Arran, C. and Bradford, P. and Dearling, A. and Hicks, G. S. and Al-Atabi, S. and Antonelli, L. and Ettlinger, O. C. and Khan, M. and Read, M. P. and Glize, K. and Notley, M. and Walsh, C. A. and Kingham, R. J. and Najmudin, Z. and Ridgers, C. P. and Woolsey, N. C. (2023) Measurement of Magnetic Cavitation Driven by Heat Flow in a Plasma. Physical review letters, 131 (1): 015101. ISSN 0031-9007
Full text not available from this repository.Abstract
We describe the direct measurement of the expulsion of a magnetic field from a plasma driven by heat flow. Using a laser to heat a column of gas within an applied magnetic field, we isolate Nernst advection and show how it changes the field over a nanosecond timescale. Reconstruction of the magnetic field map from proton radiographs demonstrates that the field is advected by heat flow in advance of the plasma expansion with a velocity vN=(6±2)×105 m/s. Kinetic and extended magnetohydrodynamic simulations agree well in this regime due to the buildup of a magnetic transport barrier.