Inductance Scaling of a Helicoil Using ALEGRA

Report No. ARL-TR-6397
Authors: Robert Doney
Date/Pages: May 2013; 50 pages
Abstract: The inductance scaling of several helicoil configurations are investigated using the March 2011 release of the Sandia magnetohydrodynamics (MHD) code, ALEGRA. A great majority of the effort is spent ensuring proper convergence of relevant variables for an accurate solution, such as mesh size, resolution, grid biasing, and solver tolerance. For these helicoil geometries, steady-state magnetic diffusion time requires several tens of milliseconds, up to two orders of magnitude greater than that required for coaxial conductors. Inductances are shown to scale quadratically with the number of conductor turns. At moderate to large N, results are in agreement with data provided by Bartkowski and Berning as well inductance calculated for a simple solenoid—a function of the number of turns squared. Surprisingly, the gap size between conducting turns had a minor impact on the results.
Distribution: Approved for public release
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Last Update / Reviewed: May 1, 2013