Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session BO06: High-Z, Multiply Ionized Atomic Physics
9:30 AM–11:54 AM,
Monday, October 17, 2022
Room: Ballroom 111 C
Chair: Mark Zammit, LANL
Abstract: BO06.00004 : Statistical inference of electron-ion collision rates from simulated X-ray Thomson scattering spectra*
10:06 AM–10:18 AM
Presenter:
Thomas Hentschel
(Cornell University)
Authors:
Thomas Hentschel
(Cornell University)
Alina Kononov
(Sandia National Lab)
Andrew D Baczewski
(Sandia National Laboratories)
Stephanie B Hansen
(Sandia National Laboratories)
Electron-ion collisions play an important role in the free electron dynamics in high energy density states, which are often probed with X-ray Thompson scattering (XRTS) diagnostics. The inclusion of dynamic collision rates or frequencies in free electron models goes beyond the typical uniform electron gas approximation and improves the predictions of spectra, or dynamic structure factors (DSFs), from XRTS in warm dense matter (WDM). However, without experimental data or ab initio calculations of collision rates, current collision rate theories applicable to WDM are typically indirectly validated, for example, by finding the collisional model that, when input into a specific free electron DSF model, yields the best fit to experimental DSF data. We illustrate that this inversion process suffers from instabilities, where large variations in collision frequencies can correspond to approximately the same DSF output. By using ideas from statistical inference, we demonstrate how we can extract reliable confidence intervals for collision frequencies from DSF data. Our approach provides the means for direct validation of collisional theories in the WDM regime, and can help guide improvements to these models.
*SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700