Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session YI3: BPP Invited III: Gyrokinetic Modeling, Basic Shocks, EOS, and Laboratory Astrophysics
9:30 AM–12:30 PM,
Friday, November 9, 2018
OCC Room: Oregon Ballroom 204
Chair: Mark Gilmore, University of New Mexico
Abstract ID: BAPS.2018.DPP.YI3.3
Abstract: YI3.00003 : Magnetothermodynamics: An experimental study of the equations of state applicable to a magnetized plasma*
10:30 AM–11:00 AM
Measuring the equations of state of a compressed magnetized plasma is important both for advancing fusion experiments and understanding natural systems such as stellar winds. In this talk, I will present results from our recent experiments on the thermodynamics of compressed magnetized plasmas1,2; we call these studies "magnetothermodynamics". In these experiments, we generate parcels of relaxed, magnetized plasma at one end of the linear SSX device and observe their compression in a closed conducting boundary installed at the other end. Plasma parameters are measured during compression. The instances of ion heating during compression are identified by constructing a PV diagram using measured density, temperature, and volume of the magnetized plasma. Theoretically predicted MHD and double adiabatic (CGL) equations of state are compared to experimental measurements to estimate the adiabatic nature of the compressed plasma. Since our magnetized plasmas relax to an equilibrium described by magnetohydrodynamics3, one might expect their thermodynamics to be governed by the corresponding equation of state. However, we find that the magnetohydrodynamic equation of state is not supported by our data. Our results are more consistent with the parallel CGL equation of state suggesting that our weakly collisional plasmas have most of their proton energy in the parallel direction to the magnetic field.
1Kaur et. al., Phys. Rev. E. 97, 011202 (2018).
2Kaur et. al., J. Plasma. Phys. 84, 905840114 (2018).
3Gray et. al., Phys. Rev. Lett. 110, 085002 (2013).
*Work supported by the DOE ARPA-E ALPHA program.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.YI3.3
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