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.).
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- 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
- DOE Contract Number:
- AC05-00OR22725
- Resource Type:
- Journal Article
- 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. doi: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. Thu .
"Observations of electron heating during 28 GHz microwave power application in proto-MPEX". United States. doi:10.1063/1.5018479.
@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},
issn = {1070-664X},
number = 2,
volume = 25,
place = {United States},
year = {2018},
month = {2}
}
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
- Biewer, T. M.; Meitner, S.; Rapp, J.
- Review of Scientific Instruments, Vol. 87, Issue 11
Transport simulations of linear plasma generators with the B2.5-Eirene and EMC3-Eirene codes
journal, August 2015
- Rapp, J.; Owen, L. W.; Bonnin, X.
- Journal of Nuclear Materials, Vol. 463
The Development of the Material Plasma Exposure Experiment
journal, December 2016
- Rapp, Juergen; Biewer, T. M.; Bigelow, T. S.
- IEEE Transactions on Plasma Science, Vol. 44, Issue 12
Plasma source development for fusion-relevant material testing
journal, May 2017
- Caughman, John B. O.; Goulding, Richard H.; Biewer, Theodore M.
- Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 35, Issue 3
Progress in the Development of a High Power Helicon Plasma Source for the Materials Plasma Exposure Experiment
journal, August 2017
- Goulding, R. H.; Caughman, J. B. O.; Rapp, J.
- Fusion Science and Technology, Vol. 72, Issue 4