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

Abstract

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 4 s–4 p and C IV 3 s–3 p 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.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [1];  [1];  [2];  [2];  [2]
  1. Weizmann Institute of Science, Rehovot (Israel)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Laboratories, Washington, D.C. (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1487429
Report Number(s):
SAND-2018-7099J
Journal ID: ISSN 1070-664X; 665367
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 11; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Biswas, Subir, Johnston, Mark D., Doron, Ramy, Mikitchuk, Ditmitry, Maron, Yitzhak, Patel, Sonal G., Kiefer, Mark L., and Cuneo, Michael E.. Shielding of the azimuthal magnetic field by the anode plasma in a relativistic self-magnetic-pinch diode. United States: N. p., 2018. Web. doi:10.1063/1.5046945.
Biswas, Subir, Johnston, Mark D., Doron, Ramy, Mikitchuk, Ditmitry, Maron, Yitzhak, Patel, Sonal G., Kiefer, Mark L., & Cuneo, Michael E.. Shielding of the azimuthal magnetic field by the anode plasma in a relativistic self-magnetic-pinch diode. United States. doi:10.1063/1.5046945.
Biswas, Subir, Johnston, Mark D., Doron, Ramy, Mikitchuk, Ditmitry, Maron, Yitzhak, Patel, Sonal G., Kiefer, Mark L., and Cuneo, Michael E.. Mon . "Shielding of the azimuthal magnetic field by the anode plasma in a relativistic self-magnetic-pinch diode". United States. doi:10.1063/1.5046945.
@article{osti_1487429,
title = {Shielding of the azimuthal magnetic field by the anode plasma in a relativistic self-magnetic-pinch diode},
author = {Biswas, Subir and Johnston, Mark D. and Doron, Ramy and Mikitchuk, Ditmitry and Maron, Yitzhak and Patel, Sonal G. and Kiefer, Mark L. and Cuneo, Michael E.},
abstractNote = {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.},
doi = {10.1063/1.5046945},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 11,
volume = 25,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 26, 2019
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