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Title: Determining the ion temperature and energy distribution in a lithium-plasma interaction test stand with a retarding field energy analyzer

Abstract

The ThermoElectric-driven Liquid-metal plasma-facing Structures (TELS) experiment at the University of Illinois is a gas-puff driven, theta-pinch plasma source that is used as a test stand for off-normal plasma events incident on materials in the edge and divertor regions of a tokamak. The ion temperatures and resulting energy distributions are crucial for understanding how well a TELS pulse can simulate an extreme event in a larger, magnetic confinement device. A retarding field energy analyzer (RFEA) has been constructed for use with such a transient plasma due to its inexpensive and robust nature. The innovation surrounding the use of a control analyzer in conjunction with an actively sampling analyzer is presented and the conditions of RFEA operation are discussed, with results presented demonstrating successful performance under extreme conditions. Such extreme conditions are defined by heat fluxes on the order of 0.8 GW m-2 and on time scales of nearly 200 μs. Measurements from the RFEA indicate two primary features for a typical TELS discharge, following closely with the pre-ionizing coaxial gun discharge characteristics. For the case using the pre-ionization pulse (PiP) and the theta pinch, the measured ion signal showed an ion temperature of 23.3 ± 6.6 eV for the firstmore » peak and 17.6 ± 1.9 eV for the second peak. For the case using only the PiP, the measured signal showed an ion temperature of 7.9 ± 1.1 eV for the first peak and 6.6 ± 0.8 eV for the second peak. These differences illustrate the effectiveness of the theta pinch for imparting energy on the ions. This information also highlights the importance of TELS as being one of the few linear pulsed plasma sources whereby moderately energetic ions will strike targets without the need for sample biasing.« less

Authors:
 [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]
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  1. Univ. of Illinois at Urbana-Champaign, IL (United States)
Publication Date:
Research Org.:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1535334
Alternate Identifier(s):
OSTI ID: 1373446
Grant/Contract Number:  
FG02-99ER54515; DEFG02-99ER54515
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 88; Journal Issue: 8; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Instruments & Instrumentation; Physics

Citation Formats

Christenson, M., Stemmley, S., Jung, S., Mettler, J., Sang, X., Martin, D., Kalathiparambil, K., and Ruzic, D. N. Determining the ion temperature and energy distribution in a lithium-plasma interaction test stand with a retarding field energy analyzer. United States: N. p., 2017. Web. doi:10.1063/1.4995601.
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Christenson, M., Stemmley, S., Jung, S., Mettler, J., Sang, X., Martin, D., Kalathiparambil, K., & Ruzic, D. N. Determining the ion temperature and energy distribution in a lithium-plasma interaction test stand with a retarding field energy analyzer. United States. https://doi.org/10.1063/1.4995601
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Christenson, M., Stemmley, S., Jung, S., Mettler, J., Sang, X., Martin, D., Kalathiparambil, K., and Ruzic, D. N. Tue . "Determining the ion temperature and energy distribution in a lithium-plasma interaction test stand with a retarding field energy analyzer". United States. https://doi.org/10.1063/1.4995601. https://www.osti.gov/servlets/purl/1535334.
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@article{osti_1535334,
title = {Determining the ion temperature and energy distribution in a lithium-plasma interaction test stand with a retarding field energy analyzer},
author = {Christenson, M. and Stemmley, S. and Jung, S. and Mettler, J. and Sang, X. and Martin, D. and Kalathiparambil, K. and Ruzic, D. N.},
abstractNote = {The ThermoElectric-driven Liquid-metal plasma-facing Structures (TELS) experiment at the University of Illinois is a gas-puff driven, theta-pinch plasma source that is used as a test stand for off-normal plasma events incident on materials in the edge and divertor regions of a tokamak. The ion temperatures and resulting energy distributions are crucial for understanding how well a TELS pulse can simulate an extreme event in a larger, magnetic confinement device. A retarding field energy analyzer (RFEA) has been constructed for use with such a transient plasma due to its inexpensive and robust nature. The innovation surrounding the use of a control analyzer in conjunction with an actively sampling analyzer is presented and the conditions of RFEA operation are discussed, with results presented demonstrating successful performance under extreme conditions. Such extreme conditions are defined by heat fluxes on the order of 0.8 GW m-2 and on time scales of nearly 200 μs. Measurements from the RFEA indicate two primary features for a typical TELS discharge, following closely with the pre-ionizing coaxial gun discharge characteristics. For the case using the pre-ionization pulse (PiP) and the theta pinch, the measured ion signal showed an ion temperature of 23.3 ± 6.6 eV for the first peak and 17.6 ± 1.9 eV for the second peak. For the case using only the PiP, the measured signal showed an ion temperature of 7.9 ± 1.1 eV for the first peak and 6.6 ± 0.8 eV for the second peak. These differences illustrate the effectiveness of the theta pinch for imparting energy on the ions. This information also highlights the importance of TELS as being one of the few linear pulsed plasma sources whereby moderately energetic ions will strike targets without the need for sample biasing.},
doi = {10.1063/1.4995601},
journal = {Review of Scientific Instruments},
number = 8,
volume = 88,
place = {United States},
year = {Tue Aug 01 00:00:00 EDT 2017},
month = {Tue Aug 01 00:00:00 EDT 2017}
}
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https://doi.org/10.1063/1.4995601
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