Snowflake divertor configuration studies for NSTX-Upgrade

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Snowflake divertor experiments in NSTX provide basis for PMI development toward NSTX-Upgrade. Snowflake configuration formation was followed by radiative detachment. Significant reduction of steady-state divertor heat flux observed in snowflake divertor. Impulsive heat loads due to Type I ELMs are partially mitigated in snowflake divertor. Magnetic control of snowflake divertor configuration is being developed. Plasma material interface development is critical for NSTX-U success. Four divertor coils should enable flexibility in boundary shaping and control in NSTX-U. Snowflake divertor experiments in NSTX provide good basis for PMI development in NSTX-Upgrade. FY 2009-2010 snowflake divertor experiments in NSTX: (1) Helped understand control ... continued below

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Soukhanovskii, V A November 12, 2011.

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Snowflake divertor experiments in NSTX provide basis for PMI development toward NSTX-Upgrade. Snowflake configuration formation was followed by radiative detachment. Significant reduction of steady-state divertor heat flux observed in snowflake divertor. Impulsive heat loads due to Type I ELMs are partially mitigated in snowflake divertor. Magnetic control of snowflake divertor configuration is being developed. Plasma material interface development is critical for NSTX-U success. Four divertor coils should enable flexibility in boundary shaping and control in NSTX-U. Snowflake divertor experiments in NSTX provide good basis for PMI development in NSTX-Upgrade. FY 2009-2010 snowflake divertor experiments in NSTX: (1) Helped understand control of magnetic properties; (2) Core H-mode confinement unchanged; (3) Core and edge carbon concentration reduced; and (4) Divertor heat flux significantly reduced - (a) Steady-state reduction due to geometry and radiative detachment, (b) Encouraging results for transient heat flux handling, (c) Combined with impurity-seeded radiative divertor. Outlook for snowflake divertor in NSTX-Upgrade: (1) 2D fluid modeling of snowflake divertor properties scaling - (a) Edge and divertor transport, radiation, detachment threshold, (b) Compatibility with cryo-pump and lithium conditioning; (2) Magnetic control development; and (3) PFC development - PFC alignment and PFC material choice.

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PDF-file: 26 pages; size: 4.7 Mbytes

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  • Presented at: 53rd Annual Meeting of the APS Division of Plasma Physics, Salt Lake City, UT, United States, Nov 14 - Nov 18, 2011

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  • Report No.: LLNL-CONF-514131
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1035601
  • Archival Resource Key: ark:/67531/metadc831238

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  • November 12, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 1, 2016, 10:27 p.m.

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Soukhanovskii, V A. Snowflake divertor configuration studies for NSTX-Upgrade, article, November 12, 2011; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc831238/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.