Demonstration of fast-electron populations in a low-pressure, low-power, magnetized RF plasma source
Abstract
Using x-ray spectroscopy, we demonstrate the existence of 0.3–6 keV electrons in a low-pressure, low-power, magnetized plasma source, heated by an external radio-frequency antenna located at one end of an axisymmetric tandem mirror. X-ray measurements on low-bulk-temperature, Te,b ~ 4 eV, hydrogen, neon, argon, and gas-mixture plasmas show spectra with high-energy tails having a near-Maxwellian form with Te,f up to 650 eV. Furthermore, the fast electrons producing these x-rays have densities in the range of 107–109 cm–3 0.01%–1% of the bulk plasma density (up to 3 × 1011 cm–3), and so carry a significant fraction of the plasma energy and represent an important mechanism relevant to power coupling and heat flow in similar plasma sources.
- Authors:
-
[1];
[1];
[2];
[1]
- Princeton Univ., Princeton, NJ (United States). Princeton Plasma Physics Lab.
- Brown Univ., Providence, RI (United States)
- Princeton Univ., Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1460986
- Alternate Identifier(s):
- OSTI ID: 1429954
- Grant/Contract Number:
- AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 3; 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
Jandovitz, P., Swanson, C., Matteucci, J., Oliver, R., Pearcy, J., and Cohen, S. A. Demonstration of fast-electron populations in a low-pressure, low-power, magnetized RF plasma source. United States: N. p., 2018.
Web. doi:10.1063/1.4998735.
Jandovitz, P., Swanson, C., Matteucci, J., Oliver, R., Pearcy, J., & Cohen, S. A. Demonstration of fast-electron populations in a low-pressure, low-power, magnetized RF plasma source. United States. https://doi.org/10.1063/1.4998735
Jandovitz, P., Swanson, C., Matteucci, J., Oliver, R., Pearcy, J., and Cohen, S. A. Tue .
"Demonstration of fast-electron populations in a low-pressure, low-power, magnetized RF plasma source". United States. https://doi.org/10.1063/1.4998735. https://www.osti.gov/servlets/purl/1460986.
@article{osti_1460986,
title = {Demonstration of fast-electron populations in a low-pressure, low-power, magnetized RF plasma source},
author = {Jandovitz, P. and Swanson, C. and Matteucci, J. and Oliver, R. and Pearcy, J. and Cohen, S. A.},
abstractNote = {Using x-ray spectroscopy, we demonstrate the existence of 0.3–6 keV electrons in a low-pressure, low-power, magnetized plasma source, heated by an external radio-frequency antenna located at one end of an axisymmetric tandem mirror. X-ray measurements on low-bulk-temperature, Te,b ~ 4 eV, hydrogen, neon, argon, and gas-mixture plasmas show spectra with high-energy tails having a near-Maxwellian form with Te,f up to 650 eV. Furthermore, the fast electrons producing these x-rays have densities in the range of 107–109 cm–3 0.01%–1% of the bulk plasma density (up to 3 × 1011 cm–3), and so carry a significant fraction of the plasma energy and represent an important mechanism relevant to power coupling and heat flow in similar plasma sources.},
doi = {10.1063/1.4998735},
journal = {Physics of Plasmas},
number = 3,
volume = 25,
place = {United States},
year = {Tue Mar 27 00:00:00 EDT 2018},
month = {Tue Mar 27 00:00:00 EDT 2018}
}
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Figures / Tables:
FIG. 1. : a) Schematic of the experiment. b) Typical on-axis axial field magnitude versus z. c) Source region with doublesaddle antenna.
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Works referencing / citing this record:
Spontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machine
journal, June 2019
- Swanson, C.; Cohen, S. A.
- Physics of Plasmas, Vol. 26, Issue 6
Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.