Mark Kimmel
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View article: Optical and x-ray characterization of the Daedalus ultrafast x-ray imager
Optical and x-ray characterization of the Daedalus ultrafast x-ray imager Open
The Daedalus ultrafast x-ray imager is the latest generation in Sandia’s hybrid CMOS detector family. With three frames along an identical line of sight, 1 ns minimum integration time, a higher full well than Icarus, and added features, Da…
View article: Demonstration of improved laser preheat with a cryogenically cooled magnetized liner inertial fusion platform
Demonstration of improved laser preheat with a cryogenically cooled magnetized liner inertial fusion platform Open
We report on progress implementing and testing cryogenically cooled platforms for Magnetized Liner Inertial Fusion (MagLIF) experiments. Two cryogenically cooled experimental platforms were developed: an integrated platform fielded on the …
View article: Helium as a Surrogate for Deuterium in LPI Studies
Helium as a Surrogate for Deuterium in LPI Studies Open
Helium or neopentane can be used as surrogate gas fill for deuterium (D2) or deuterium-tritium (DT) in laser-plasma interaction studies. Surrogates are convenient to avoid flammability hazards or the integration of cryogenics in an experim…
View article: A study of sacrificial mirrors for use prior to a laser wakefield accelerator driven by the Z-Petawatt laser
A study of sacrificial mirrors for use prior to a laser wakefield accelerator driven by the Z-Petawatt laser Open
Many experiments at Sandia’s Z Pulsed Power Facility require x-ray backlighting diagnostics to understand experiment performance. Due to limitations in present-day source/detection modalities, most x-ray diagnostics at Z are restricted to …
View article: Z-Petawatt Laser Highlights for FY21
Z-Petawatt Laser Highlights for FY21 Open
We’re happy to report that the full-aperture upgrade project, started in FY18, is now complete and short-pulse target experiments are underway. The table below lists the present performance level of ZPW. Additional laser improvements are i…
View article: Magnetic field effects on laser energy deposition and filamentation in magneto-inertial fusion relevant plasmas
Magnetic field effects on laser energy deposition and filamentation in magneto-inertial fusion relevant plasmas Open
We report on experimental measurements of how an externally imposed magnetic field affects plasma heating by kJ-class, nanosecond laser pulses. The experiments reported here took place in gas cells analogous to magnetized liner inertial fu…
View article: Lasergate: a windowless gas target for enhanced laser preheat in MagLIF.
Lasergate: a windowless gas target for enhanced laser preheat in MagLIF. Open
to achieving fusion; therefore, a windowless target is desired. The Lasergate concept is designed to accomplish this by “cutting” the window and allowing the interior gas pressure to push the window material out of the beam path just befor…
View article: Lasergate: A windowless gas target for enhanced laser preheat in magnetized liner inertial fusion
Lasergate: A windowless gas target for enhanced laser preheat in magnetized liner inertial fusion Open
At the Z Facility at Sandia National Laboratories, the magnetized liner inertial fusion (MagLIF) program aims to study the inertial confinement fusion in deuterium-filled gas cells by implementing a three-step process on the fuel: premagne…
View article: Evaluation of a fiber-coupled x-ray diffraction detector for dynamic compression experiments
Evaluation of a fiber-coupled x-ray diffraction detector for dynamic compression experiments Open
The long-term x-ray diffraction (XRD) detector scheme compatible with Z-containment experiments will involve conversion of the diffracted x-rays to optical light, which will be transported away from the Z-Dynamic Materials Properties (DMP)…
View article: Review of pulsed power-driven high energy density physics research on Z at Sandia
Review of pulsed power-driven high energy density physics research on Z at Sandia Open
Pulsed power accelerators compress electrical energy in space and time to provide versatile experimental platforms for high energy density and inertial confinement fusion science. The 80-TW “Z” pulsed power facility at Sandia National Labo…
View article: Magnetic Field Effects on the Vishniac Overstability in Scaled Radiative Blast Waves
Magnetic Field Effects on the Vishniac Overstability in Scaled Radiative Blast Waves Open
We report experimental results on the stability of a magnetized laser-launched blast wave scaled to simulate a late-stage supernova remnant. We extend previous results to show the effect of a dynamically significant magnetic field on the s…
View article: X-ray characterization of the Icarus ultrafast x-ray imager
X-ray characterization of the Icarus ultrafast x-ray imager Open
Ultrafast x-ray imagers developed at Sandia National Laboratories are a transformative diagnostic tool in inertial confinement fusion and high energy density physics experiments. The nanosecond time scales on which these devices operate ar…
View article: Solid state streak camera prototype performance testing and future upgrades
Solid state streak camera prototype performance testing and future upgrades Open
Streak Cameras are an essential diagnostic tool used in shock physics and high energy density physics experiments. Such experiments require well calibrated temporally resolving diagnostics for studying events that occur on the nanosecond t…
View article: X-Ray Diffraction Measurements on Laser-Compressed Polycrystalline Samples Using a Short-Pulse Laser Generated X-Ray Source
X-Ray Diffraction Measurements on Laser-Compressed Polycrystalline Samples Using a Short-Pulse Laser Generated X-Ray Source Open
Existing models for most materials do not describe phase transformations and associated lattice dy- namics (kinetics) under extreme conditions of pressure and temperature. Dynamic x-ray diffraction (DXRD) allows material investigations in …
View article: Polycapillary x-ray lenses for single-shot, laser-driven powder diffraction
Polycapillary x-ray lenses for single-shot, laser-driven powder diffraction Open
X-ray diffraction measurements to characterize phase transitions of dynamically compressed high-Z matter at Mbar pressures require both sufficient photon energy and fluence to create data with high fidelity in a single shot. Large-scale la…
View article: Minimizing scatter-losses during pre-heat for magneto-inertial fusion targets
Minimizing scatter-losses during pre-heat for magneto-inertial fusion targets Open
The size, temporal and spatial shape, and energy content of a laser pulse for the pre-heat phase of magneto-inertial fusion affect the ability to penetrate the window of the laser-entrance-hole and to heat the fuel behind it. High laser in…