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Title: (U) Roxane Simulations of Explosively Driven Magnetic Flux Compression Generators

 [1];  [1];  [1]
  1. Los Alamos National Laboratory
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Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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Resource Relation:
Conference: NECDC 2014 Proceedings ; 2014-10-20 - 2014-10-24 ; Los Alamos, New Mexico, United States
Country of Publication:
United States
Mathematics & Computing(97); Plasma Physics & Fusion Technology(70)

Citation Formats

Watt, Robert Gregory, Cochran, Frederick L., and Scannapieco, Anthony J. (U) Roxane Simulations of Explosively Driven Magnetic Flux Compression Generators. United States: N. p., 2015. Web.
Watt, Robert Gregory, Cochran, Frederick L., & Scannapieco, Anthony J. (U) Roxane Simulations of Explosively Driven Magnetic Flux Compression Generators. United States.
Watt, Robert Gregory, Cochran, Frederick L., and Scannapieco, Anthony J. Wed . "(U) Roxane Simulations of Explosively Driven Magnetic Flux Compression Generators". United States. doi:.
title = {(U) Roxane Simulations of Explosively Driven Magnetic Flux Compression Generators},
author = {Watt, Robert Gregory and Cochran, Frederick L. and Scannapieco, Anthony J.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 07 00:00:00 EST 2015},
month = {Wed Jan 07 00:00:00 EST 2015}

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  • There are five widely-used classes of explosive-driven flux compression generators. They are the spiral, coaxial, strip, plate and cylindrical implosion systems. The configurations are described and the characteristics of the various types are compared. There are a number of techniques for sharpening or impedance-matching the output pulse of the generators. The use of switching, fuses and transformers are discussed. Some of the areas of application of the generators are outlined briefly. Much of the recent work at Los Alamos has been directed toward the development of the plate generator. This type consists essentially of a transmission line with explosive slabsmore » on the flat surfaces. These plates may be parallel or at an angle with respect to each other. A plane detonation front in the explosive allows a large area of conductor to be driven simultaneously. As a result, the power and current outputs are very high - many megamperes at the terawatt level. This generator is particularly well suited to driving low impedance plasma devices. The results of the plate generator tests are discussed.« less
  • The numerical method is proposed for the calculation of magnetic flux losses due to the emergence of cutoffs in case the alignment of the armature and stator in helical, explosive-driven, magnetic flux-compression generators is disturbed. Comparison is made of the experimental and theoretical results.
  • Explosively-driven helical flux compression generators are generally of larger inductance and therefore of higher energy gain than most other flux compression generators. On the other hand the operation times (usually 200 to 300 or less) are usually too short to serve as direct power supplies for most rail gun applications. This limitation is circumvented, however, when the generator is used to charge an inductive storage coil, which then serves as the rail-gun energy source. We describe here the results of several recent tests with such systems. Projectile masses have ranged from 0.6 to 1.0 kg; both plasma and solidmore » armature modes have been employed. The flux compression generator and its characteristics are describeed, together with the storage coil, the rail gun, projectiles and diagnostics employed. Particular attention is devoted to minimizing flux losses, for example, in the design of the storage coil input crowbar which is activated after the coil is loaded by the generator.« less
  • Explosive driven flux compression generators (FCG's) are single-shot devices that convert part of the energy of high explosives into electromagnetic energy. Some classes of these generators have served quite well as railgun power sources. In this paper and the following paper we describe strip and helical type FCG's, both of which are in use in the Los Alamos railgun program. Advantages and disadvantages these generators have for railgun power supplies will be discussed, together with experimental results obtained and some of the diagnostics we have found particularly useful.
  • Researchers from LLNL and LANSL initiated a joint railgun research and development program to explore the potential of electromagnetic railguns to accelerate projectiles to hypervelocities. The effort was intended to determine experimentally the limits of railgun operation, to verify calculations of railgun performance, and to establish a data base at megampere currents. The program has led to the selection of a particular magnetic flux compression generator (MFCG) design for a set of initial experiments and to the design of small- and large-square bore railguns to match the expected MFCG power profile. The bore sizes are 12.7 and 50 mm, respectively.more » The design of the railguns and the diagnostic and data reduction techniques, followed by the results of eight experiments with the two railgun types are presented.« less