Measurements of injected impurity assimilation during massive gas injection experiments in DIII-D

E. M. Hollmann; T. C. Jernigan; P. B. Parks; J. A. Boedo; T. E. Evans; M. Groth; D. A. Humphreys; A. N. James; M. J. Lanctot; D. Nishijima; D. L. Rudakov; H. A. Scott; E. J. Strait; M. A. Van Zeeland; J. C. Wesley; W. P. West; W. Wu; J. H. Yu

doi:10.1088/0029-5515/48/11/115007

Measurements of injected impurity assimilation during massive gas injection experiments in DIII-D

E. M. Hollmann, T. C. Jernigan, P. B. Parks, J. A. Boedo, T. E. Evans, M. Groth, D. A. Humphreys, A. N. James, M. J. Lanctot, D. Nishijima, D. L. Rudakov, H. A. Scott, E. J. Strait, M. A. Van Zeeland, J. C. Wesley, W. P. West, W. Wu, J. H. Yu

Not published at Aalto University

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76 Citations (Scopus)

Abstract

Impurities (H₂, D₂, He, Ne or Ar) injected into steady (non-disrupting) discharges with massive gas injection (MGI) are shown to mix into the plasma core dominantly via magnetohydrodynamic activity during the plasma thermal quench (TQ). Mixing efficiencies of injected impurities into the plasma core are measured to be of order 0.05-0.4. 0D modelling of the experiments is found to reproduce observed TQ and current quench durations reasonably well (typically within ± 25% or so), although shutdown onset times are underestimated (by around 2×). Preliminary 0D modelling of ITER based on DIII-D mixing efficiencies suggests that MGI will work well in ITER with regard to disruption heat load and vessel force mitigation, but may not collisionally suppress runaway electrons.

Original language	English
Article number	115007
Pages (from-to)	1-12
Number of pages	12
Journal	Nuclear Fusion
Volume	48
Issue number	11
DOIs	https://doi.org/10.1088/0029-5515/48/11/115007
Publication status	Published - 1 Nov 2008
MoE publication type	A1 Journal article-refereed

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Hollmann, E. M., Jernigan, T. C., Parks, P. B., Boedo, J. A., Evans, T. E., Groth, M., Humphreys, D. A., James, A. N., Lanctot, M. J., Nishijima, D., Rudakov, D. L., Scott, H. A., Strait, E. J., Van Zeeland, M. A., Wesley, J. C., West, W. P., Wu, W., & Yu, J. H. (2008). Measurements of injected impurity assimilation during massive gas injection experiments in DIII-D. Nuclear Fusion, 48(11), 1-12. Article 115007. https://doi.org/10.1088/0029-5515/48/11/115007

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title = "Measurements of injected impurity assimilation during massive gas injection experiments in DIII-D",

abstract = "Impurities (H2, D2, He, Ne or Ar) injected into steady (non-disrupting) discharges with massive gas injection (MGI) are shown to mix into the plasma core dominantly via magnetohydrodynamic activity during the plasma thermal quench (TQ). Mixing efficiencies of injected impurities into the plasma core are measured to be of order 0.05-0.4. 0D modelling of the experiments is found to reproduce observed TQ and current quench durations reasonably well (typically within ± 25% or so), although shutdown onset times are underestimated (by around 2×). Preliminary 0D modelling of ITER based on DIII-D mixing efficiencies suggests that MGI will work well in ITER with regard to disruption heat load and vessel force mitigation, but may not collisionally suppress runaway electrons.",

author = "Hollmann, {E. M.} and Jernigan, {T. C.} and Parks, {P. B.} and Boedo, {J. A.} and Evans, {T. E.} and M. Groth and Humphreys, {D. A.} and James, {A. N.} and Lanctot, {M. J.} and D. Nishijima and Rudakov, {D. L.} and Scott, {H. A.} and Strait, {E. J.} and {Van Zeeland}, {M. A.} and Wesley, {J. C.} and West, {W. P.} and W. Wu and Yu, {J. H.}",

year = "2008",

month = nov,

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doi = "10.1088/0029-5515/48/11/115007",

language = "English",

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Hollmann, EM, Jernigan, TC, Parks, PB, Boedo, JA, Evans, TE, Groth, M, Humphreys, DA, James, AN, Lanctot, MJ, Nishijima, D, Rudakov, DL, Scott, HA, Strait, EJ, Van Zeeland, MA, Wesley, JC, West, WP, Wu, W & Yu, JH 2008, 'Measurements of injected impurity assimilation during massive gas injection experiments in DIII-D', Nuclear Fusion, vol. 48, no. 11, 115007, pp. 1-12. https://doi.org/10.1088/0029-5515/48/11/115007

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T1 - Measurements of injected impurity assimilation during massive gas injection experiments in DIII-D

AU - Hollmann, E. M.

AU - Jernigan, T. C.

AU - Parks, P. B.

AU - Boedo, J. A.

AU - Evans, T. E.

AU - Groth, M.

AU - Humphreys, D. A.

AU - James, A. N.

AU - Lanctot, M. J.

AU - Nishijima, D.

AU - Rudakov, D. L.

AU - Scott, H. A.

AU - Strait, E. J.

AU - Van Zeeland, M. A.

AU - Wesley, J. C.

AU - West, W. P.

AU - Wu, W.

AU - Yu, J. H.

PY - 2008/11/1

Y1 - 2008/11/1

N2 - Impurities (H2, D2, He, Ne or Ar) injected into steady (non-disrupting) discharges with massive gas injection (MGI) are shown to mix into the plasma core dominantly via magnetohydrodynamic activity during the plasma thermal quench (TQ). Mixing efficiencies of injected impurities into the plasma core are measured to be of order 0.05-0.4. 0D modelling of the experiments is found to reproduce observed TQ and current quench durations reasonably well (typically within ± 25% or so), although shutdown onset times are underestimated (by around 2×). Preliminary 0D modelling of ITER based on DIII-D mixing efficiencies suggests that MGI will work well in ITER with regard to disruption heat load and vessel force mitigation, but may not collisionally suppress runaway electrons.

AB - Impurities (H2, D2, He, Ne or Ar) injected into steady (non-disrupting) discharges with massive gas injection (MGI) are shown to mix into the plasma core dominantly via magnetohydrodynamic activity during the plasma thermal quench (TQ). Mixing efficiencies of injected impurities into the plasma core are measured to be of order 0.05-0.4. 0D modelling of the experiments is found to reproduce observed TQ and current quench durations reasonably well (typically within ± 25% or so), although shutdown onset times are underestimated (by around 2×). Preliminary 0D modelling of ITER based on DIII-D mixing efficiencies suggests that MGI will work well in ITER with regard to disruption heat load and vessel force mitigation, but may not collisionally suppress runaway electrons.

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JF - Nuclear Fusion

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ER -

Measurements of injected impurity assimilation during massive gas injection experiments in DIII-D

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