Observations of electron heating during 28 GHz microwave power application in proto-MPEX
Abstract
The Prototype Material Plasma Exposure Experiment at the Oak Ridge National Laboratory utilizes a variety of power systems to generate and deliver a high heat flux plasma onto the surface of material targets. In the experiments described here, a deuterium plasma is produced via a ~100 kW, 13.56 MHz RF helicon source, to which ~20 kW of 28 GHz microwave power is applied. The electron density and temperature profiles are measured using a Thomson scattering (TS) diagnostic, and indicate that the electron density is centrally peaked. In the core of the plasma column, the electron density is higher than the cut-off density (~0.9 × 1019 m-3) for the launched mixture of X- and O-mode electron cyclotron heating waves to propagate. TS measurements indicate electron temperature increases from ~5 eV to ~20 eV during 28 GHz power application when the neutral deuterium pressure is reduced below 0.13 Pa (~1 mTorr.).
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Proto-MPEX Team
- OSTI Identifier:
- 1429196
- Alternate Identifier(s):
- OSTI ID: 1421892
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 2; 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
Biewer, Theodore M., Bigelow, Tim S., Caneses Marin, Juan F., Diem, Stephanie J., Green, David L., Kafle, Nischal, and Rapp, Juergen. Observations of electron heating during 28 GHz microwave power application in proto-MPEX. United States: N. p., 2018.
Web. doi:10.1063/1.5018479.
Biewer, Theodore M., Bigelow, Tim S., Caneses Marin, Juan F., Diem, Stephanie J., Green, David L., Kafle, Nischal, & Rapp, Juergen. Observations of electron heating during 28 GHz microwave power application in proto-MPEX. United States. https://doi.org/10.1063/1.5018479
Biewer, Theodore M., Bigelow, Tim S., Caneses Marin, Juan F., Diem, Stephanie J., Green, David L., Kafle, Nischal, and Rapp, Juergen. Tue .
"Observations of electron heating during 28 GHz microwave power application in proto-MPEX". United States. https://doi.org/10.1063/1.5018479. https://www.osti.gov/servlets/purl/1429196.
@article{osti_1429196,
title = {Observations of electron heating during 28 GHz microwave power application in proto-MPEX},
author = {Biewer, Theodore M. and Bigelow, Tim S. and Caneses Marin, Juan F. and Diem, Stephanie J. and Green, David L. and Kafle, Nischal and Rapp, Juergen},
abstractNote = {The Prototype Material Plasma Exposure Experiment at the Oak Ridge National Laboratory utilizes a variety of power systems to generate and deliver a high heat flux plasma onto the surface of material targets. In the experiments described here, a deuterium plasma is produced via a ~100 kW, 13.56 MHz RF helicon source, to which ~20 kW of 28 GHz microwave power is applied. The electron density and temperature profiles are measured using a Thomson scattering (TS) diagnostic, and indicate that the electron density is centrally peaked. In the core of the plasma column, the electron density is higher than the cut-off density (~0.9 × 1019 m-3) for the launched mixture of X- and O-mode electron cyclotron heating waves to propagate. TS measurements indicate electron temperature increases from ~5 eV to ~20 eV during 28 GHz power application when the neutral deuterium pressure is reduced below 0.13 Pa (~1 mTorr.).},
doi = {10.1063/1.5018479},
journal = {Physics of Plasmas},
number = 2,
volume = 25,
place = {United States},
year = {Tue Feb 20 00:00:00 EST 2018},
month = {Tue Feb 20 00:00:00 EST 2018}
}
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Works referenced in this record:
Developing the science and technology for the Material Plasma Exposure eXperiment
journal, July 2017
- Rapp, J.; Biewer, T. M.; Bigelow, T. S.
- Nuclear Fusion, Vol. 57, Issue 11
First results from the Thomson scattering diagnostic on proto-MPEX
journal, August 2016
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Transport simulations of linear plasma generators with the B2.5-Eirene and EMC3-Eirene codes
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Plasma source development for fusion-relevant material testing
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Works referencing / citing this record:
Differential pumping requirements for the light-ion helicon source and heating systems of Proto-MPEX
journal, August 2018
- Caneses, J. F.; Piotrowicz, P. A.; Biewer, T. M.
- Physics of Plasmas, Vol. 25, Issue 8
An electron Bernstein wave heating scheme for the Proto-MPEX linear device
journal, July 2018
- Diem, S. J.; Green, D. L.; Harvey, R. W.
- Physics of Plasmas, Vol. 25, Issue 7
Radial transport modeling of high density deuterium plasmas in proto-MPEX with the B2.5-Eirene code
journal, April 2019
- Rapp, J.; Owen, L. W.; Canik, J.
- Physics of Plasmas, Vol. 26, Issue 4
Evidence of electron heating at different radial locations on Proto-MPEX
journal, March 2019
- Lau, C.; Caneses, J. F.; Bigelow, T. S.
- Physics of Plasmas, Vol. 26, Issue 3
Utilization of O-X-B mode conversion of 28 GHz microwaves to heat core electrons in the upgraded Proto-MPEX
journal, May 2019
- Biewer, T. M.; Lau, C.; Bigelow, T. S.
- Physics of Plasmas, Vol. 26, Issue 5
Latest Results from Proto-MPEX and the Future Plans for MPEX
journal, June 2019
- Rapp, J.; Lumsdaine, A.; Beers, C. J.
- Fusion Science and Technology, Vol. 75, Issue 7
Results of Ion Cyclotron Heating Experiments on Proto-MPEX Utilizing a Movable Stainless Steel Target
journal, June 2019
- Goulding, R. H.; Piotrowicz, P. A.; Beers, C. J.
- Fusion Science and Technology, Vol. 75, Issue 7