterium plasmas inertially confined by slow (∼10 cm/μs), stable, cylindrical implosions. Effective magnetic confinement of charged reactants and products is signaled high secondary DT above 1010. Analysis extensive power, imaging, spectroscopic x-ray measurements provides a detailed picture ∼3 keV temperatures,...
The Magnetized Liner Inertial Fusion concept (MagLIF) [Slutz et al., Phys. Plasmas 17, 056303 (2010)] is being studied on the Z facility at Sandia National Laboratories. Neutron yields greater than 1012 have been achieved with a drive current in range of 17–18 MA and pure deuterium fuel [Gomez Rev. Lett. 113, 155003 (2014)]. We show that 2D simulated are about twice best obtained likely cause this difference mix material into fuel. Mitigation strategies presented. Previous numerical studies...
Imploding wire arrays on the 20 MA Z generator have recently provided some of most powerful and energetic laboratory sources multi-keV photons, including ∼375 kJ Al K-shell emission (hν ∼ 1–2 keV), ∼80 stainless steel 5–9 keV) a kJ-level Mo 17 keV). While global implosion dynamics these different are very similar, physical process that dominates from x-ray fall into three broad categories. produce column plasma with densities up to ∼3 × 1021 ions/cm3, where opacity inhibits escape photons....
We report on a series of Magnetized Liner Inertial Fusion (MagLIF) experiments conducted the Z pulsed power facility that utilized high aspect ratio (ratio outer radius to wall thickness) liners with dielectric coatings and low-mix laser preheat configurations. The consisted an 10.6 beryllium tube coated 75 μm epoxy outside have been shown maintain better implosion stability than uncoated demonstrated consistent stagnation performances in previous [Ampleford et al., Phys. Plasmas 31, 022703...
Summary form only given. The Defense Advanced Research Projects Agency is investigating electromagnetic (EM) guns for the next generation combat vehicle providing greater range, accuracy, and survivability without use of propellant. Electromagnetic can provide high-fidelity controlled muzzle velocity, which removes largest source error in ballistic terminal phase.
A comprehensive gas puff capability is being developed on the Z pulsed power generator. We describe methodology employed for developing a load Z, which combines characterization and modeling of neutral mass flow from supersonic nozzle, numerical implosion this profile, experimental evaluation these magnetic implosions Z. are beginning multiyear science program to study z-pinch physics at high current, starting with an 8-cm diameter double-shell delivers column Ar that imploded by machine's...
We have developed a physics-based transmission-line-circuit model of the Z pulsed-power accelerator. The 33-m-diameter machine generates peak electrical power as high 85 TW, and delivers much 25 MA to physics load. circuit is used design analyze experiments conducted on Z. consists 36 networks elements resistors that represent each Zs modules. module includes Marx generator, intermediate-energy-storage capacitor, laser-triggered gas switch, pulse-forming line, self-break water switches,...
Sandia's Z Machine uses its high current to magnetically implode targets relevant inertial confinement fusion. Since target performance is highly dependent on the applied drive field, measuring magnetic field at essential for accurate simulations. Recently, was measured through splitting of sodium 3s-3p doublet 5890 and 5896 Å. Spectroscopic dopants were exterior target, spectral lines observed in absorption. Magnetic fields excess 200 T measured, corresponding currents approximately 5 MA...
The MagLIF (Magnetized Liner Inertial Fusion) concept [Slutz et al., Phys. Plasmas 17, 056303 (2010)] has demonstrated fusion-relevant plasma conditions [Gomez Rev. Lett. 113, 155003 (2014)] on the Z accelerator using external field coils to magnetize fuel before compression. We present a novel (AutoMag), which uses composite liner with helical conduction paths separated by insulating material provide magnetization from early part of drive current, design rises slowly enough avoid electrical...
Argon gas puffs have produced 330 kJ ± 9% of x-ray radiation above 3 keV photon energy in fast z-pinch implosions, with remarkably reproducible K-shell spectra and power pulses. This reproducibility production is particularly significant light the variations instability evolution observed between experiments. Soft measurements line ratios from a time-resolved spectrum at peak suggest that plasma gradients these high-mass pinches may limit radiating mass, power, yield high-current puffs.
Magnetized liner inertial fusion (MagLIF) is an attractive concept for producing thermonuclear reactions. The MagLIF platform involves the operation of Helmholtz coils to apply a 15 Tesla axial magnetic field load region, where cylindrical, fuel-filled metal imploded by <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo>∼</a:mo><a:mn>2</a:mn><a:mn>0</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>MA</a:mi></a:mrow></a:math> current pulse. fringe from...