The paper overviews the one-of-a-kind MaPLE loop at UCLA and presents recent experimental activities, including the development and testing of high-temperature PbLi flow diagnostics and experiments that have been performed since the first loop operation in 2011. The primary goal of MHD experiments at UCLA using the liquid metal flow facility called MaPLE (Magnetohydrodynamic PbLi Experiment) is to address important MHD effects, heat transfer and flow materials interactions in blanket-relevant conditions. Abstract: Experiments on magnetohydrodynamic (MHD) flows are critical to understanding complex flow phenomena in ducts of liquid metal blankets, in particular those that utilize eutectic alloy lead–lithium as breeder/coolant, such as self-cooled, dual-coolant and helium-cooled lead–lithium blanket concepts. • The most important MHD experiments carried out since the first loop operation in 2011 are summarized. • We present the progress achieved in development and testing of high-temperature PbLi flow diagnostics. Highlights: • The paper overviews the MaPLE facility at UCLA: one-of-a-few PbLi MHD loop in the world. MHD PbLi experiments in MaPLE loop at UCLAĬourtessole, C. ![]() The load transfer of forces and moments is considered as a stress distribution resisted by the coils, support structures, wedges, and the structural shell A stress analysis is presented, based upon calculated hoop tension, centering force, and overturning moment, treating these as a combination of static loads and considering that the periodic nature of the loading causes little amplification. The coils are driven by a 12-MJ capacitor bank which is allowed to ring in order to aid the reversal of magnetic field. The requirement for highly uniform fields, with spatial ripple <0.2% leads to a design with 72 equally spaced circular TF coils, located at minor radius 0.6 meters, carrying a maximum current of 9.0 MA. ZT-H is designed with major radius 2.15 meters, minor radius 0.40 meters, and a peak toroidal magnetic field of 0.85 Tesla. The engineering design of the toroidal magnetic field (TF) system for a 2- MA Reversed-Field Pinch experiment (ZT-H) is described. Toroidal magnetic field system for a 2- MA reversed-field pinch experiment The elastic measurements were performed at the Austrian triple axis spectrometer VALSE located at the Laboratoire Leon Brillouin (LLB) in Saclay (F) the inelastic measurements were performed at the spectrometers IN3 and INS of the Institute Laue Langevin (ILL) in Grenoble (F). Their intensity varied in accordance to the volume fraction of the phases but vanished on changing wavelength. In the temperature region of coexistence of dhcp and fcc phase diffuse satellites arose near the (111)fcc Bragg peak (which is equivalent to the (00.2)dhcp peak). This was possible because the system shows a wide temperature hysteresis at the two phase transitions. Diffuse neutron scattering revealed a lattice parameter shift between the dhcp and fcc phase of âˆ❀.4 % measured at the same temperature. Lattice-parameter scans were performed through the whole temperature range. ![]() In all of the measured phonon branches anomalies were neither found near the hcp-dhcp phase transition nor going through the dhcp-fcc transition. The lattice dynamics of Co- 0.85at%Fe was investigated by the means of inelastic neutron scattering at a series of temperatures up to 750K in order to understand the two martensitic phase transitions of this system. International Nuclear Information System (INIS)Ĭo- 0.85at%Fe shows the two martensitic phase transitions hcp-dhcp and dhcp-fcc. Martensitic phase transitions in Co- 0.85 at % Fe
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