Magnet Cooling Model Of The 70T Strong Pulse Magnetic Field In Low Temperature And Experiment Research

The strong pulse magnetic field experimental device mainly offers the environment of strong magnetic field for physics experiment under various kinds of extreme conditions, its low-temperature system including the magnet cooling system and the experiment sample cooling system. This text carries research mainly on the part of magnet cooling system.The intensity of magnetic field of the magnet used in the device is up to 70T, pulse voltage guided into magnet is above 20,000 volts, pulse width is in milliseconds. During pulse, the small magnet will gather a large amount of energy within extremely short time, it will make magnet temperature rise rapidly, after the pulse the magnet must be cooled to the primitive low temperature in order to meet the next pulse. The hot load of magnet is intermittent, so the cooling of magnet can meet the demands to adopt the comparatively economic liquid nitrogen bath cooling way.This text carries on describe in mathematics and simplify to the physical model of magnet, set up the mathematics model of magnet cooling, use the analytic approach of number value to solve the mathematics model, carries on the numerical simulation and emulation to the cooling course of magnet, have got the temperature field, curve of drop in the temperature and cooling time needed of magnet. designs and makes the subject parts of two sets of the strong pulses magnetic field experimental device , verifies the exactness of the theory model through the experiment , and put forward the improvement suggestion to magnet making through an analysis of imitating and experimental result.Theory analysis and experimental result show that the insulation demands of magnet cause its heat dissipation condition to be bad, so the cooling time of pulse magnet is general relatively long, it generally takes about 6 to 8 hours. But the temperatures of the magnet layers that insaid and outsaid the most have been nearly maintaining under 80K all the time, and the magnet layer that insaid the most have the greatest rate of change of temperature. the cooling course of the magnet demonstrates the trend that slow after being fast first, it depends on the structure of the magnet itself,but not the difference in conducts heat, the curves of drop in the temperature of the magnet strengthened layers have peak values , their temperature change are to fall after rising. The magnet has good ability that to even up temperatures, especially that temperatures are unanimous basically in the conductor layers everywhere in the same moment of the cooling course. In order to improve the heat dissipation condition of magnet, we can consider partly digging the reinforcement board which is used to clamp the magnet, let the liquid nitrogen exposed to magnet in order to improve scattered thermal efficiency better.