A fast and compact θ-pinch electromagnetic flux-compression generator

Novac, B.M.; Smith, I.R.; Rankin, D.F.; Hubbard, M.

doi:10.1088/0022-3727/37/21/015

Cited by 20 publications

(5 citation statements)

References 16 publications

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“…An equivalent electrical scheme of the overall system is given in Figure 1. The power source is a low inductance 70 kJ/25 kV capacitor bank [1] feeding an EWA through a flat, low inductance transmission line and two 1.2 MA parallel connected closing switches [2]. The EWA consists of 37 parallel connected OFHC 99.99% purity copper wires, 250 µm diameter and 370 mm long and mounted in a flat, plane geometry (Figure 2).…”

Section: A Pulsed Power Supplymentioning

confidence: 99%

A 10-GW Pulsed Power Supply for HPM Sources

Novae

Istenič

Luo³

et al. 2006

IEEE Trans. Plasma Sci.

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A research activity involving the detailed consideration of novel high voltage transformers (HVTs) for pulsed-power applications has recently begun at Loughborough University (LU). Although the main goal is the demonstration of a compact and lightweight unit employing magnetic self insulation under vacuum conditions, the initial stage of the work is directed towards the development of a conventional air-cored HVT as a main component in a compact power supply for HPM sources. In cooperation with the Swedish Defence Research Agency (FOI), the power supply has been tested with a HPM source of the vircator type.

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Section: A Pulsed Power Supplymentioning

confidence: 99%

A 10-GW Pulsed Power Supply for HPM Sources

Novae

Istenič

Luo³

et al. 2006

IEEE Trans. Plasma Sci.

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“…There is still some potential for further development of EMFC including new techniques such as flux compression in a shock wave generated by impact on a metal powder 21 . The single turn is likely to remain the workhorse for experiments; a substantial increase of the peak field is unlikely.…”

Section: Discussionmentioning

confidence: 99%

The Generation and Use of Pulsed Magnetic Fields

Herlach

2006

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

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The generation and use of pulsed magnetic fields are surveyed from the very beginning with the work of P. Kapitza. The survey is focused on fields in the megagauss range, including non-destructive fields above half a megagauss where the development is now aimed at approaching the 100-tesla limit. In the open literature, megagauss fields were first reported from an experiment with a capacitor-driven single turn coil. This was followed by explosive-driven magnetic flux compression that consistently generates the highest fields. Electromagnetic flux compression was developed from a modest beginning into a research instrument. By far the largest part of scientific research in megagauss fields was accomplished with the single turn coil after it had been developed into a reliable and practical research instrument. The potential for future development of the different techniques and of some novel techniques is indicated. SURVEY AND ORDERS OF MAGNITUDEThis is a review on all aspects of generating pulsed magnetic fields. Since the author has participated in the development of most of the different techniques almost from the beginning, the review will reflect his preferences that are characterized by the design of uncomplicated, reliable devices and by a straightforward theoretical treatment that is in balance with experimental uncertainties. Only key references are given, more details and references can be found in a recent review 1 and a series of books 2 , and of course in the proceedings of all megagauss conferences (see table 1 below for topics).The highest steady-state magnetic field available at present is 45 T, generated by a large hybrid magnet. It is unlikely that this will be extended beyond 50 T in the foreseeable future. Pulsed magnets can generate much higher fields at a fraction of the cost. With a view to experiments, a pulsed field is clearly defined by the fact that no adjustments of the experimental apparatus can be made during the pulse -this also applies to the socalled "quasi-stationary" magnets. With the many different pulse shapes that can be generated, the overall pulse duration is only a rough criterion; more specifically the rise time, a flat top or the time the field is above a given percentage of the peak value, and the decay time (or the time constant in case of exponential decay) ought to be quoted. For flux compression experiments, it is the slope of the final steep field increase that counts. An ultra-strong magnetic field is defined by a field strength that inevitably destroys the current-carrying structure needed for its confinement. Considering the mechanical strength of currently available materials, the limit between destructive and nondestructive fields with feasible dimensions is in the vicinity of 100 T, corresponding to a magnetic stress of 4 GPa. The term "semi-destructive" can be applied to the single turn coil technique where the coil is destroyed but the sample and cryogenic equipment survives. Non-destructive magnets are now mostly made according to the Leuven design with opti...

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“…Table 1 presents the system parameters of the low energy (L) and high energy (H) experiments described later. The flux density on the axis of the copper single-turn coil was measured using pick-up probes, having two turns of 50 μm copper wire wound on a 1 mm glass rod [5]. The probes were located in an oil-filled ceramic tube of 2.45 mm outside diameter, located at the centre of the single-turn coil and in direct contact with the aluminum powder.…”

Section: Experimental Assemblymentioning

confidence: 99%

“…For H-type experiments two probes were employed, separated by 1 mm along the glass rod, with the two voltage signals (proportional to dB/dt) having opposed polarities. The output signals were recorded on a 5 GS/s, 500 MHz digital storage oscilloscope together with the electronically integrated signals [5].…”

Section: Experimental Assemblymentioning

confidence: 99%

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Magnetic flux-compression driven by exploding single-turn coils

Novac

Hook

Smith

2010

2010 IEEE International Power Modulator and High Voltage Conference

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A novel hybrid approach to producing ultrahigh magnetic fields has been successfully demonstrated using a 20 kJ capacitor bank. The explosion of a single-turn copper coil at peak field is used to generate shock-waves, which in turn produce in the aluminum powder filling the single-turn coil a circular insulatormetallic transition advancing towards the coil centre and performing magnetic flux-compression. The flux compression almost precisely doubles the initial flux density generated by the coil, so that some of the Joule energy deposited in the coil is re-use during the process as kinetic energy, rather than being lost as in a standard single-turn experiment. Attempts to scale up the basic arrangement to 80 kJ were only partially successful, but it was nevertheless possible to significantly prolong the duration of the megagauss field that was produced. It is believed that a hybrid method using small explosive charges to produce the shock-waves necessary for flux-compression can certainly be used when attempting to produce record magnetic flux densities in indoor experiments, without the need for a large and costly MJ size capacitor bank.

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A fast and compact θ-pinch electromagnetic flux-compression generator

Cited by 20 publications

References 16 publications

A 10-GW Pulsed Power Supply for HPM Sources

A 10-GW Pulsed Power Supply for HPM Sources

The Generation and Use of Pulsed Magnetic Fields

Magnetic flux-compression driven by exploding single-turn coils

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