The design and performance of a transportable low-cost instrument for the generation and application of megagauss fields

Portugall, O.; Puhlmann, N.; Müller, Holger; Barczewski, M.; Stolpe, Ines; Thiede, M.; Scholz, H.; Ortenberg, M. von; Herlach, F.

doi:10.1088/0022-3727/30/11/020

Cited by 25 publications

(18 citation statements)

References 10 publications

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“…Therefore, the simplest magnet design that produces a high field is a single-turn coil, driven by a strip-line transmission line, as done by Portugall, [9] and duplicated by Mielke. [10] This design consists of a single copper sheet that is cut as two converging triangles connected by a thin strip.…”

Section: Single-turn Coilsmentioning

confidence: 99%

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Megagauss field generation for high-energy-density plasma science experiments.

Rovang¹,

Struve²,

Porter³

2008

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There is a need to generate magnetic fields both above and below 1 megagauss (100 T) with compact generators for laser-plasma experiments in the Beamlet and Petawatt test chambers for focused research on fundamental properties of high energy density magnetic plasmas. Some of the important topics that could be addressed with such a capability are magnetic field diffusion, particle confinement, plasma instabilities, spectroscopic diagnostic development, material properties, flux compression, and alternate confinement schemes, all of which could directly support experiments on Z. This report summaries a two-month study to develop preliminary designs of magnetic field generators for three design regimes. These are, (1) a design for a relatively low-field (10 to 50 T), compact generator for modest volumes (1 to 10 cm3), (2) a high-field (50 to 200 T) design for smaller volumes (10 to 100 mm3), and (3) an extreme field (greater than 600 T) design that uses flux compression. These designs rely on existing Sandia pulsed-power expertise and equipment, and address issues of magnetic field scaling with capacitor bank design and field inductance, vacuum interface, and trade-offs between inductance and coil designs.4

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Section: Single-turn Coilsmentioning

confidence: 99%

“…One is to use bi-plate transmission lines from the capacitors to the coil and using rail-gap switches. This is the concept of Portugall [9], as shown in fig. 12.…”

Section: Small Volume High Fieldmentioning

confidence: 99%

Megagauss field generation for high-energy-density plasma science experiments.

Rovang¹,

Struve²,

Porter³

2008

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“…Single-turn coil (STC) technique is a convenient method to generate ultrahigh magnetic fields in a semidestructive way. The development of this technique dates back more than 60 years [11][12][13][14][15][16] and was initiated at ISSP in the 1980s [17][18][19][20][21] . As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Higher magnetic-field generation by a mass-loaded single-turn coil

Gen,

Ikeda,

Kawachi

et al. 2021

Preprint

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Single-turn coil (STC) technique is a convenient way to generate ultrahigh magnetic fields of more than 100 T. During the field generation, the STC explosively destructs outward due to the Maxwell stress and Joule heating. Unfortunately, the STC does not work at its full potential because it has already expanded when the maximum magnetic field is reached. Here, we propose an easy way to delay the expansion and increase the maximum field by using a mass-loaded STC. By loading clay on the STC, the field profile drastically changes, and the maximum field increases by 4 %. This method offers an access to higher magnetic fields for physical property measurements.

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“…However, in the laser-plasma context, there is growing interest in scenarios where laserplasma interactions have the potential to self-generate strong magnetic fields or to amplify weak applied magnetic fields [7][8][9][10][11][12]. Such an objective is desirable to augment experimentally available magnetic fields from laser-driven coil [13][14][15][16] or pulsed power sources [17][18][19] and push the study of magnetized high energy density physics into new regimes. Most of the previous work has relied on instability-seeded growth [1,12], flux compression [11], or circularly polarized or Laguerre-Gaussian [7,20] laser pulses, which limits these laser-driven magnetic field generation techniques to specific experimental facilities.…”

Section: Introductionmentioning

confidence: 99%

Strong surface magnetic field generation in relativistic short pulse laser-plasma interaction with an applied seed magnetic field

Weichman,

Robinson,

Murakami

et al. 2020

Preprint

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While plasma often behaves diamagnetically, we demonstrate that the laser irradiation of a thin opaque target with an embedded target-transverse seed magnetic field B seed can trigger the generation of an order-of-magnitude stronger magnetic field with opposite sign at the target surface. Strong surface field generation occurs when the laser pulse is relativistically intense and results from the currents associated with the cyclotron rotation of laser-heated electrons transiting through the target and the compensating current of cold electrons. We derive a predictive scaling for this surface field generation, B gen ∼ −2πB seed ∆x/λ 0 , where ∆x is the target thickness and λ 0 is the laser wavelength, and conduct 1D and 2D particle-in-cell simulations to confirm its applicability over a wide range of conditions. We additionally demonstrate that both the seed and surface-generated magnetic fields can have a strong impact on application-relevant plasma dynamics, for example substantially altering the overall expansion and ion acceleration from a µm-thick laser-irradiated target with a kilotesla-level seed magnetic field.

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The design and performance of a transportable low-cost instrument for the generation and application of megagauss fields

Cited by 25 publications

References 10 publications

Megagauss field generation for high-energy-density plasma science experiments.

Megagauss field generation for high-energy-density plasma science experiments.

Higher magnetic-field generation by a mass-loaded single-turn coil

Strong surface magnetic field generation in relativistic short pulse laser-plasma interaction with an applied seed magnetic field

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