Shielding of the azimuthal magnetic field by the anode plasma in a relativistic self-magnetic-pinch diode

Biswas, Subir; Johnston, Mark D.; Doron, R.; Mikitchuk, D.; Maron, Y.; Patel, Sonal; Kiefer, Mark L.; Cuneo, M. E.

doi:10.1063/1.5046945

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…This method does not include the effects of magnetic field shielding, which can be substantial, based on the resistivity of the particular plasma in question. 13 Further improvements can also be made to these measurements. For instance, the use of dopants on the anode would isolate the location of these measurements.…”

Section: Discussionmentioning

confidence: 99%

“…Further analysis of the spectroscopic data from this diode has suggested the magnetic field is, in fact, shielded by the dense plasmas present on the anode surface. 13 In this case, the beam current profile cannot be determined without determining the extent of the shielding. As a result, it is not currently possible to determine an upper bound on the current density distribution from the magnetic field.…”

Section: Figmentioning

confidence: 99%

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Zeeman spectroscopy as a method for determining the magnetic field distribution in self-magnetic-pinch diodes (invited)

Patel

Johnston

Webb

et al. 2018

Review of Scientific Instruments

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In the self-magnetic-pinch diode, the electron beam, produced through explosive field emission, focuses on the anode surface due to its own magnetic field. This process results in dense plasma formation on the anode surface, consisting primarily of hydrocarbons. Direct measurements of the beam’s current profile are necessary in order to understand the pinch dynamics and to determine x-ray source sizes, which should be minimized in radiographic applications. In this paper, the analysis of the C IV doublet (580.1 and 581.2 nm) line shapes will be discussed. The technique yields estimates of the electron density and electron temperature profiles, and the method can be highly beneficial in providing the current density distribution in such diodes.

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Section: Discussionmentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

Zeeman spectroscopy as a method for determining the magnetic field distribution in self-magnetic-pinch diodes (invited)

Patel

Johnston

Webb

et al. 2018

Review of Scientific Instruments

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Introduction

Mikitchuk¹

2019

Springer Theses

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Experimental determination of the thermal, turbulent, and rotational ion motion and magnetic field profiles in imploding plasmas

Maron

2020

Physics of Plasmas

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A tutorial is presented on advances in spectroscopic diagnostic methods developed for measuring key plasma properties in pulsed-power systems such as Z-pinches, magnetized-plasma compression devices, ion and electron diodes, and plasma switches. The parameters measured include the true ion temperature in Z-pinch implosions, which led to a discovery that much of the ion kinetic energy at stagnation is stored in hydrodynamic rather than in thermal motion. This observation contributed a new important insight into the understanding of the ion thermalization at stagnation and stimulated further investigations of turbulence at stagnation, discussed here too. The second part of this tutorial is devoted to the development of measurements for magnetic-field distributions in Z-pinches and in other pulsed-power systems, as well as their use in studying the plasma dynamics, resistivity, and pressure and energy balance. The latter study raises intriguing questions on the implosion process. In particular, in Z-pinches, the current during stagnation was found to largely flow at relatively large radii, outside the stagnation region. The magnetic-field measurements also enable investigations into the compression of a pre-magnetized cylindrical plasma that uncover striking phenomena related to the current flow, where the current was found to redistribute toward the outer regions during the implosion. Observation of the rotation of the magnetized plasma is also discussed. Finally, experimental and theoretical investigations of a non-diffusive fast penetration of magnetic field into a low-density plasma, including its effect on the plasma dynamics, are described.

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Shielding of the azimuthal magnetic field by the anode plasma in a relativistic self-magnetic-pinch diode

Cited by 5 publications

References 16 publications

Zeeman spectroscopy as a method for determining the magnetic field distribution in self-magnetic-pinch diodes (invited)

Zeeman spectroscopy as a method for determining the magnetic field distribution in self-magnetic-pinch diodes (invited)

Introduction

Experimental determination of the thermal, turbulent, and rotational ion motion and magnetic field profiles in imploding plasmas

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