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

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.

doi:10.1063/1.5039337

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

Journal Article · Tue Oct 30 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5039337· OSTI ID:1483183

^[1]; Allen, Nicole ^[2];

^[1]; Smalley, Gustav ^[2];

^[1]; Ellis, Robert ^[2]; Jaworski, M. A. ^[2]; Looby, Thomas ^[3]; Mardenfeld, Michael ^[2]; Wolfe, Douglas E. ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Tennessee, Knoxville, TN (United States)
The Pennsylvania State Univ., State College, PA (United States)

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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; AC02-09CH11466; AC52-07NA27344

OSTI ID:: 1483183

Alternate ID(s):: OSTI ID: 1479834

Journal Information:: Review of Scientific Instruments, Vol. 89, Issue 10; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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References (10)

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Cited By (1)

Development and Performance of Tungsten-Coated Graphitic Foam for Plasma-Facing Components Youchison, D. L.; Coenen, J. W.; Gray, T. K. Fusion Science and Technology, Vol. 75, Issue 6 https://doi.org/10.1080/15361055.2019.1607706	journal	May 2019

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