AI Article Synopsis
- The study focuses on measuring the energy transfer between ions and electrons in high-energy-density plasmas using low-velocity ions at the OMEGA laser facility.
- The researchers conducted experiments with D^{3}He gas capsules that achieved extreme densities and temperatures through shock-driven implosions.
- Their findings on ion energy loss matched quantum-mechanical predictions, offering new insights for improving models related to alpha heating in fusion, stellar atmospheres, and supernova shocks.
Article Abstract
We report on measurements of the ion-electron energy-transfer cross section utilizing low-velocity ion stopping in high-energy-density plasmas at the OMEGA laser facility. These measurements utilize a technique that leverages the close relationship between low-velocity ion stopping and ion-electron equilibration. Shock-driven implosions of capsules filled with D^{3}He gas doped with a trace amount of argon are used to generate densities and temperatures in ranges from 1×10^{23} to 2×10^{24} cm^{-3} and from 1.4 to 2.5 keV, respectively. The energy loss of 1-MeV DD tritons and 3.7-MeV D^{3}He alphas that have velocities lower than the average velocity of the thermal electrons is measured. The energy loss of these ions is used to determine the ion-electron energy-transfer cross section, which is found to be in excellent agreement with quantum-mechanical calculations in the first Born approximation. This result provides an experimental constraint on ion-electron energy transfer in high-energy-density plasmas, which impacts the modeling of alpha heating in inertial confinement fusion implosions, magnetic-field advection in stellar atmospheres, and energy balance in supernova shocks.
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| http://dx.doi.org/10.1103/PhysRevE.106.L053201 | DOI Listing |
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