The precision fabrication of non-split-turn, bare wire, constant pitch high explosive flux compression generators for use in internal electric breakdown experiments

Kuklo, R. M.; Ault, Stanley K.; Chase, Jay B.

doi:10.1109/megagauss.2012.6781429

Cited by 2 publications

(2 citation statements)

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“…Because the goal of the project was to compare the computational model against HFCG performance, the generators were to be built with high precision in all physical dimensions. The concentricity of the armature with respect to the stator, and uniformity in the pitch of the stator winding were of particular importance [4]. Fig.…”

Section: Methodsmentioning

confidence: 99%

Predicting the threshold for onset of internal electric breakdown in helical flux compression generators using CAGEN and CALE

Chase¹,

Kiuttu²,

Peterson³

et al. 2012

2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)

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The objective of this work is to provide predictability for the threshold of the onset of internal electrical breakdown for helical magnetic flux compression generators (HFCG) to enable higher performance and higher voltage designs and reduce the cost of relying on empirical design methods. The Care'n LLC has used the code CAGEN [1] in conjunction with CALE [2] to investigate the phenomenon of internal electrical breakdown in these devices. The CAGEN was modified to compute the peak electric field strength between the armature and the stator as well as between adjacent wires of the stator. Shock compressed gas within the HFCG plays an essential role so the 2-D hydro-code CALE was necessary in order to get a full prediction of the thresholds. An overview of the modeling and the comparison of experiment are presented. An issue is the role bifurcations play in the electric field breakdown. A new code BSBIF [3] models some of the effects. In order to confirm the modeling, a set of very special HFCGs were fabricated and then fired by Hyperspectral Sciences, Inc. The fabrication details [4], the experimental set-up, and the measurements [5] were entirely the work of HSI.

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Section: Methodsmentioning

confidence: 99%

Predicting the threshold for onset of internal electric breakdown in helical flux compression generators using CAGEN and CALE

Chase¹,

Kiuttu²,

Peterson³

et al. 2012

2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)

Self Cite

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“…There were four focused on the behavior of the aluminum armatures using hand packed Composition C-4 explosive and three full HFCG shots. There were two sizes of armatures prepared: the large one at 19.02 mm outer radius with a thickness of 2.0955 mm and the smaller one at 12.7 mm with a thickness of 2.0955 mm [4]. Only the small armatures were used in the HFCG shots.…”

Section: Introductionmentioning

confidence: 99%

Experiments with explosive flux compression Generators Confirming the CAGEN-CALE threshold predictions for internal electric breakdown

Ault¹,

Kuklo²,

Chase³

2012

2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)

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A total of seven shots were fired at the HyperSpectral Sciences, Inc. firing site in Cinebar, WA, in support of the program to elucidate the internal electric breakdown phenomena. Three experiments were full-up HFCG shots. All of the HFCG shots broke down, while the last one exhibited the clearest example of "classical" breakdown. The correlation of the computer model threshold calculation with the last shot is quite good. The use of framing and streak cameras as a diagnostic has proved viable; the contact point as well as the breakdown are very visible. It was found that the electrical arcs that result from the breakdowns do not move. They are overrun by the contact point. The compressed gas in the interior of the HFCG must be taken into account. While it seems quite evident that the breaks are from the stator to the armature, our evidence cannot prove the point. Details of the firing arrangements, the data recovery methods, and the results with comparisons to theory [1], [2], and [3] are presented.

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The precision fabrication of non-split-turn, bare wire, constant pitch high explosive flux compression generators for use in internal electric breakdown experiments

Cited by 2 publications

References 1 publication

Predicting the threshold for onset of internal electric breakdown in helical flux compression generators using CAGEN and CALE

Predicting the threshold for onset of internal electric breakdown in helical flux compression generators using CAGEN and CALE

Experiments with explosive flux compression Generators Confirming the CAGEN-CALE threshold predictions for internal electric breakdown

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