Authors: Yuanjie Huang
In this work, we investigate magnetic flux compression (MFC) process theoretically by means of Maxwell equations. On contrary to previous theoretical studies, the MFC process is found to be not described by magnetic diffusion equations. Also interestingly, it is revealed that a key dimensionless parameter named as magnetic Reynolds number (MRN) may determine the whole MFC process and dominate eddy electric field distribution within liner, temperature rise of liner, the increase of magnetic field enclosed by a liner and so on. At end of MFC, a larger MRN will bring a more obvious temperature rise and may cause a more rapid ablation for liner, which reversely inhibits increase of enclosed magnetic field. To reach the largest magnetic field, the MRN takes neither ultra-large nor quite small values, and a good strategy is that it may be designed to be ~100. On the other hand, a notable Hall electrical voltage exists at the liner, chamber and sample, and it can reach thousands of voltage at end of MFC, and thereby pointing out that the normal resistance detection method may not be suitable for measuring the sample resistance. Considering serious ablation of chamber and noticeable penetration of field into sample, a new detection method for probing insulator-metal transition of sample under isentropic compression was proposed, i.e., measuring temperature rise of sample in terms of instantaneous multi-channel spectrum radiation method. These theoretical analysis on MFC may assist people to understand the physical processes and improve related experimental designs.
Comments: 41 Pages.
[v1] 2019-10-20 06:44:35
Unique-IP document downloads: 11 times
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