Flux Compression Generator Development at the Air Force Research Laboratory

Cavazos, T.; Gale, D.; Roth, Charles E.; Parker, J.V.; Sommars, W.; Coffey, S.K.; Lehr, F.M.; Tucker, W.; Kiuttu, G.F.; Degnan, J.H.

doi:10.1109/ppc.2005.300686

Cited by 8 publications

(1 citation statement)

References 4 publications

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“…The design objective for JAKE [2] was delivery of a multi-MA current pulse to load inductances of 200 nH to 1000 nH with a current gain of approximately 100. The resulting generator has a stator diameter and length of 260 mm and 790 mm respectively.…”

Section: Introductionmentioning

confidence: 99%

Development and Testing of a High-Gain Magnetic Flux Compression Generator

Parker¹,

Cavazos²,

Roth³

et al. 2006

2006 IEEE International Conference on Magagauss Magnetic Field Generation and Related Topics

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The performance of a high-gain FCG is often limited by internal electrical breakdown caused by the high voltage generated during operation. Modern diagnostic techniques provide the opportunity to diagnose internal breakdowns so that generator designs can be improved. This paper describes the internal breakdowns observed in the JAKE FCG developed at the AFRL during the late 1990's. A revision to the stator winding pattern of the JAKE generator has led to improved control of the internal voltage. Designated JILL, the revised generator has substantially better flux transport efficiency, particularly at higher seed current. The techniques employed to design the new stator winding and the results of development testing are presented. 265 978-1-4244-2062-9/08/$25.00 ©2008 IEEE

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Section: Introductionmentioning

confidence: 99%

Development and Testing of a High-Gain Magnetic Flux Compression Generator

Parker¹,

Cavazos²,

Roth³

et al. 2006

2006 IEEE International Conference on Magagauss Magnetic Field Generation and Related Topics

Self Cite

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Novel switch-type exploding electromagnetic pulse generator

Suo

Qiu

et al. 2010

Proceedings of the 9th International Symposium on Antennas, Propagation and EM Theory

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Recent Advances in Modeling Helical FCGS

Kiuttu¹,

Chase²,

Chato³

2006

2006 IEEE International Conference on Megagauss Magnetic Field Generation and Related Topics

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Helical explosively driven magnetic flux compression generators (FCGs) have been intensively investigated for more than four decades, because of their ability to amplify electrical current and magnetic energy with high gain and relatively small size. Whereas coaxial-geometry FCGs have lent themselves to reasonably accurate modeling, helical FCGs have always been considered "anomalously lossy," with calculated performance invariably exceeding observed performance -often by factors of two or more in peak output current.With the advent of the analytically derived Kiuttu Contact Resistance Model (KCRM), it has become possible to approximately account for the losses in the vicinity of the contact point between armature and stator without resorting to any empirical tuning factors. Such factors have generally been required by other modeling and simulation codes to achieve agreement with experimental data. Since its introduction, the KCRM has been extended to include the region immediately in front of the contact point as well, thus improving its accuracy.Another key element in modeling the performance of helical FCGs is proper accounting of the proximity effect between adjacent turns of the solenoidal stator winding. This effect alters the magnetic field and current density distributions from their isolated, approximately locally uniform distributions, leading to an effective increase in flux diffusion rates. In order to quantitatively assess this effect, we have run a number of twodimensional quasi-magnetostatic simulations for varying stator geometries and extracted simplified approximations that can be used in one-dimensional diffusion calculations.We have also examined the details of the circuit model definition (i.e., flux-based from Faraday's Law, or the diffusion equation, and energy-based from Poynting's Theorem). The Generator Equation, derived from the circuit model, involves lumped-element approximations for resistance and inductance, and we have shown that the combination of inductance and resistance, which yields experimental current and time derivative of current, is not unique, and that each lumped element must be consistently defined.We have incorporated these various models and effects into the CAGEN 1½-D modeling code. As a result, we have been able to accurately calculate the performance of a wide variety of FCGs without using any additional adjustment factors. Representative results, as well as descriptions of the models, will be presented.

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Flux Compression Generator Development at the Air Force Research Laboratory

Cited by 8 publications

References 4 publications

Development and Testing of a High-Gain Magnetic Flux Compression Generator

Development and Testing of a High-Gain Magnetic Flux Compression Generator

Novel switch-type exploding electromagnetic pulse generator

Recent Advances in Modeling Helical FCGS

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