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 GO04: ICF: Advanced Drivers
9:30 AM–11:30 AM,
Tuesday, October 18, 2022
Room: Ballroom 111 A
Chair: Raoul Trines, Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot, OX11 0QX, United Kingdom
Abstract: GO04.00010 : A Bayesian approach to inferring neutron spectra from projectile fusion
11:18 AM–11:30 AM
Presenter:
James R Allison
(First Light Fusion Ltd)
Authors:
James R Allison
(First Light Fusion Ltd)
Jonathan Shimwell
(First Light Fusion Ltd)
Rafel Bordas
(First Light Fusion Ltd)
Hugo W Doyle
(First Light Fusion Ltd)
Brian D Appelbe
(Imperial College London)
Guy C Burdiak
(First Light Fusion Ltd)
Nicholas Hawker
(First Light Fusion Ltd)
We modelled the expected neutron arrival times at each detector, from which Poisson likelihood functions were constructed. We accounted for single-neutron coincidence between detector pairs by using a Gaussian copula, with correlation coefficients determined from neutronics simulations. From the joint likelihood function we built a posterior density function for the source parameters, conditioned on the experimental data.
We verified this method using data from the fusion validation campaign (Burdiak et al. 2022), inferring a yield Y = 51+39-21 (95% EQI) and a scattered fraction X = 83+16-25 %. Current yields and detector resolution are not yet sufficient to measure the ion temperature at significance. However, if a suitably large detector array can be designed, we predict that a factor of ten improvement in timing resolution should enable recovery of temperatures at a few keV for yields of a few thousand neutrons using this method.
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