Results 1 to 10 of about 143 (121)

MHD modeling of shattered pellet injection in JET

Nuclear Fusion, 2023
Nonlinear 3D MHD simulations of shattered-pellet injection (SPI) in JET show prototypical SPI-driven disruptions using the M3D-C1 and NIMROD extended-MHD codes.
J. McClenaghan, B.C. Lyons, C.C. Kim, C. Akçay, N. Eidietis, L.L. Lao, R.M. Sweeney, B. Stein-Lubrano, U. Sheikh, N. Hawkes, G. Szepesi, JET Contributors   +11 more
doaj   +1 more source

Density and temperature profiles after low-Z and high-Z shattered pellet injections on DIII-D

Nuclear Fusion, 2023
In this work we utilize the recently upgraded Thomson scattering diagnostic to resolve density and temperature plasma profiles after pure deuterium and mixed neon/deuterium shattered pellet injections (SPIs) on DIII-D.
A. Lvovskiy, A. Matsuyama, T. O’Gorman, D. Shiraki, J.L. Herfindal, E.M. Hollmann, C. Marini, R. Boivin, N.W. Eidietis, M. Lehnen   +9 more
doaj   +1 more source

Collisional-radiative simulation of impurity assimilation, radiative collapse and MHD dynamics after ITER shattered pellet injection

Nuclear Fusion, 2023
Recent studies suggest significant time delay between the Shattered Pellet Injection (SPI) fragment arrival and the temperature radiative collapse could exist in ITER, depending on the impurity assimilation and the plasma thermal reservoir. Hence in some
D. Hu, E. Nardon, F.J. Artola, M. Lehnen, D. Bonfiglio, M. Hoelzl, G.T.A. Huijsmans, S.-J. Lee, the JOREK Team   +8 more
doaj   +1 more source

Thermal quench induced by a composite pellet-produced plasmoid

Nuclear Fusion, 2023
Injecting shattered pellets is the critical concept of the envisaged ITER disruption mitigation system (DMS). Rapid deposition of large amounts of material should presumably result in controlled cooling of the entire plasma.
Pavel Aleynikov, Alistair M. Arnold, Boris N. Breizman, Per Helander, Aleksey Runov   +4 more
doaj   +1 more source

Development of the upgraded single crystal dispersion interferometer (SCDI-U) and its first measurements of the line integrated electron densities in KSTAR during shattered pellet injections

Nuclear Fusion, 2023
Dispersion interferometers (DI) are widely used to measure line integrated electron densities in many fusion devices. A recent development of a heterodyne single crystal DI (SCDI) with a laser wavelength of 1064   nm (Lee et al 2021 Rev. Sci. Instrum. 92
Dong-Geun Lee, Kwan Chul Lee, J.-W. Juhn, Jae-seok Lee, Jayhyun Kim, SooHwan Park, Michael Lehnen, Yong-Hwa Park, Jae-Hak Jeong, Jaebeom Yim, Y.-C. Ghim   +10 more
doaj   +1 more source

First results of Ne shattered pellet injection for mitigating plasma disruption with full metal wall in EAST tokamak

Nuclear Fusion, 2023
Disruption mitigation poses a significant and unresolved challenge for ITER and future fusion reactor devices. To mitigate the effect of plasma disruption, a Shattered Pellet Injection (SPI) system has been developed and the first rapid shutdown ...
J.S. Yuan, G.Z. Zuo, S.B. Zhao, L. Li, H.D. Zhuang, L. Zeng, S.T. Mao, Y.M. Duan, D.L. Chen, L.Q. Xu, J.L. Hou, M. Huang, Y. Chen, J.S. Hu   +13 more
doaj   +1 more source

The mechanism of the global vertical force reduction in disruptions mitigated by massive material injection

Nuclear Fusion, 2023
Disruptions lead to a rapid loss of thermal and magnetic energy and can cause large heat loads, mechanical forces, and the excitation of a beam of relativistic runaway electrons.
N. Schwarz, F.J. Artola, F. Vannini, M. Hoelzl, M. Bernert, A. Bock, T. Driessen, M. Dunne, L. Giannone, P. Heinrich, P. de Marné, G. Papp, G. Pautasso, S. Gerasimov, the ASDEX Upgrade Team, JET Contributors, Team the JOREK   +16 more
doaj   +1 more source

Radiative heat load distribution on the EU-DEMO first wall due to mitigated disruptions

Nuclear Materials and Energy, 2020
The EU-DEMO First Wall (FW) will be a relatively thin structure. In order not to damage this layer, heat loads distributed onto the wall should be carefully controlled.
M. Moscheni, M. Carr, S. Dulla, F. Maviglia, A. Meakins, G.F. Nallo, F. Subba, R. Zanino   +7 more
doaj   +1 more source

CLRe: A Synergistic Dual‐Engine Framework for One‐Step Retrosynthesis Prediction

Advanced Science, EarlyView.
CLRe uses a contrastive difficulty score to order pretrained seq2seq fine‐tuning for retrosynthesis. Reaction embeddings define the ranking score, and a cumulative easy‐to‐hard schedule expands from the easiest subset to the full training set while earlier examples remain active.
Tianhao Su, Xitao Wang, Musen Li, Guanhua Qin, Shunbo Hu, Tong‐Yi Zhang   +5 more
wiley   +1 more source

Protocol for Reconstituting Adaptor‐Mediated Activation of Full‐Length Kinesin‐1

Cytoskeleton, EarlyView.
ABSTRACT Kinesin‐1 is a member of the kinesin superfamily that plays an essential role in intracellular cargo transport. In the absence of cargo, Kinesin‐1 exhibits low motor activity due to autoinhibition. Multiple studies have demonstrated that adaptor proteins, which link cargos to Kinesin‐1, can activate Kinesin‐1 by releasing the autoinhibition ...
Haruka Masumoto, Kyoko Chiba
wiley   +1 more source