Mitigation of upward and downward vertical displacement event heat loads with upper or lower massive gas injection in DIII-D

Hollmann, E. M.; Commaux, N.; Eidietis, N. W.; Lasnier, C. J.; Moyer, R. A.; Parks, P. B.; Shiraki, D.

doi:10.1063/1.4932999

Title: Mitigation of upward and downward vertical displacement event heat loads with upper or lower massive gas injection in DIII-D

Journal Article · Mon Oct 12 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4932999· OSTI ID:1305836

Hollmann, E. M. ^[1]; Commaux, N. ^[2]; Eidietis, N. W. ^[3]; Lasnier, C. J. ^[4];

^[1];

^[3]; Shiraki, D. ^[2]

Univ. of California-San Diego, La Jolla, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Intentionally triggered upward and downward vertical displacement events (VDEs) leading to disruptions were pre-emptively mitigated with neon massive gas injection (MGI) coming from either above or below the plasma. Global indicators of disruption mitigation effectiveness (conducted heat loads, radiated power, and vessel motion) do not show a clear improvement when mitigating with the gas jet located closer to the VDE impact area. A clear trend of improved mitigation is observed for earlier MGI timing relative to the VDE impact time. The plasma edge magnetic perturbation is seen to lock to a preferential phase during the VDE thermal quench, but this phase is not clearly matched by preliminary attempts to fit to the conducted heat load phase. Clear indications of plasma infra-red (IR) emission are observed both before and during the disruptions. This IR emission can affect calculation of disruption heat loads; here, the time decay of post-disruption IR signals is used to correct for this effect.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC52-07NA27344; FG02-07ER54917; FC02-04ER54698; AC05-00OR22725; AC05- 06OR23100; AC05-06OR23100

OSTI ID:: 1305836

Alternate ID(s):: OSTI ID: 1223546; OSTI ID: 1266858; OSTI ID: 1367527

Report Number(s):: LLNL-JRNL-669748; PHPAEN

Journal Information:: Physics of Plasmas, Vol. 22, Issue 10; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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References (18)

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Cited By (2)

Measurement of toroidal variation in conducted heat loads in locked mode induced disruptions on DIII-D Hollmann, E. M.; Commaux, N.; Eidietis, N. W. Physics of Plasmas, Vol. 25, Issue 10 https://doi.org/10.1063/1.5052450	journal	October 2018
Injection of multiple shattered pellets for disruption mitigation in DIII-D Herfindal, J. L.; Shiraki, D.; Baylor, L. R. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab3693	journal	September 2019

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Title: Mitigation of upward and downward vertical displacement event heat loads with upper or lower massive gas injection in DIII-D

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