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:
- Journal Article: 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. 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},
number = 2,
volume = 25,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2018},
month = {Thu Feb 01 00:00:00 EST 2018}
}
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