S. H. Batha
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View article: Laser-driven flash x-ray radiography of a shocked metallic foil
Laser-driven flash x-ray radiography of a shocked metallic foil Open
Characterizing hydrodynamic instability evolution in millimeter-scale, high-Z foils is crucial for understanding complex phenomena in high-energy-density physics. Here, we demonstrate a proof-of-concept, laser-driven flash x-ray radiograph…
View article: Characterization of laser-accelerated proton beams from a 0.5 kJ sub-picosecond laser for radiography applications
Characterization of laser-accelerated proton beams from a 0.5 kJ sub-picosecond laser for radiography applications Open
Laser-accelerated ion beams show promise for many applications, including high-resolution flash imaging of static or dynamic objects in next-generation radiography to probe materials and plasmas in extreme environments and inertial confine…
View article: Reaction-in-flight neutrons as a diagnostic for hydrodynamical mixing in double shell inertial confinement fusion capsules
Reaction-in-flight neutrons as a diagnostic for hydrodynamical mixing in double shell inertial confinement fusion capsules Open
We examine reaction-in-flight (RIF) neutrons as diagnostics for hydrodynamical mixing of high-Z shell material into the hotspot of double shell capsules that are designed for the National Ignition Facility. In particular, we consider the e…
View article: Relative sensitivity of plastic scintillator: A comparative analysis with 60Co gamma rays, deuterium–deuterium, and deuterium–tritium neutrons
Relative sensitivity of plastic scintillator: A comparative analysis with 60Co gamma rays, deuterium–deuterium, and deuterium–tritium neutrons Open
A plastic scintillator has found extensive application in the realm of high-energy physics and national security science. Many applications in those fields often involve the simultaneous production of photons, neutrons, and charged particl…
View article: Multi-Probe Radiography: For 2035 and Beyond
Multi-Probe Radiography: For 2035 and Beyond Open
The Multi-Probe Radiography Project is investigating the use of multiple species of probe beams to provide more information from a radiography. Contextual radiographic, source, and measurements information is being provided through a serie…
View article: Machine learning based unfolding of x-ray spectra from filter stack spectrometer data
Machine learning based unfolding of x-ray spectra from filter stack spectrometer data Open
We demonstrate the application of neural networks to perform x-ray spectra unfolding from data collected by filter stack spectrometers. A filter stack spectrometer consists of a series of filter-detector pairs, where the detectors behind e…
View article: Reduced-order model to approximate response matrices for filter stack spectrometers
Reduced-order model to approximate response matrices for filter stack spectrometers Open
We present a reduced-order model to calculate response matrices rapidly for filter stack spectrometers (FSSs). The reduced-order model allows response matrices to be built modularly from a set of pre-computed photon and electron transport …
View article: The crucial role of diagnostics in achieving ignition on the National Ignition Facility (NIF)
The crucial role of diagnostics in achieving ignition on the National Ignition Facility (NIF) Open
Well over 100 diagnostics can operate on the National Ignition Facility (NIF) as a result of several decades of development on NIF, and before that on Nova, OMEGA, and earlier LLNL lasers. A subset of these have guided the approach to achi…
View article: A modular, high dynamic range passive neutron dosimeter and imaging diagnostic
A modular, high dynamic range passive neutron dosimeter and imaging diagnostic Open
The multi-decade neutron dosimeter and imaging diagnostic (MDND) is a passive diagnostic that utilizes the polyethylene (n, p) nuclear reaction to enhance the diagnostic’s sensitivity for time and energy integrated neutron measurements in …
View article: Multi-Probe 24A: Post shot Data and Analysis
Multi-Probe 24A: Post shot Data and Analysis Open
The Multi-Probe 24A experiments took place on the Omega EP laser in November 2023. The experiments consisted of shots alternating between Omega EP’s two short-pulse laser beams to generate proton and deuteron ion beams from a range of film…
View article: Multi-Probe FY25 Omega EP Shot Request [Slides]
Multi-Probe FY25 Omega EP Shot Request [Slides] Open
The goal of the Multi-Probe experimental campaign is to assess the feasibility of using multiple probe types (x ray, proton, neutron, and electron) in future LANL radiographic facilities. X-ray and proton platforms have been demonstrated. …
View article: Modeling gated neutron images of THD capsules
Modeling gated neutron images of THD capsules Open
Time gating a neutron detector 28m from a NIF implosion can produce images at different energies. The brighter image near 14 MeV reflects the size and symmetry of the capsule 'hot spot'. Scattered neutrons, {approx}9.5-13 MeV, reflect the …
View article: Diagnosing ICF gamma-ray physics
Diagnosing ICF gamma-ray physics Open
Gamma rays produced in an ICF environment open up a host of physics opportunities we are just beginning to explore. A branch of the DT fusion reaction, with a branching ratio on the order of 2e-5 {gamma}/n, produces 16.7 MeV {gamma}-rays. …
View article: Achievement of Target Gain Larger than Unity in an Inertial Fusion Experiment
Achievement of Target Gain Larger than Unity in an Inertial Fusion Experiment Open
On December 5, 2022, an indirect drive fusion implosion on the National Ignition Facility (NIF) achieved a target gain Gtarget of 1.5. This is the first laboratory demonstration of exceeding “scientific breakeven” (or Gtarget>1) where 2.05…
View article: Calculations of double cylinder implosions at OMEGA
Calculations of double cylinder implosions at OMEGA Open
Foam-filled double cylinder targets have been imploded by the OMEGA laser at the University of Rochester. A marker layer of heavier material is placed between the foam and the outside ablator. The marker layer is hydrodynamically unstable …
View article: Robust unfolding of MeV x-ray spectra from filter stack spectrometer data
Robust unfolding of MeV x-ray spectra from filter stack spectrometer data Open
We present an inversion method capable of robustly unfolding MeV x-ray spectra from filter stack spectrometer (FSS) data without requiring an a priori specification of a spectral shape or arbitrary termination of the algorithm. Our inversi…
View article: Diagnostics for Short-Pulse Radiography
Diagnostics for Short-Pulse Radiography Open
The Multi-Probe project is developing radiographic techniques using probe beams generated by short-pulse lasers. Shortcomings in present detectors and future capabilities in new devices are described.
View article: Introduction to the special topic on inertial confinement fusion diagnostics
Introduction to the special topic on inertial confinement fusion diagnostics Open
In the first decade of the 21st century, the United States began operating three leading Inertial Confinement Fusion (ICF) and High-Energy Density Physics (HEDP) facilities. The National Ignition Facility (NIF) began its quest to first sur…
View article: Multi-Probe 24A Pre-Shot report
Multi-Probe 24A Pre-Shot report Open
The Multi-Probe Radiography campaign will field a full day of experiments at the Omega EP laser facility. The day consists of shots alternating between Omega EP’s two short-pulse laser beams. The Backlighter beam will generate proton and d…
View article: Diagnosing an IFE Power Plant
Diagnosing an IFE Power Plant Open
This white paper for the Basic Research Needs for Plasma Diagnostics workshop lists a selected set of measurements required for normal and off-normal operation of an Inertial Fusion Energy power plant. An Inertial Fusion Energy (IFE) power…