Shattered pellet penetration in low and high energy plasmas on DIII-D

Raman, R.; Sweeney, Ryan; Moyer, Richard A.; Eidietis, Nicholas W.; Shiraki, Daisuke; Herfindal, Jeffrey; Sachdev, Jai; Hollmann, Eric M.; Jardin, Stephen C.; Baylor, Larry R.; Wilcox, R. S.; Carlstrom, Tom N.; Osborne, Tom H.; Eldon, David; Menard, Jonathan E.; Lunsford, R.; Grierson, Brian A.

doi:10.1088/1741-4326/ab686f

Shattered pellet penetration in low and high energy plasmas on DIII-D

Journal Article · Sun Feb 09 23:00:00 EST 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab686f· OSTI ID:1595777

^[1]; ^[2]; Moyer, Richard A. ^[3]; ^[4]; Shiraki, Daisuke ^[5]; ^[5]; ^[6]; Hollmann, Eric M. ^[3]; ^[6]; Baylor, Larry R. ^[5]; Wilcox, R. S. ^[5]; Carlstrom, Tom N. ^[3]; Osborne, Tom H. ^[3]; Eldon, David ^[3]; ^[6]; ^[6]; ^[6]

Univ. of Washington, Seattle, WA (United States)
ITER Organization (France); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. of California, La Jolla, CA (United States)
General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Shattered Pellet Injection (SPI) was previously adopted as the baseline disruption mitigation system for ITER, as the radiative payload penetration into DIII-D plasmas from SPI is superior to those using the Massive Gas Injection (MGI) method. Because of the substantial differences in the energy content of ITER plasma and those in present experiments, reliable 3d MHD modeling, benchmarked against present experiments is needed to project to ITER plasmas. On account of these needs, the depth of SPI fragment penetration in DIII-D plasmas was investigated by injecting SPI into two discharges with vastly different energy content and pedestal height. 400 Torr-L pure Ne fragmented pellets at a velocity of about 200 m s^-1 were injected into a 0.2 MJ L-mode discharge and a 2 MJ super H-mode discharge. Results show deep penetration of SPI fragments into low-energy plasmas in DIII-D. SPI fragment penetration is reduced as the plasma energy content increases, with some discharges exhibiting penetration that is confined to the outer regions of the plasma. The injected SPI fragments are also spread out over a distance of about 20 cm, which results in some fragments arriving near the end of or after the thermal quench is over.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States); Univ. of Washington, Seattle, WA (United States)

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

OSTI ID:: 1595777

Alternate ID(s):: OSTI ID: 1648999
OSTI ID: 1696782
OSTI ID: 1599130
OSTI ID: 23013536

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 3 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Shattered pellet penetration in low and high energy plasmas on DIII-D

Dataset · Thu Nov 04 00:00:00 EDT 2021 · OSTI ID:1886682

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DIII-D
ITER
SPI
disruption
mitigation
thermal quench

Shattered pellet penetration in low and high energy plasmas on DIII-D

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