Development of Surface Eroding Thermocouples in Small Angle Slot Divertor in DIII-D

J. Ren; D. Donovan; J. G. Watkins; H. Q. Wang; D. Rudakov; C. Murphy; E. Unterberg; D. Thomas; R. Boivin

doi:10.1109/TPS.2019.2943085

Development of Surface Eroding Thermocouples in Small Angle Slot Divertor in DIII-D

J. Ren, D. Donovan, J. G. Watkins, H. Q. Wang, D. Rudakov, C. Murphy, E. Unterberg, D. Thomas, R. Boivin

Power Exhaust and Particle Control

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The surface eroding thermocouple (SETC) has proved to be a useful fast local temperature and heat flux diagnostic since its application in DIII-D. The SETC system in DIII-D was upgraded, and seven new SETCs were installed in the small angle slot (SAS) divertor to create a localized poloidal array to provide heat flux profiles with sub-10-ms temporal resolution. In addition, a smaller SETC was developed to increase the spatial resolution and simplify installation in the SAS divertor. The SETC-containing tiles were re-engineered with a double-wide format so that the distance between the SETCs and the tile edges is extended to 10 cm on both sides, giving additional tolerance for tile-to-tile misalignments. Mineral insulated thermocouple cable with a metal sheath has also been implemented to further reduce noise and magnetic pickup. Recent measurements obtained from the SETCs indicate that the newly installed SETC array in the SAS divertor is able to provide important heat flux information to various physics experiments in closed divertors.

Original language	English
Article number	8863142
Pages (from-to)	1804-1809
Number of pages	6
Journal	IEEE Transactions on Plasma Science
Volume	48
Issue number	6
DOIs	https://doi.org/10.1109/TPS.2019.2943085
State	Published - Jun 2020

Funding

Manuscript received July 31, 2019; revised August 27, 2019; accepted September 18, 2019. Date of publication October 8, 2019; date of current version June 10, 2020. This work was supported by the U.S. Department of Energy under Contract DE-SC0016318, Contract DE-FC02-04ER54698, Contract DE-AC05-00OR22725, Contract DE-SC0019256, Contract DE-FG02-07ER54917, and Contract DE-NA0003525. The review of this article was arranged by Senior Editor G. H. Neilson. (Corresponding author: J. Ren.) J. Ren and D. Donovan are with the Department of Nuclear Engineering, University of Tennessee–Knoxville, Knoxville, TN 37996 USA (e-mail: [email protected]; [email protected]).

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725, DE-SC0016318, DE-SC0019256, DE-NA0003525, DE-FC02-04ER54698, DE-FG02-07ER54917

Keywords

Divertor
heat flux
thermocouple

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1109/TPS.2019.2943085

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title = "Development of Surface Eroding Thermocouples in Small Angle Slot Divertor in DIII-D",

abstract = "The surface eroding thermocouple (SETC) has proved to be a useful fast local temperature and heat flux diagnostic since its application in DIII-D. The SETC system in DIII-D was upgraded, and seven new SETCs were installed in the small angle slot (SAS) divertor to create a localized poloidal array to provide heat flux profiles with sub-10-ms temporal resolution. In addition, a smaller SETC was developed to increase the spatial resolution and simplify installation in the SAS divertor. The SETC-containing tiles were re-engineered with a double-wide format so that the distance between the SETCs and the tile edges is extended to 10 cm on both sides, giving additional tolerance for tile-to-tile misalignments. Mineral insulated thermocouple cable with a metal sheath has also been implemented to further reduce noise and magnetic pickup. Recent measurements obtained from the SETCs indicate that the newly installed SETC array in the SAS divertor is able to provide important heat flux information to various physics experiments in closed divertors.",

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AU - Unterberg, E.

AU - Thomas, D.

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Development of Surface Eroding Thermocouples in Small Angle Slot Divertor in DIII-D

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Keywords

UN SDGs

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