Mitigation of upward and downward vertical displacement event heat loads with upper or lower massive gas injection in DIII-D
Abstract
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.
- Authors:
-
[1];
[3];
- 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)
- Publication Date:
- Research Org.:
- 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 Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1305836
- Alternate Identifier(s):
- OSTI ID: 1223546; OSTI ID: 1266858; OSTI ID: 1367527
- Report Number(s):
- LLNL-JRNL-669748
Journal ID: ISSN 1070-664X; PHPAEN
- Grant/Contract Number:
- AC52-07NA27344; FG02-07ER54917; FC02-04ER54698; AC05-00OR22725; AC05- 06OR23100; AC05-06OR23100
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 10; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Divertors; Plasma temperature; Toroidal plasma confinement; Vertical displacement events; VDEs; 54 ENVIRONMENTAL SCIENCES; divertors; toroidal plasma confinement; heat conduction; plasma temperature; cameras
Citation Formats
Hollmann, E. M., Commaux, N., Eidietis, N. W., Lasnier, C. J., Moyer, R. A., Parks, P. B., and Shiraki, D. Mitigation of upward and downward vertical displacement event heat loads with upper or lower massive gas injection in DIII-D. United States: N. p., 2015.
Web. doi:10.1063/1.4932999.
Hollmann, E. M., Commaux, N., Eidietis, N. W., Lasnier, C. J., Moyer, R. A., Parks, P. B., & Shiraki, D. Mitigation of upward and downward vertical displacement event heat loads with upper or lower massive gas injection in DIII-D. United States. https://doi.org/10.1063/1.4932999
Hollmann, E. M., Commaux, N., Eidietis, N. W., Lasnier, C. J., Moyer, R. A., Parks, P. B., and Shiraki, D. Mon .
"Mitigation of upward and downward vertical displacement event heat loads with upper or lower massive gas injection in DIII-D". United States. https://doi.org/10.1063/1.4932999. https://www.osti.gov/servlets/purl/1305836.
@article{osti_1305836,
title = {Mitigation of upward and downward vertical displacement event heat loads with upper or lower massive gas injection in DIII-D},
author = {Hollmann, E. M. and Commaux, N. and Eidietis, N. W. and Lasnier, C. J. and Moyer, R. A. and Parks, P. B. and Shiraki, D.},
abstractNote = {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.},
doi = {10.1063/1.4932999},
journal = {Physics of Plasmas},
number = 10,
volume = 22,
place = {United States},
year = {Mon Oct 12 00:00:00 EDT 2015},
month = {Mon Oct 12 00:00:00 EDT 2015}
}
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Works referenced in this record:
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Measurements of impurity and heat dynamics during noble gas jet-initiated fast plasma shutdown for disruption mitigation in DIII-D
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Works referencing / citing this record:
Measurement of toroidal variation in conducted heat loads in locked mode induced disruptions on DIII-D
journal, October 2018
- Hollmann, E. M.; Commaux, N.; Eidietis, N. W.
- Physics of Plasmas, Vol. 25, Issue 10
Injection of multiple shattered pellets for disruption mitigation in DIII-D
journal, September 2019
- Herfindal, J. L.; Shiraki, D.; Baylor, L. R.
- Nuclear Fusion, Vol. 59, Issue 10