Effects of alpha-ion stopping on ignition and ignition criteria in inertial confinement fusion experiments
Name
23ja125_full.pdf
Size
740.35 KB
Format
Adobe PDF
Checksum (MD5)
07e7efa4e85490509cbd6e53bd6a6232
Author(s)
Reichelt, Benjamin L.
Petrasso, Richard D.
Li, Chi-Kang
Date Issued
October 2023
Journal
Physics of Plasmas
Publisher
AIP
Abstract
With the advent of ignited plasmas at the National Ignition Facility (NIF), alpha physics has become a driving factor in theoretical understanding and experimental behavior. In this communication, we explore aspects of direct alpha-ion heating through comparison of the consequences from the one-fluid and two-fluid models in the hydrodynamic approach. We show that the case with all alpha energy deposited in electrons raises the ignition criteria by ~4 keV or ~0.2 g/cm2 in the hotspot relative to the case with all alpha energy deposited in ions. In the case of the recently ignited NIF implosion, 30% of the 3.5 MeV a energy is deposited into the DT fuel ions, for which there is negligible difference between the one-fluid and two-fluid ignition criteria. However, changes in the ion stopping fraction through profile effects and alternate stopping power models could lead to ignition curve shifts of ~1 keV.
Description
Submitted for publication in Physics of Plasmas
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/5.0180544
