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Title: Integrated plasma facing component calorimetry for measurement of shot integrated deposited energy in the NSTX-U

Abstract

Here, the upgrade to the National Spherical Torus eXperiment (NSTX-U) increases the injected neutral beam power up to 12 MW and the plasma current up to I p = 2 MA for plasma durations up to 5 s. The graphite plasma facing components have been re-designed to handle greater heat and energy fluxes than were seen in NSTX using a castellated design. We present the experimental testing and validation of a castellated graphite target, similar to the prototype tile design, instrumented with thermocouples at various depths in the castellation. During testing, incident heat flux is provided by a programmed electron beam system and surface temperatures are measured via infrared thermography directly viewing the target surface. It was found that the thermocouple response scaled linearly with the measured surface temperature rise regardless of thermocouple depth in the castellation. A sensitivity of 14.3 °C/kJ of deposited energy was found when treating individual castellations as a semi-infinite solid.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [2]; ORCiD logo [1];  [2];  [2];  [3];  [2];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. The Pennsylvania State Univ., State College, PA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1483183
Alternate Identifier(s):
OSTI ID: 1479834
Grant/Contract Number:  
AC05-00OR22725; AC02-09CH11466; AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Gray, Travis K., Allen, Nicole, Reinke, Matthew L., Smalley, Gustav, Youchison, Dennis L., Ellis, Robert, Jaworski, M. A., Looby, Thomas, Mardenfeld, Michael, and Wolfe, Douglas E. Integrated plasma facing component calorimetry for measurement of shot integrated deposited energy in the NSTX-U. United States: N. p., 2018. Web. doi:10.1063/1.5039337.
Gray, Travis K., Allen, Nicole, Reinke, Matthew L., Smalley, Gustav, Youchison, Dennis L., Ellis, Robert, Jaworski, M. A., Looby, Thomas, Mardenfeld, Michael, & Wolfe, Douglas E. Integrated plasma facing component calorimetry for measurement of shot integrated deposited energy in the NSTX-U. United States. doi:10.1063/1.5039337.
Gray, Travis K., Allen, Nicole, Reinke, Matthew L., Smalley, Gustav, Youchison, Dennis L., Ellis, Robert, Jaworski, M. A., Looby, Thomas, Mardenfeld, Michael, and Wolfe, Douglas E. Tue . "Integrated plasma facing component calorimetry for measurement of shot integrated deposited energy in the NSTX-U". United States. doi:10.1063/1.5039337.
@article{osti_1483183,
title = {Integrated plasma facing component calorimetry for measurement of shot integrated deposited energy in the NSTX-U},
author = {Gray, Travis K. and Allen, Nicole and Reinke, Matthew L. and Smalley, Gustav and Youchison, Dennis L. and Ellis, Robert and Jaworski, M. A. and Looby, Thomas and Mardenfeld, Michael and Wolfe, Douglas E.},
abstractNote = {Here, the upgrade to the National Spherical Torus eXperiment (NSTX-U) increases the injected neutral beam power up to 12 MW and the plasma current up to Ip = 2 MA for plasma durations up to 5 s. The graphite plasma facing components have been re-designed to handle greater heat and energy fluxes than were seen in NSTX using a castellated design. We present the experimental testing and validation of a castellated graphite target, similar to the prototype tile design, instrumented with thermocouples at various depths in the castellation. During testing, incident heat flux is provided by a programmed electron beam system and surface temperatures are measured via infrared thermography directly viewing the target surface. It was found that the thermocouple response scaled linearly with the measured surface temperature rise regardless of thermocouple depth in the castellation. A sensitivity of 14.3 °C/kJ of deposited energy was found when treating individual castellations as a semi-infinite solid.},
doi = {10.1063/1.5039337},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 30, 2019
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