| 1 | Design Features and Commissioning of the Versatile Experiment Spherical Torus (VEST) at Seoul National University显示文摘A new spherical torus called VEST (Versatile Experiment Spherical Torus) is designed,constructed and successfully commissioned at Seoul National University.A unique design feature of the VEST is two partial solenoid coils installed at both vertical ends of a center stack,which can provide sufficient magnetic fluxes to initiate tokamak plasmas while keeping a low aspect ratio configuration in the central region.According to initial double null merging start-up scenario using the partial solenoid coils,appropriate power supplies for driving a toroidal field coil,outer poloidal field coils,and the partial solenoid coils are fabricated and successfully commissioned.For reliable start-up,a preionization system with two cost-effective homemade magnetron power supplies is also prepared.In addition,magnetic and spectroscopic diagnostics with appropriate data acquisition and control systems are well prepared for initial operation of the device.The VEST is ready for tokamak plasma operation by completing and commissioning most of the designed components. | K.J.CHUNG Y.H.AN B.K.JUNG H.Y.LEE C.SUNG Y.S.NA T.S.HAHM Y.S.HWANG | 2013 | Plasma Science and Technology2013，15，3： | 1 |
| 2 | Hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys显示文摘Heterostructured eutectic high-entropy alloys(EHEAs)have attracted significant attention owing to their novel properties,such as balanced combinations of strength and fracture toughness.However,the toughening/strengthening mechanisms of these EHEAs have not been thoroughly investigated.In this study,we developed a series of dual-phase Al_((18–2x))Co_(30)Cr_((11+x))Fe_((11+x))Ni_(3)0(x=-1,0,1)eutectic and neareutectic HEAs containing face-centered cubic(FCC)and body-centered cubic(BCC)phases.Despite the high amount of BCC,which is referred to as the brittle phase,newly developed EHEAs exhibited superior fracture toughness.Interestingly,we discovered that a fully eutectic HEA exhibited further improvements in both yield stress and fracture toughness,outperforming our off-eutectic and other previously reported HEAs.By combining experiments and theoretical models,we demonstrated that the synergistic increase in both strength and toughness in our fully eutectic HEA was derived from the high hetero-deformationinduced(HDI)strengthening/toughening associated with a high misorientation angle at the grain/phase boundaries. | D.H.Chung J.Lee Q.F.He Y.K.Kim K.R.Lim H.S.Kim Y.Yang Y.S.Na | 2023 | Journal of Materials Science & Technology2023，，15： | 0 |
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