Conveners
Thu-Mo-Posters Session 3.5: Fe-pnictides, HTS bulk, Metals and Insulators
- Carlo Ferdeghini (CNR)
Dr
Huihui Yang
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
10/07/2014, 10:30
M-10: Metallic and composite materials processing and properties
Poster presentation (105min)
Developing a systematic and thorough framework for the TF jacket is of profound repercussions to ITER. Here, we present an extensively observation and analysis of structural transformation for TF jacket after tensile test at cryogenic temperature with a phase transformation from γ-austenitic phase to α'-martensite. We found with decreasing the temperature, less external energy is needed to...
Mr
Hidemasa Ozeki
(Japan Atomic Energy Agency)
10/07/2014, 10:30
M-10: Metallic and composite materials processing and properties
Poster presentation (105min)
The Japan Atomic Energy Agency (JAEA) is responsible for procurement of the central solenoid (CS) conductor for ITER. The CS conductor is assembled by pulling Nb3Sn superconductor cable into circular-in-square jacket whose material is JK2LB high manganese stainless steel developed by JAEA, and then heat treatment is carried out. In the recent study of Nb3Sn strand, heat treatment pattern...
Tetsuo Oka
(Niigata University)
10/07/2014, 10:30
M-06: HTS Bulk
Poster presentation (105min)
A unique experimental attempt aiming to obtain the uniform magnetic field space which is available for NMR/MRI equipments has been carried out with use of the HTS bulk magnets. The magnetic poles were activated as N 1.8 T and S 1.4 T at 30 K by the pulsed magnetic fields up to 7 T, and settled face-to-face with the gap less than 70 mm. Since the magnetic field yielding at the surface of the...
Dr
Akira Murakami
(Ichinoseki National College of Technology)
10/07/2014, 10:30
M-06: HTS Bulk
Poster presentation (105min)
Since grain boundaries of MgB2 bulk superconductors are not weak-links, uniform distribution of trapped magnetic field is easy to obtain even for large bulk samples. Bulk superconductors are subjected to electromagnetic force and thermal stress in the superconducting devices. Thus, understanding of the mechanical properties is indispensable. However, the mechanical properties of MgB2 bulks...
Martin Nikolo
(Saint Louis University)
10/07/2014, 10:30
M-07: Pnictides and new superconducting materials
Poster presentation (105min)
Thermally assisted flux flow (TAFF) based on magneto-resistivity and ac susceptibility measurements is studied in a Ba(Fe0.91Co0.09)2As2 (Tc = 25.3 K) sample in magnetic fields up to 18 T. In addition to the upper critical field µ0Hc2 and the coherence length ξ(0), the flux flow activation energy U(T,H) has also been determined. The resistive transition width is proportional to µ0H, in...
Martin Nikolo
(S)
10/07/2014, 10:30
M-07: Pnictides and new superconducting materials
Poster presentation (105min)
Thermally assisted flux flow (TAFF) is studied in bulk Ba(Fe0.95 Ni0.05)2As2 (Tc = 20.4 K), Ba(Fe0.94 Ni0.06)2As2 (Tc = 18.5 K) superconductors by transport measurements in magnetic fields up to 18 T. In addition, the upper critical field μ0Hc2(0) and the coherence length ζ(0) are determined. The data is analyzed in the context of the widely accepted Anderson-Kim model and Fischer model. The...
Anatoly Krivykh
(Kurchatov Institute, Russia)
10/07/2014, 10:30
M-10: Metallic and composite materials processing and properties
Poster presentation (105min)
Uniaxial tensile tests of 316LN-IG stainless steel specimens cut along the axis of tubes were performed in liquid and gaseous helium below 8 K. Time dependences of stress, temperature, strain and strain induced magnetization normal to the specimen surface were studied. A complicated behavior of the local deformation near slip bands observed earlier [Tech. Phys. 57 (2012) 1562] was verified,...
Prof.
Laifeng Li
(Technical Institute of Physics and Chemistry)
10/07/2014, 10:30
M-10: Metallic and composite materials processing and properties
Poster presentation (105min)
The 316L stainless steel (SS) has been used as the conductor jacket of ITER poloidal field (PF) coil. The mechanical properties of the conductor jacket should be investigated at liquid helium temperature. In this work, tension, plain strain fracture toughness, and fatigue crack growth rate were studied at low temperature with specimens machined from the final state of the conductor jacket,...
Ms
Lingxue Jin
(KAIST)
10/07/2014, 10:30
M-11: Insulation and impregnation materials
Poster presentation (105min)
Thermal insulation plays an important role on energy conservation. Powder insulation method is widely used in structure and cryogenic systems, such as transportation and storage tank of cryogenic liquefied gases. Powder insulation layer is constructed by small particle powder with light weight and some residual gas with high porosity. So far, many experiments have been done to test the thermal...
Dr
Takao Ohmori
(Teikyo University)
10/07/2014, 10:30
M-11: Insulation and impregnation materials
Poster presentation (105min)
A vertical cylindrical calorimeter to measure the thermal performance of multilayer insulation (MLI) has been developed. Two concentric OFHC cold drums are fabricated by the sample MLI blankets, and are cooled by two-stage Gifford-McMahon cryocooler. As the cold drums are vertically supported, the layer density of the MLI sample around the drum is free from the gravity. Inner cold drum is...
Masaru Tomita
(Railway Technical Research Institute)
10/07/2014, 10:30
M-06: HTS Bulk
Poster presentation (105min)
Rare-earth barium-copper-oxide (REBCO) bulk superconductors with Tc > 90 K have high critical current density (Jc) under up to high magnetic fields, so that REBCO bulks have potential to generate a strong magnetic field in compact size. In the present study, we fabricated ring-shaped bulk annuli and evaluated trapped field property for NMR application.
The disk-shaped bulks were processed...
