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 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.
- Authors:
-
[1];
[2];
- Weizmann Institute of Science, Rehovot (Israel)
- 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:
- 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. https://doi.org/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. https://doi.org/10.1063/1.5046945. https://www.osti.gov/servlets/purl/1487429.
@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},
number = 11,
volume = 25,
place = {United States},
year = {Mon Nov 26 00:00:00 EST 2018},
month = {Mon Nov 26 00:00:00 EST 2018}
}
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