This report discusses the AC losses in the MICE channel magnets during magnet charging and discharging. This report talks about the three types of AC losses in the MICE magnets; the hysteretic AC loss in the superconductor, the coupling AC loss in the superconductor and the eddy current AC loss in the magnet mandrel and support structure. AC losses increase the heat load at 4 K. The added heat load increases the temperature of the second stage of the cooler. In addition, AC loss contributes to the temperature rise between the second stage cold head and the high field point of the magnet, which is usually close to the magnet hot spot. These are the curses of AC loss in the MICE magnet that can limit the rate at which the magnet can be charge or discharged. If one is willing to allow some of the helium that is around the magnet to boil away during a magnet charge or discharge, AC losses can become a blessing. The boil off helium from the AC losses can be used to cool the upper end of the HTS leads and the surrounding shield. The AC losses are presented for all three types of MICE magnets. The AC loss temperature drops within the coupling magnet are presented as an example of how both the curse and blessing of the AC losses can be combined.
In order to reveal abnormal shaped aluminum alloy law of needle piercing extrusion formation, setting the missile empennage as an example, this paper adopts the non-linear finite element to conduct the three-dimensional thermal simulation of abnormal shaped material law of needle piercing extrusion formation process and analyses systematically the influence of process law on temperature change, additional tensile stress and forming load. The results show that, in the range of low-speed extrusion, the billet's highest peak temperature shows a decreasing trend, and with the extrusion speed increasing, the decrease of highest peak temperature decreases, while the axial extra tensile stress on the mouth of model increases accordingly; the axis part of the mold's mouth is a high-temperature zone in the forming process, and with the axis center distance increasing, the temperature decreases gradually; and with the pressing reduction's increase, the gradient of temperature decreasing trend slows down gradually. This provides a theoretical basis to technical design of abnormal shaped material needle piercing extrusion formation and the metal distortion flow control. K e y w o r d s : mandrel extrusion, aluminum alloys profile, coupled thermal-mechanical numerical simulation
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