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

Biswas, Subir; Johnston, Mark D.; Doron, Ramy; Mikitchuk, Ditmitry; Maron, Yitzhak; Patel, Sonal G.; Kiefer, Mark L.; Cuneo, Michael E.

doi:10.1063/1.5046945

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

Journal Article · Sun Nov 25 23:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5046945· OSTI ID:1487429

^[1]; ^[2]; Doron, Ramy ^[1]; Mikitchuk, Ditmitry ^[1]; Maron, Yitzhak ^[1]; Patel, Sonal G. ^[2]; Kiefer, Mark L. ^[2]; Cuneo, Michael E. ^[2]

Weizmann Institute of Science, Rehovot (Israel)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

In relativistic electron beam diodes, the self-generated magnetic field causes electron-beam focusing at the center of the anode. Generally, plasma is formed all over the anode surface during and after the process of the beam focusing. In this work, we use visible-light Zeeman-effect spectroscopy for the determination of the magnetic field in the anode plasma in the Sandia 10 MV, 200 kA (RITS-6) electron beam diode. The magnetic field is determined from the Zeeman-dominated shapes of the Al III 4s–4p and C IV 3s–3p doublet emissions from various radial positions. Near the anode surface, due to the high plasma density, the spectral line-shapes are Stark-dominated, and only an upper limit of the magnetic field can be determined. The line-shape analysis also yields the plasma density. The data yield quantitatively the magnetic-field shielding in the plasma. In conclusion, the magnetic-field distribution in the plasma is compared to the field-diffusion prediction and found to be consistent with the Spitzer resistivity, estimated using the electron temperature and charge-state distribution determined from line intensity ratios.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Sandia National Laboratories, Washington, D.C. (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1487429

Report Number(s):: SAND--2018-7099J; 665367

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 25; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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