Magnetothermodynamics: measurements of the thermodynamic properties in a relaxed magnetohydrodynamic plasma

Kaur, M.; Barbano, L. J.; Suen-Lewis, E. M.; Shrock, J. E.; Light, A. D.; Schaffner, D. A.; Brown, M. B.; Woodruff, S.; Meyer, T.

doi:10.1017/S0022377818000156

Title: Magnetothermodynamics: measurements of the thermodynamic properties in a relaxed magnetohydrodynamic plasma

Journal Article · Mon Feb 19 00:00:00 EST 2018 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/S0022377818000156· OSTI ID:1544324

Kaur, M. ^[1]; Barbano, L. J. ^[1]; Suen-Lewis, E. M. ^[1]; Shrock, J. E. ^[1]; Light, A. D. ^[1]; Schaffner, D. A. ^[2]; Brown, M. B. ^[1]; Woodruff, S. ^[3]; Meyer, T. ^[3]

Swarthmore College, PA (United States)
Bryn Mawr College, PA (United States)
Woodruff Scientific Inc., Seattle, WA (United States)

We have investigated the thermodynamics of compressed magnetized plasmas in laboratory experiments and we call these studies ‘magnetothermodynamics’. The experiments are carried out in the Swarthmore Spheromak eXperiment device. Here, a magnetized plasma source is located at one end and at the other end, a closed conducting can is installed. We generate parcels of magnetized plasma and observe their compression against the end wall of the conducting cylinder. The plasma parameters such as plasma density, temperature and magnetic field are measured during compression using HeNe laser interferometry, ion Doppler spectroscopy and a linear$${\dot{B}}$$probe array, respectively. To identify the instances of ion heating during compression, a PV diagram is constructed using measured density, temperature and a proxy for the volume of the magnetized plasma. Different equations of state are analysed to evaluate the adiabatic nature of the compressed plasma. A three-dimensional resistive magnetohydrodynamic code (NIMROD) is employed to simulate the twisted Taylor states and shows stagnation against the end wall of the closed conducting can. The simulation findings are consistent to what we observe in our experiments.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC)

OSTI ID:: 1544324

Journal Information:: Journal of Plasma Physics, Vol. 84, Issue 1; ISSN 0022-3778

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Propagation of a nonlinear wave packet driven in a relaxed magnetohydrodynamic plasma Kaur, M.; Brown, M. R. Journal of Plasma Physics, Vol. 84, Issue 6 https://doi.org/10.1017/s0022377818001265	journal	December 2018
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Understanding the working of a B-dot probe Bose, Sayak; Kaur, Manjit; Barada, Kshitish K. European Journal of Physics, Vol. 40, Issue 1 https://doi.org/10.1088/1361-6404/aaee31	journal	November 2018
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