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Title: Observations of electron heating during 28 GHz microwave power application in proto-MPEX

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:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [1] ; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
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)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
Proto-MPEX Team
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1429196
Alternate Identifier(s):
OSTI ID: 1421892

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., 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. 2018. "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 = {2018},
month = {2}
}