Measurement of Magnetic Cavitation Driven by Heat Flow in a Plasma

We describe the direct measurement of expulsion a magnetic field from plasma driven by heat flow. Using laser to column gas within an applied field, we isolate Nernst advection and show how it changes over nanosecond timescale. Reconstruction map proton radiographs demonstrates that is advected flow in advance expansion with velocity ${v}_{N}=(6\ifmmode\pm\else\textpm\fi{}2)\ifmmode\times\else\texttimes\fi{}{10}^{5}\text{ }\text{ }\mathrm{m}/\mathrm{s}$. Kinetic extended magnetohydrodynamic simulations agree well this regime due buildup transport barrier.