DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

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 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.

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:
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. https://doi.org/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. https://doi.org/10.1063/1.5039337. https://www.osti.gov/servlets/purl/1483183.
@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},
number = 10,
volume = 89,
place = {United States},
year = {Tue Oct 30 00:00:00 EDT 2018},
month = {Tue Oct 30 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Calorimeter probe for the DIII-D divertor
journal, March 2003

  • Watkins, J. G.; Lasnier, C. J.; Whyte, D. G.
  • Review of Scientific Instruments, Vol. 74, Issue 3
  • DOI: 10.1063/1.1527241

Dependence of divertor heat flux widths on heating power, flux expansion, and plasma current in the NSTX
journal, August 2011


Graphite Tile Thermal Performance on the New DIII-D Lower Divertor
journal, October 2007

  • Murphy, C. J.; Anderson, P. M.; Lasnier, C. J.
  • Fusion Science and Technology, Vol. 52, Issue 3
  • DOI: 10.13182/FST07-A1544

Calorimetry in Tore Supra.
journal, March 2003


Divertor energy distribution in JET H-modes
journal, March 2001


Use of graphite in Langmuir‐calorimeter probe heads
journal, August 1986

  • Kilpatrick, S.; Manos, D.; Stangeby, P.
  • Review of Scientific Instruments, Vol. 57, Issue 8
  • DOI: 10.1063/1.1138743

Energy flux to the ASDEX-Upgrade diverter plates determined by thermography and calorimetry
journal, January 1995


Calorimeter probe studies of PDX and PLT
journal, November 1982


Overview of the physics and engineering design of NSTX upgrade
journal, July 2012


Heat flux measurement techniques
journal, July 1999

  • Childs, P. R. N.; Greenwood, J. R.; Long, C. A.
  • Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, Vol. 213, Issue 7
  • DOI: 10.1177/095440629921300702

Works referencing / citing this record:

Development and Performance of Tungsten-Coated Graphitic Foam for Plasma-Facing Components
journal, May 2019