Injected mass deposition thresholds for lithium granule instigated triggering of edge localized modes on EAST

R. Lunsford; Z. Sun; R. Maingi; J. S. Hu; D. Mansfield; W. Xu; G. Z. Zuo; A. Diallo; T. Osborne; K. Tritz; J. Canik; M. Huang; X. C. Meng; X. Z. Gong; B. N. Wan; J. G. Li

doi:10.1088/1741-4326/aaa2ac

Injected mass deposition thresholds for lithium granule instigated triggering of edge localized modes on EAST

R. Lunsford, Z. Sun, R. Maingi, J. S. Hu, D. Mansfield, W. Xu, G. Z. Zuo, A. Diallo, T. Osborne, K. Tritz, J. Canik, M. Huang, X. C. Meng, X. Z. Gong, B. N. Wan, J. G. Li

Fusion Energy Division

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

30 Scopus citations

Abstract

The ability of an injected lithium granule to promptly trigger an edge localized mode (ELM) has been established in multiple experiments. By horizontally injecting granules ranging in diameter from 200 microns to 1 mm in diameter into the low field side of EAST H-mode discharges we have determined that granules with diameter >600 microns are successful in triggering ELMs more than 95% of the time. It was also demonstrated that below 600 microns the triggering efficiency decreased roughly with granule size. Granules were radially injected from the outer midplane with velocities ∼80 m s^-1 into EAST upper single null discharges with an ITER like tungsten monoblock divertor. These granules were individually tracked throughout their injection cycle in order to determine their efficacy at triggering an ELM. For those granules of sufficient size, ELM triggering was a prompt response to granule injection. By simulating the granule injection with an experimentally benchmarked neutral gas shielding (NGS) model, the ablatant mass deposition required to promptly trigger an ELM is calculated and the fractional mass deposition is determined.

Original language	English
Article number	036007
Journal	Nuclear Fusion
Volume	58
Issue number	3
DOIs	https://doi.org/10.1088/1741-4326/aaa2ac
State	Published - Jan 16 2018

Funding

This research was supported in part by the National Key Research and Development Program of China under Contract No. 2017YFA0402500 and the US Dept. of Energy Contracts DE-AC02-09CH11466, DE-FG02-09ER55012 and DE-FC02-04ER54698, and partly by the National Nature Science Foundation of China under Contract No. 11625524, No. 11605246, No. 11775261 We gratefully acknowledge the contributions from the EAST technical staff! The digital data for this paper can be found at http://arks.princeton.edu/ ark:/88435/dsp01pk02cd394. Notice: This manuscript is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, and has been authored by Princeton University under Contract Number DE-AC02-09CH11466 with the U.S. Department of Energy. The publisher, by accepting the article for publication acknowledges, that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes.

Funders	Funder number
U.S. Department of Energy	DE-FC02-04ER54698, DE-FG02-09ER55012
Office of Science
Fusion Energy Sciences
Princeton University	DE-AC02-09CH11466
National Natural Science Foundation of China	11605246, 11625524, 11775261
National Key Research and Development Program of China	2017YFA0402500

Keywords

EAST
ELM triggering
Granule injection
lithium

UN SDGs

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

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10.1088/1741-4326/aaa2ac

Cite this

Lunsford, R., Sun, Z., Maingi, R., Hu, J. S., Mansfield, D., Xu, W., Zuo, G. Z., Diallo, A., Osborne, T., Tritz, K., Canik, J., Huang, M., Meng, X. C., Gong, X. Z., Wan, B. N., & Li, J. G. (2018). Injected mass deposition thresholds for lithium granule instigated triggering of edge localized modes on EAST. Nuclear Fusion, 58(3), Article 036007. https://doi.org/10.1088/1741-4326/aaa2ac

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abstract = "The ability of an injected lithium granule to promptly trigger an edge localized mode (ELM) has been established in multiple experiments. By horizontally injecting granules ranging in diameter from 200 microns to 1 mm in diameter into the low field side of EAST H-mode discharges we have determined that granules with diameter >600 microns are successful in triggering ELMs more than 95% of the time. It was also demonstrated that below 600 microns the triggering efficiency decreased roughly with granule size. Granules were radially injected from the outer midplane with velocities ∼80 m s-1 into EAST upper single null discharges with an ITER like tungsten monoblock divertor. These granules were individually tracked throughout their injection cycle in order to determine their efficacy at triggering an ELM. For those granules of sufficient size, ELM triggering was a prompt response to granule injection. By simulating the granule injection with an experimentally benchmarked neutral gas shielding (NGS) model, the ablatant mass deposition required to promptly trigger an ELM is calculated and the fractional mass deposition is determined.",

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AU - Canik, J.

AU - Huang, M.

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AU - Gong, X. Z.

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N2 - The ability of an injected lithium granule to promptly trigger an edge localized mode (ELM) has been established in multiple experiments. By horizontally injecting granules ranging in diameter from 200 microns to 1 mm in diameter into the low field side of EAST H-mode discharges we have determined that granules with diameter >600 microns are successful in triggering ELMs more than 95% of the time. It was also demonstrated that below 600 microns the triggering efficiency decreased roughly with granule size. Granules were radially injected from the outer midplane with velocities ∼80 m s-1 into EAST upper single null discharges with an ITER like tungsten monoblock divertor. These granules were individually tracked throughout their injection cycle in order to determine their efficacy at triggering an ELM. For those granules of sufficient size, ELM triggering was a prompt response to granule injection. By simulating the granule injection with an experimentally benchmarked neutral gas shielding (NGS) model, the ablatant mass deposition required to promptly trigger an ELM is calculated and the fractional mass deposition is determined.

AB - The ability of an injected lithium granule to promptly trigger an edge localized mode (ELM) has been established in multiple experiments. By horizontally injecting granules ranging in diameter from 200 microns to 1 mm in diameter into the low field side of EAST H-mode discharges we have determined that granules with diameter >600 microns are successful in triggering ELMs more than 95% of the time. It was also demonstrated that below 600 microns the triggering efficiency decreased roughly with granule size. Granules were radially injected from the outer midplane with velocities ∼80 m s-1 into EAST upper single null discharges with an ITER like tungsten monoblock divertor. These granules were individually tracked throughout their injection cycle in order to determine their efficacy at triggering an ELM. For those granules of sufficient size, ELM triggering was a prompt response to granule injection. By simulating the granule injection with an experimentally benchmarked neutral gas shielding (NGS) model, the ablatant mass deposition required to promptly trigger an ELM is calculated and the fractional mass deposition is determined.

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Injected mass deposition thresholds for lithium granule instigated triggering of edge localized modes on EAST

Abstract

Funding

Keywords

UN SDGs

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