Design, construction and testing of explosive-driven helical generators

Novac, B.M.; Smith, I.R.; Stewardson, H.R.; Senior, P.; Vadher, V.V.; Enache, M.C.

doi:10.1088/0022-3727/28/4/027

Cited by 31 publications

(4 citation statements)

References 2 publications

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“…12 The time varying resistance R g (t) in this model only represents the dc resistance, which is calculated by the image-current model demonstrated in Ref. 13. The flux conservation coefficients can be determined by comparing the calculation results with the experimental data of similar generators or prototype of the generator to predict.…”

Section: Resistance Calculationmentioning

confidence: 99%

Fast modeling of flux trapping cascaded explosively driven magnetic flux compression generators

Wang

Zhang

Chen

et al. 2013

Review of Scientific Instruments

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To predict the performance of flux trapping cascaded flux compression generators, a calculation model based on an equivalent circuit is investigated. The system circuit is analyzed according to its operation characteristics in different steps. Flux conservation coefficients are added to the driving terms of circuit differential equations to account for intrinsic flux losses. To calculate the currents in the circuit by solving the circuit equations, a simple zero-dimensional model is used to calculate the time-varying inductance and dc resistance of the generator. Then a fast computer code is programmed based on this calculation model. As an example, a two-staged flux trapping generator is simulated by using this computer code. Good agreements are achieved by comparing the simulation results with the measurements. Furthermore, it is obvious that this fast calculation model can be easily applied to predict performances of other flux trapping cascaded flux compression generators with complex structures such as conical stator or conical armature sections and so on for design purpose.

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Section: Resistance Calculationmentioning

confidence: 99%

Fast modeling of flux trapping cascaded explosively driven magnetic flux compression generators

Wang

Zhang

Chen

et al. 2013

Review of Scientific Instruments

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“…Although the calculation methods in [7] were designed for DS-FCGs, the authors here found them to be adaptable for use in the calculation of FT-FCG inductances. Calculations for the resistance curves are carried out with an image-current model based on techniques found in [8].…”

Section: Calculation Of Inductance and Resistance Curvesmentioning

confidence: 99%

“…The time-varying resistance curves were calculated using image-current models found in [8] and [10]. Typically, complex profiles for FCG resistances are desired because they account for a large portion of flux loss seen in FCG experiments.…”

Section: B Time-varying Resistancementioning

confidence: 99%

Modeling and Simulation of Simple Flux-Trapping FCGs Utilizing PSpice Software

Young

Neuber

Kristiansen

2010

IEEE Trans. Plasma Sci.

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A novel modeling and simulation method for fluxtrapping flux-compression generators (FT-FCGs) is presented, which utilizes PSpice circuit-simulation software to solve complex differential equations derived from circuit analysis. The primary motivation for the model development is the desire for a technique to rapidly design and prototype FT-FCGs for use as drivers in high-power microwave sources. The derivation of FT-FCG equations will be given, both in the ideal (lossless) and nonideal cases. For the nonideal case, three flux conservation coefficients are added to the equations to account for intrinsic flux loss in the circuit. Time-varying inductance curves are calculated using zero-dimensional models found in literature and adapted to fit this model. A simple FT-FCG design is used as an example to show the steps taken to complete a simulation. The same design was also fabricated and tested for comparison with predicted results from the model. A comparison of the waveforms acquired through simulation and experiment was found to result in good agreement for a given set of values for the flux conservation coefficients. A discussion of the derived equations, both lossless and nonideal, is given, as well as a discussion on the investigation of the impact of the three flux constants on the circuit. Analysis is offered on the results of this investigation, and conclusions are given on the effectiveness of this model to predict FT-FCG behavior.

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“…More recently developed generators have been described at the megagauss conferences, with energies up to 90 MJ and fuse-type opening switches to increase the output voltage and to shorten the rise time. An overview over design problems and performance calculations is contained in the recent paper by Novac et al [128]; this describes a helical generator built with fairly simple resources at a university laboratory.…”

Section: Flux Compression Systems With An External Loadmentioning

confidence: 99%

Pulsed magnets

Herlach¹

1999

Rep. Prog. Phys.

110

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Pulsed magnets are divided into two categories: below 100 T with pulse duration in the range 1 ms-1 s, and above 100 T with pulse duration of order microsecond due to self-destruction of the coil. For both categories, simple scaling laws for the performance are given. For nondestructive magnets, these depend in the first place on the mechanical strength and electrical conductivity of the materials used in coil design; another important parameter is the size of the bore. Together with the energy and power available from the pulsed power supply, this determines peak field and pulse duration. Different types of power supply are discussed, capacitor banks as well as controlled rectification of ac power. For destructive magnets, there is a simple relation between the peak field and the velocity at which the coil structure is expanded by the magnetic force; this can be estimated from shock wave properties of the conductor. The expansion can be neutralized by imploding the coil in a flux compression experiment. High explosives as well as electromagnetic forces have been used for this purpose to obtain fields up to 2800 T. A simple and efficient method is the exploding single-turn coil; this is best suited for experiments up to 300 T.The design and performance of the different magnets is discussed in detail. A few examples for application of these magnets in experiments are given. Prospects for generating higher fields by different methods are discussed, in particular miniaturization on all levels-coils ('micro-magnets') as well as experiments.

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Design, construction and testing of explosive-driven helical generators

Cited by 31 publications

References 2 publications

Fast modeling of flux trapping cascaded explosively driven magnetic flux compression generators

Fast modeling of flux trapping cascaded explosively driven magnetic flux compression generators

Modeling and Simulation of Simple Flux-Trapping FCGs Utilizing PSpice Software

Pulsed magnets

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