Measurements of heat flux components due to charged and non-charged particles in DIII-D divertor near and under detachment

J. Ren; D. C. Donovan; J. G. Watkins; H. Q. Wang; X. X. Ma; R. Maurizio; M. W. Shafer; D. Rudakov; P. C. Stangeby; D. Thomas; S. Hong

doi:10.1016/j.nme.2023.101523

Measurements of heat flux components due to charged and non-charged particles in DIII-D divertor near and under detachment

J. Ren, D. C. Donovan, J. G. Watkins, H. Q. Wang, X. X. Ma, R. Maurizio, M. W. Shafer, D. Rudakov, P. C. Stangeby, D. Thomas, S. Hong

Advanced Tokamak Physics

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

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Abstract

Surfacing Eroding Thermocouples (SETC) have been used to provide high spatial and temporal resolution heat flux measurement in DIII-D. SETCs were first tested in the lower divertor of DIII-D using the Divertor Material Evaluation System (DiMES), then an array of SETCS was permanently installed in the upper SAS-VW divertor for studying the heat flux mitigation in closed divertor geometry. SETCs proved that inducing divertor detachment with various methods is an effective way to reduce the peak heat flux at the divertor targets. In the investigated discharges the heat flux is reduced to less than 30% under detachment compared to attached conditions. A new method of using the combination of recessed SETC and flush SETC was demonstrated to be able to measure the heat flux from volumetric radiation and the charge exchange neutrals. It was observed that the magnitude of the heat flux from radiation and charge exchange neutrals increased during the process of detachment. While 30% of the total incident heat flux is attributable to the volumetric radiation and the charge exchange neutrals in the fully detached divertor condition with B×∇B drift into the divertor, it could reach more than 60% with B×∇B drift away from the divertor.

Original language	English
Article number	101523
Journal	Nuclear Materials and Energy
Volume	37
DOIs	https://doi.org/10.1016/j.nme.2023.101523
State	Published - Dec 2023

Funding

This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences , using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Award(s) DE-FC02-04ER54698, DE-SC0019256, DE-SC0023378, DE-NA0003525 and DE-AC05-00OR22725. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Award(s) DE-FC02-04ER54698, DE-SC0019256, DE-SC0023378, DE-NA0003525 and DE-AC05-00OR22725. This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

Funders	Funder number
United States Government
U.S. Department of Energy
Office of Science	DE-SC0023378, DE-AC05-00OR22725, DE-SC0019256, DE-NA0003525, DE-FC02-04ER54698
Fusion Energy Sciences

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Ren, J., Donovan, D. C., Watkins, J. G., Wang, H. Q., Ma, X. X., Maurizio, R., Shafer, M. W., Rudakov, D., Stangeby, P. C., Thomas, D., & Hong, S. (2023). Measurements of heat flux components due to charged and non-charged particles in DIII-D divertor near and under detachment. Nuclear Materials and Energy, 37, Article 101523. https://doi.org/10.1016/j.nme.2023.101523

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abstract = "Surfacing Eroding Thermocouples (SETC) have been used to provide high spatial and temporal resolution heat flux measurement in DIII-D. SETCs were first tested in the lower divertor of DIII-D using the Divertor Material Evaluation System (DiMES), then an array of SETCS was permanently installed in the upper SAS-VW divertor for studying the heat flux mitigation in closed divertor geometry. SETCs proved that inducing divertor detachment with various methods is an effective way to reduce the peak heat flux at the divertor targets. In the investigated discharges the heat flux is reduced to less than 30% under detachment compared to attached conditions. A new method of using the combination of recessed SETC and flush SETC was demonstrated to be able to measure the heat flux from volumetric radiation and the charge exchange neutrals. It was observed that the magnitude of the heat flux from radiation and charge exchange neutrals increased during the process of detachment. While 30% of the total incident heat flux is attributable to the volumetric radiation and the charge exchange neutrals in the fully detached divertor condition with B×∇B drift into the divertor, it could reach more than 60% with B×∇B drift away from the divertor.",

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AU - Ren, J.

AU - Donovan, D. C.

AU - Watkins, J. G.

AU - Wang, H. Q.

AU - Ma, X. X.

AU - Maurizio, R.

AU - Shafer, M. W.

AU - Rudakov, D.

AU - Stangeby, P. C.

AU - Thomas, D.

AU - Hong, S.

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Measurements of heat flux components due to charged and non-charged particles in DIII-D divertor near and under detachment

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