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We have explored the thermodynamics of compressed magnetized plasmas inlaboratory experiments and we call these studies "magnetothermodynamics". Theexperiments are carried out in the Swarthmore Spheromak eXperiment device. Inthis device, a magnetized plasma source is located at one end and at the otherend, a closed conducting can is installed. We generate parcels of magnetizedplasma and observe their compression against the end wall of the conductingcylinder. The plasma parameters such as plasma density, temperature, andmagnetic field are measured during compression using HeNe laser interferometry,ion Doppler spectroscopy and a linear $\dot{B}$ probe array, respectively. Toidentify the instances of ion heating during compression, a PV diagram isconstructed using measured density, temperature, and a proxy for the volume ofthe magnetized plasma. Different equations of state are analyzed to evaluatethe adiabatic nature of the compressed plasma. A 3D resistivemagnetohydrodynamic code (NIMROD) is employed to simulate the twisted Taylorstates and show stagnation against the end wall of the closed conducting can.The simulation results are consistent to what we observe in our experiments.

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