Interpretive MHD modeling of dispersive shell pellet injection for rapid shutdown in tokamaks

Izzo, Valerie A.

doi:10.1088/1741-4326/ab8544

Title: Interpretive MHD modeling of dispersive shell pellet injection for rapid shutdown in tokamaks

Journal Article · Wed Apr 01 00:00:00 EDT 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab8544· OSTI ID:1607855

^[1]

Fiat Lux, San Diego, CA (United States)

Dispersive shell pellet (DSP) injection is modeled with the extended-MHD code NIMROD for interpretive insight into the results of recent DIII-D DSP experiments and to explore the dynamics of an inside-out thermal quench for disruption mitigation in tokamaks. Simulations of the pre-thermal quench (TQ) phase indicate that the upper bound for the quantity of ablated carbon shell material that will not perturb the flux surfaces is in the ballpark of, but somewhat below the experimental quantity. Even below this quantity, sufficient electrons are added to the plasma by the shell material to produce significant dilution cooling before the TQ is triggered. Simulations carried through the end of the TQ have very large amplitude MHD fluctuations (δB/B>10^-2) at the time of the plasma current spike associated with current profile redistribution. Finally, after the plasma current spike, which is of comparable amplitude to that measured in DIII-D experiments, none of the runaway electron test-particles whose orbits are tracked throughout the simulation remain confined.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-95ER54309; FC02-04ER54698; AC02-05CH11231

OSTI ID:: 1607855

Alternate ID(s):: OSTI ID: 1618152

Report Number(s):: DOE-GA-54309; DE-FC02-04ER54698; TRN: US2104992

Journal Information:: Nuclear Fusion, Vol. 60, Issue 6; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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References (21)

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