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

T. K. Gray, N. Allen, M. L. Reinke, G. Smalley, D. L. Youchison, R. Ellis, M. A. Jaworski, T. Looby, M. Mardenfeld, Douglas Edward Wolfe

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The upgrade to the National Spherical Torus eXperiment (NSTX-U) [J. Menard et al., Nucl. Fusion 52, 083015 (2012)] 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.

Original languageEnglish (US)
Article number10J128
JournalReview of Scientific Instruments
Volume89
Issue number10
DOIs
StatePublished - Oct 1 2018

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Calorimetry
thermocouples
Thermocouples
shot
heat measurement
Plasmas
surface temperature
heat flux
Graphite
graphite
plasma currents
tiles
neutral beams
Testing
Tile
energy
Heat flux
Electron beams
Fusion reactions
fusion

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Gray, T. K. ; Allen, N. ; Reinke, M. L. ; Smalley, G. ; Youchison, D. L. ; Ellis, R. ; Jaworski, M. A. ; Looby, T. ; Mardenfeld, M. ; Wolfe, Douglas Edward. / Integrated plasma facing component calorimetry for measurement of shot integrated deposited energy in the NSTX-U. In: Review of Scientific Instruments. 2018 ; Vol. 89, No. 10.
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Gray, TK, Allen, N, Reinke, ML, Smalley, G, Youchison, DL, Ellis, R, Jaworski, MA, Looby, T, Mardenfeld, M & Wolfe, DE 2018, 'Integrated plasma facing component calorimetry for measurement of shot integrated deposited energy in the NSTX-U' Review of Scientific Instruments, vol. 89, no. 10, 10J128. https://doi.org/10.1063/1.5039337

Integrated plasma facing component calorimetry for measurement of shot integrated deposited energy in the NSTX-U. / Gray, T. K.; Allen, N.; Reinke, M. L.; Smalley, G.; Youchison, D. L.; Ellis, R.; Jaworski, M. A.; Looby, T.; Mardenfeld, M.; Wolfe, Douglas Edward.

In: Review of Scientific Instruments, Vol. 89, No. 10, 10J128, 01.10.2018.

Research output: Contribution to journalArticle

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AU - Gray, T. K.

AU - Allen, N.

AU - Reinke, M. L.

AU - Smalley, G.

AU - Youchison, D. L.

AU - Ellis, R.

AU - Jaworski, M. A.

AU - Looby, T.

AU - Mardenfeld, M.

AU - Wolfe, Douglas Edward

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