Thermal quench mitigation and current quench control by injection of mixed species shattered pellets in DIII-D

Shiraki, D.; Commaux, N.; Baylor, L. R.; Eidietis, N. W.; Hollmann, E. M.; Moyer, R. A.; Lasnier, C. J.

doi:10.1063/1.4954389

Title: Thermal quench mitigation and current quench control by injection of mixed species shattered pellets in DIII-D

Journal Article · Wed Jun 15 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4954389· OSTI ID:22598939

Shiraki, D.; Commaux, N.; Baylor, L. R. ^[1]; Eidietis, N. W. ^[2]; Hollmann, E. M.; Moyer, R. A. ^[3]; Lasnier, C. J. ^[4]

Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831 (United States)
General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)
University of California-San Diego, 9500 Gilman Dr., La Jolla, California 921093-0417 (United States)
Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808 (United States)

Injection of large shattered pellets composed of variable quantities of the main ion species (deuterium) and high-Z impurities (neon) in the DIII-D tokamak demonstrates control of thermal quench (TQ) and current quench (CQ) properties in mitigated disruptions. As the pellet composition is varied, TQ radiation fractions increase continuously with the quantity of radiating impurity in the pellet, with a corresponding decrease in divertor heating. Post-TQ plasma resistivities increase as a result of the higher radiation fraction, allowing control of current decay timescales based on the pellet composition. Magnetic reconstructions during the CQ show that control of the current decay rate allows continuous variation of the minimum safety factor during the vertically unstable disruption, reducing the halo current fraction and resulting vessel displacement. Both TQ and CQ characteristics are observed to saturate at relatively low quantities of neon, indicating that effective mitigation of disruption loads by shattered pellet injection (SPI) can be achieved with modest impurity quantities, within injection quantities anticipated for ITER. This mixed species SPI technique provides a possible approach for tuning disruption properties to remain within the limited ranges allowed in the ITER design.

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OSTI ID:: 22598939

Journal Information:: Physics of Plasmas, Vol. 23, Issue 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X

Country of Publication:: United States

Language:: English

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Pellet-Injector Technology—Brief History and Key Developments in the Last 25 Years Combs, S. K.; Baylor, L. R. Fusion Science and Technology, Vol. 73, Issue 4 https://doi.org/10.1080/15361055.2017.1421367	journal	December 2017
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