A5080072919- Laser-Plasma Interactions and Diagnostics
- Nuclear Physics and Applications
- Laser-induced spectroscopy and plasma
- Magnetic confinement fusion research
- High-pressure geophysics and materials
- Ion-surface interactions and analysis
- Radiation Detection and Scintillator Technologies
- Solar and Space Plasma Dynamics
- Diamond and Carbon-based Materials Research
- Astro and Planetary Science
- Combustion and Detonation Processes
- Laser Design and Applications
- Atomic and Molecular Physics
- Medical Research and Treatments
- Atomic and Subatomic Physics Research
- Plasma Diagnostics and Applications
- Space Satellite Systems and Control
- Laser-Matter Interactions and Applications
- Fusion materials and technologies
- Geophysics and Gravity Measurements
- High-Energy Particle Collisions Research
- Nanotechnology research and applications
- Fault Detection and Control Systems
- 3D Modeling in Geospatial Applications
- Radiation Therapy and Dosimetry
Plasma Technology (United States)
2021-2025
Fusion Academy
2021-2025
Massachusetts Institute of Technology
2021-2025
Fusion (United States)
2022-2024
IIT@MIT
2022
Franklin W. Olin College of Engineering
2020
Polar-direct-drive implosions at the National Ignition Facility generated large plasma volumes to study 3He + fusion reaction. The ion temperature, which determines Gamow peak energy, was constrained by isolating thermal contribution D3He-proton spectral width in a doped with deuterium. X-ray penumbral imaging used measure electron density, and hotspot volume, subsequently model broadening from stopping power. Results showed 30% of due power, residual flows contributing ≈10%. temperature...
The Particle Time of Flight (PTOF) diagnostic is a chemical vapor deposition diamond-based detector and the only for measuring nuclear bang times low yield (<1013) shots on National Ignition Facility. Recently, comprehensive study impulse responses revealed certain detectors with very fast consistent rise time <50 ps, enabling burn history measurements. At current standoff 50 cm, this measurement possible 14 MeV neutrons from deuterium–tritium (DT) fusion plasmas. PTOF-inferred...
Here, we present a Monte Carlo toolkit for validating step range filter (SRF) spectrometer designs. Geant4 is used to transport charged particles through the SRF filters generate synthetic data that include realistic CR-39 effects. Synthetic spectra generated by this method inherently account instrument response and allow quantification of performance before shots. The usefulness demonstrated its application number problems. A new broadband ∼10 MeV wide 3He3He proton spectrum validated, an...
State of the art experiments show that Biermann-battery magnetic fields in laser-driven plasmas can produce a magnetized collisionless shock precursor, mimicking scenario Venus bow-shock formation.
Energetic charged particles generated by inertial confinement fusion (ICF) implosions encode information about the spatial morphology of hotspot and dense fuel during time peak reactions. The knock-on deuteron imager (KoDI) was developed at Omega Laser Facility to image these in order diagnose low-mode asymmetries layer cryogenic deuterium–tritium ICF implosions. However, images collected are distorted several ways that prevent reconstruction source. In this paper, we describe distortions a...
The next-generation magnetic recoil spectrometer (MRSnext) is being designed to replace the current MRS at National Ignition Facility and OMEGA for measurements of neutron spectrum from an inertial confinement fusion implosion. MRSnext will provide a far-superior performance faster data turnaround than systems, i.e., 2× 6× improvement in energy resolution NIF OMEGA, respectively, 20× time. substantially improved enabled by using electromagnets that short focal plane (12–16 cm) unprecedented...
Knock-on deuteron imaging is a new diagnostic technique that being implemented at the OMEGA laser facility to diagnose morphology of an inertial confinement fusion (ICF) implosion. It utilizes fact some neutrons from deuterium–tritium (DT)-fusion reactions generated in central hot-spot ICF implosion elastically scatter deuterons as they traverse surrounding shell layer. The energy these “knock-on” depends on scattering angle, where most energetic are forward-scattered and probe shape...
Multidimensional effects on hot-spot formation must be considered to better understand the current limits performance of direct-drive inertial confinement fusion experiments OMEGA with cryogenically layered solid deuterium–tritium targets. A comprehensive reconstruction effort has been established at Laboratory for Laser Energetics infer and shell conditions stagnation from a large collection x-ray, neutron, particle detectors along multiple lines sight. Several time-gated time-integrated...
Penumbral imaging is a technique used in plasma diagnostics which radiation source shines through one or more large apertures onto detector. To interpret penumbral image, must reconstruct it to recover the original source. The inferred always has some error due noise image and uncertainty instrument geometry. Interpreting thus requires quantification of that inference’s uncertainty. Markov chain Monte Carlo algorithms have been quantify for similar problems but never inference shape an...
3D asymmetries are major degradation mechanisms in inertial-confinement fusion implosions at the National Ignition Facility (NIF). These can be diagnosed and reconstructed with neutron imaging system (NIS) on three lines of sight around NIF target chamber. Conventional tomographic reconstructions used to reconstruct morphology implosion using NIS [Volegov et al., J. Appl. Phys. 127, 083301 (2020)], but problem is ill-posed only sight. Asymmetries also real-time activation diagnostics (RTNAD)...
Proton radiography is an essential diagnostic for studying magnetic fields in high energy density physics experiments. Protons are born a fusion implosion, traverse the plasma, and detected on CR-39 solid state nuclear track detectors. Here, it shown that there intrinsic non-uniformity ∼15 MeV D3He proton data. The increasing angle between trajectory center of detector results traveling through more stack material. As protons travel material lose energy, spectrum gets wider. at lower end can...
Image plates (IPs), or phosphor storage screens, are a technology employed frequently in inertial confinement fusion (ICF) and high energy density plasma (HEDP) diagnostics because of their sensitivity to many types radiation, including, x rays, protons, alphas, beta particles, neutrons. Prior studies characterizing IPs predicated on the signal level remaining below scanner saturation threshold. Since scanning process removes some from IP via photostimulated luminescence, repeatedly an can...
Image plates (IPs) are a quickly recoverable and reusable radiation detector often used to measure proton x-ray fluence in laser-driven experiments. Recently, IPs have been radiography stack on the OMEGA laser, diagnostic historically implemented with CR-39, or radiochromic film. The this other diagnostics detect charged particles, neutrons, x-rays indiscriminately. using photo-stimulated luminescence (PSL) material, phosphor, which electrons excited metastable states by ionizing radiation....
This paper reports on investigations the impact of higher neutron fluences detection efficiency protons with CR-39, a charged particle track detector. CR-39 is widely used as diagnostic for inertial fusion applications and an integral component numerous diagnostics at OMEGA laser facility National Ignition Facility. As experiments continue to produce yields, existing are impacted by than they were originally designed for. presents data from measuring proton signal pieces different levels...
A new Magnetic Recoil Spectrometer (MRSt) is designed to provide time-resolved measurements of the energy spectrum neutrons emanating from an inertial confinement fusion implosion at National Ignition Facility. At present, time integrated parameters are being measured using existing magnet recoil and neutron time-of-flight spectrometers. The capability high resolution 2 keV extension about 20 ps expected improve our understanding conditions required for successful experiments. layout,...
A system of x-ray imaging spectrometer (XRIS) has been implemented at the OMEGA Laser Facility and is capable spatially spectrally resolving self-emission from 5 to 40 keV. The consists three independent imagers with nearly orthogonal lines sight for 3D reconstructions emission region. distinct advantage XRIS its large dynamic range, which enabled by use tantalum apertures radii ranging 50 μm 1 mm, magnifications 4 35×, image plates any filtration level. In addition, recording 1-100's images...
The time-resolving Magnetic Recoil Spectrometer (MRSt) for the National Ignition Facility (NIF) has been identified by US Diagnostic Working Group as one of transformational diagnostics that will reshape way inertial confinement fusion (ICF) implosions are diagnosed. MRSt measure time-resolved neutron spectrum an implosion, from which ion temperature, areal density, and yield be inferred. Top-level physics requirements were determined based on simulations numerous ICF with varying degrees...
A knock-on deuteron imager (KoDI) has been implemented to measure the fuel and hotspot asymmetry of cryogenic inertial confinement fusion implosions on OMEGA. Energetic neutrons produced by D-T elastically scatter ("knock on") deuterons from layer with a probability that depends ρR. Deuterons above 10 MeV are near-forward scattering, imaging them is equivalent time-integrated neutron hotspot. below 6 combination side scattering ranging in fuel, encode information about spatial distribution...
New designs and a new analysis technique have been developed for an existing compact charged-particle spectrometer on the NIF OMEGA. The extends capabilities of this diagnostic to measure arbitrarily shaped ion spectra down 1 MeV with yields as low 106. Three different are provided optimized measurement DD protons, T3He deuterons, 3He3He protons. highly customizable, generalized framework is optimizing design alternative applications. Additionally, understanding detector’s response...
The time-resolving magnetic recoil spectrometer (MRSt) is a transformative diagnostic that will be used to measure the time-resolved neutron spectrum from an inertial confinement fusion implosion at National Ignition Facility (NIF). It uses CD foil on outside of hohlraum convert neutrons deuterons. An ion-optical system positioned NIF target chamber energy-disperses and focuses forward-scattered A pulse-dilation drift tube (PDDT) subsequently dilates, un-skews, detects signal. While have...
In order to transform the curved surface of earth onto planar a map, some distortion must be introduced. Conventional map projections are defined by mathematical formulas, and thereby limited in their ability control that complexity those formulas. Piecewise based on interpolation unstructured meshes have no such constraints, can therefore create maps better suited many use cases. A method using multi-dimensional optimization optimize is presented here, demonstrated generation several new...
Charged particle spectrometry is a critical diagnostic to study inertial-confinement-fusion plasmas and high energy density plasmas. The OMEGA Laser Facility has two fixed magnetic charged spectrometers (CPSs) measure MeV-ions. In situ calibration of these was carried out using 241Am 226Ra alpha emitters. emission spectrum from the sources measured independently surface-barrier detectors (SBDs). dispersion broadening CPS systems were determined by comparing that SBD. method significantly...
Shock-driven implosions with 100% deuterium (D_{2}) gas fill compared to 50:50 nitrogen-deuterium (N_{2}D_{2}) have been performed at the OMEGA laser facility test impact of added mid-Z on implosion performance. Ion temperature (T_{ion}) as inferred from width measured DD-neutron spectra is seen be 34%±6% higher for N_{2}D_{2} than D_{2}-only case, while yield 7.2±0.5 times fill. The T_{ion} enhancement observed in spite Z, which might expected lead radiative loss, and shock strength versus...
Radiochromic film (RCF) and image plates (IPs) are both commonly used detectors in diagnostics fielded at inertial confinement fusion (ICF) high-energy-density physics (HEDP) research facilities. Due to the intense x-ray background all ICF/HEDP experiments, accurately calibrating optical density of RCF as a function dose, photostimulated luminescence per photon IPs energy, is necessary for interpreting experimental results. Various measurements sensitivity curve different x rays have been...
This letter reports the first complete observation of magnetized collisionless shock precursors formed through compression Biermann-battery magnetic fields in laser produced plasmas. At OMEGA, lasers produce a supersonic CH plasma flow which is with fields. The collides an unmagnetized hydrogen gas jet to create precursor. situation where flowing carries field similar Venusian bow shock. Imaging 2$\omega$ Thomson scattering confirms that interaction and shows density temperature jumps....