Comment on 鈥淢atter-wave interferometry with helium atoms in low-l Rydberg states鈥
Physical Review A American Physical Society (APS) 109:1 (2024) 017301
Control of autoresonant plasma beat-wave wakefield excitation
Physical Review Research 6:1 (2024)
Abstract:
Autoresonant phase locking of the plasma wakefield to the beat frequency of two driving lasers offers advantages over conventional wakefield acceleration methods, since it requires less demanding laser parameters and is robust to variations in the target plasma density. Here, we investigate the kinetic and nonlinear processes that come into play during autoresonant plasma beat-wave acceleration of electrons, their impact on the field amplitude of the accelerating structure, and on acceleration efficiency. Particle-in-cell simulations show that the process depends on the plasma density in a nontrivial way but can be reliably modeled under specific conditions. Beside recovering previous fluid results in the deeply underdense plasma limit, we demonstrate that robust field excitation can be achieved within a fully kinetic self-consistent modeling. By adjusting the laser properties, we can amplify the electric field to the desired level, up to wave breaking, and efficiently accelerate particles; we provide suggestions for optimized laser and plasma parameters. This versatile and efficient acceleration scheme, producing electrons from tens to hundreds of MeV energies, holds promise for a wide range of applications in research industry and medicine.The Epigraphic Habit in a Pompeian House: Rules of Good Manners
Chapter in Brill Studies in Greek and Roman Epigraphy, 20 (2024) 307-320
Phase transitions of Fe2O3 under laser shock compression
under review for Physical Review Letters
Abstract:
We present in-situ x-ray diffraction and velocity measurements of Fe2O3 under laser shock compression at pressures between 38-116 GPa. None of the phases reported by static compression studies were observed. Instead, we observed an isostructural phase transition from 伪-Fe2O3 to a new 伪鈥-Fe2O3 phase at a pressure of 50-62 GPa. The 伪鈥-Fe2O3 phase differs from 伪-Fe2O3 by an 11% volume drop and a different unit cell compressibility. We further observed a two-wave structure in the velocity profile, which can be related to an intermediate regime where both 伪 and 伪鈥 phases coexist. Density functional theory calculations with a Hubbard parameter indicate that the observed unit cell volume drop can be associated with a spin transition following a magnetic collapse.
Proton imaging of high-energy-density laboratory plasmas
Reviews of Modern Physics American Physical Society 95:4 (2023) 045007