skip to main content

DOE PAGESDOE PAGES

Title: Modeling of rapid shutdown in the DIII-D tokamak by core deposition of high-Z material

MHD modeling of shell-pellet injection for disruption mitigation is carried out under the assumption of idealized delivery of the radiating payload to the core, neglecting the physics of shell ablation. The shell pellet method is designed to produce an inside-out thermal quench in which core thermal heat is radiated while outer flux surfaces remain intact, protecting the divertor from large conducted heat loads. In the simulation, good outer surfaces remain until the thermal quench is nearly complete, and a high radiated energy fraction is achieved. As a result, when the outermost surfaces are destroyed, runaway electron test orbits indicate that the rate of runaway electron loss is very fast compared with prior massive gas injection simulations, which is attributed to the very different current profile evolution that occurs with central cooling.
Authors:
ORCiD logo [1] ; ORCiD logo [2]
  1. Univ. of California, San Diego, CA (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Grant/Contract Number:
FC02-04ER54698; AC02-05CH11231; FG02-95ER54309; SC0015499; SC0016420
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 6; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1374044
Alternate Identifier(s):
OSTI ID: 1365433

Izzo, Valerie A., and Parks, Paul B.. Modeling of rapid shutdown in the DIII-D tokamak by core deposition of high-Z material. United States: N. p., Web. doi:10.1063/1.4990447.
Izzo, Valerie A., & Parks, Paul B.. Modeling of rapid shutdown in the DIII-D tokamak by core deposition of high-Z material. United States. doi:10.1063/1.4990447.
Izzo, Valerie A., and Parks, Paul B.. 2017. "Modeling of rapid shutdown in the DIII-D tokamak by core deposition of high-Z material". United States. doi:10.1063/1.4990447. https://www.osti.gov/servlets/purl/1374044.
@article{osti_1374044,
title = {Modeling of rapid shutdown in the DIII-D tokamak by core deposition of high-Z material},
author = {Izzo, Valerie A. and Parks, Paul B.},
abstractNote = {MHD modeling of shell-pellet injection for disruption mitigation is carried out under the assumption of idealized delivery of the radiating payload to the core, neglecting the physics of shell ablation. The shell pellet method is designed to produce an inside-out thermal quench in which core thermal heat is radiated while outer flux surfaces remain intact, protecting the divertor from large conducted heat loads. In the simulation, good outer surfaces remain until the thermal quench is nearly complete, and a high radiated energy fraction is achieved. As a result, when the outermost surfaces are destroyed, runaway electron test orbits indicate that the rate of runaway electron loss is very fast compared with prior massive gas injection simulations, which is attributed to the very different current profile evolution that occurs with central cooling.},
doi = {10.1063/1.4990447},
journal = {Physics of Plasmas},
number = 6,
volume = 24,
place = {United States},
year = {2017},
month = {6}
}