Emission and afterglow properties of an expanding RF plasma with nonuniform neutral gas density
Abstract
In this, we describe some notable aspects of the light emission and afterglow properties in pulsed, high-density (1018–1020 m-3) argon inductively coupled discharges initiated following fast gas injection. The plasma was created in a long, narrow discharge tube and then expanded downstream of the radiofrequency (RF) antenna into a large chamber. Fast camera images of the expanding plasma revealed a multi-phase time-dependent emission pattern that did not follow the ion density distribution. Dramatic differences in visible brightness were observed between discharges with and without an externally applied magnetic field. These phenomena were studied by tracking excited state populations using passive emission spectroscopy and are discussed in terms of the distinction between ionizing and recombining phase plasmas. Additionally, a method is presented for inferring the unknown neutral gas pressure in the discharge tube from the time-dependent visible and infrared emission measured by a simple photodiode placed near the antenna. In magnetized discharges created with fast gas injection, the downstream ion density rose by Δni ~ 1018 m-3 in the first ~100 μs after the RF power was turned off. The conditions conducive to this afterglow density rise are investigated in detail, and the effect is tentatively attributed to pooling ionization.
- Authors:
-
[1];
[1]
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Applied Physics and Materials Science Dept.
- Publication Date:
- Research Org.:
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF); Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)
- OSTI Identifier:
- 1467862
- Alternate Identifier(s):
- OSTI ID: 1283418
- Grant/Contract Number:
- FG02-04ER54755; SC0010471; 1059519
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 23; Journal Issue: 8; 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; ionization; antennas; gas discharges; radiofrequency discharges; brightness; plasma ionization; plasma density; cameras; photodiodes; magnetic fields
Citation Formats
Chaplin, Vernon H., and Bellan, Paul M. Emission and afterglow properties of an expanding RF plasma with nonuniform neutral gas density. United States: N. p., 2016.
Web. doi:10.1063/1.4960326.
Chaplin, Vernon H., & Bellan, Paul M. Emission and afterglow properties of an expanding RF plasma with nonuniform neutral gas density. United States. https://doi.org/10.1063/1.4960326
Chaplin, Vernon H., and Bellan, Paul M. Fri .
"Emission and afterglow properties of an expanding RF plasma with nonuniform neutral gas density". United States. https://doi.org/10.1063/1.4960326. https://www.osti.gov/servlets/purl/1467862.
@article{osti_1467862,
title = {Emission and afterglow properties of an expanding RF plasma with nonuniform neutral gas density},
author = {Chaplin, Vernon H. and Bellan, Paul M.},
abstractNote = {In this, we describe some notable aspects of the light emission and afterglow properties in pulsed, high-density (1018–1020 m-3) argon inductively coupled discharges initiated following fast gas injection. The plasma was created in a long, narrow discharge tube and then expanded downstream of the radiofrequency (RF) antenna into a large chamber. Fast camera images of the expanding plasma revealed a multi-phase time-dependent emission pattern that did not follow the ion density distribution. Dramatic differences in visible brightness were observed between discharges with and without an externally applied magnetic field. These phenomena were studied by tracking excited state populations using passive emission spectroscopy and are discussed in terms of the distinction between ionizing and recombining phase plasmas. Additionally, a method is presented for inferring the unknown neutral gas pressure in the discharge tube from the time-dependent visible and infrared emission measured by a simple photodiode placed near the antenna. In magnetized discharges created with fast gas injection, the downstream ion density rose by Δni ~ 1018 m-3 in the first ~100 μs after the RF power was turned off. The conditions conducive to this afterglow density rise are investigated in detail, and the effect is tentatively attributed to pooling ionization.},
doi = {10.1063/1.4960326},
journal = {Physics of Plasmas},
number = 8,
volume = 23,
place = {United States},
year = {Fri Aug 05 00:00:00 EDT 2016},
month = {Fri Aug 05 00:00:00 EDT 2016}
}
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