Abstract Details
| status: | file name: | submitted: | by: |
|---|---|---|---|
| approved | sherwood_2017.pdf | 2017-05-30 17:03:44 | Luca Guazzotto |
Abstracts
Author: Luca Guazzotto
Requested Type: Poster
Submitted: 2017-03-17 14:54:23
Co-authors: R. Betti
Contact Info:
Auburn University
206 Allison Lab
Auburn, AL 36849
USA
Abstract Text:
In magnetic confinement nuclear fusion experiments, performance with respect to ignition is expressed in terms of the Lawson criterion [1], a zero-dimensional, single-fluid, steady-state power balance expressing the plasma properties needed for ignition through the energy confinement time τE and the plasma temperature and density. Several improvements to the classical criterion were investigated in recent work [2]. In particular, ions, electrons and α particles are allowed to have different energy confinement times and energy coupling times are expressed through physics-based relations. The effect of multi-fluid physics is examined in a steady-state analysis and for the time-dependent case, which requires a nonlinear treatment more detailed than the standard “T ̇ vs. T” single-fluid one [3]. A one-dimensional analysis is also considered to investigate the importance of density and temperature profiles on the τE needed for ignition. Rather than by solving the 1D transport equations, this is done with a parametric study. This work is now extended to analyze burning plasmas for experimentally relevant conditions. In particular, the threshold plasma conditions that will allow to reach the burning plasma state are found. Those conditions are related to experimental conditions through the introduction of a P_no−alpha parameter, which can be directly measured in experiments. This work was performed under DOE grant DE-FG02-93ER54215.
[1] J. D. Lawson, Proc. Phys. Soc. London Sect. B 70, 6 (1957)
[2] L. Guazzotto and R. Betti, 2016APS.DPPB10069G
[3] J. P. Freidberg, Plasma Physics and Fusion Energy, Cambridge University Press, Cambridge UK, 2007
Comments: