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Thermal Analyses of MICE SC Magnets during Charging and Discharging Processes

Author: MouYongBin
Tutor: WangLi
School: Harbin Institute of Technology
Course: Refrigeration and Cryogenic Engineering
Keywords: Superconducting magnet Charging and discharging AC loss Thermal analysis Numerical simulation Experimental measurement
CLC: O511.4
Type: Master's thesis
Year: 2008
Downloads: 34
Quote: 0
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Abstract


The Muon Ionization Cooling Experiment (MICE) will provide the first demonstration of the muon ionization cooling technique, which is critical to the success of a future muon -based accelerator system. The superconducting coupling magnet, which is one of the key components in MICE has the largest dimension, self-inductance and storage energy over MICE superconducting magnet. The MICE coupling magnet is to be indirectly cooled by two stage cryocoolers, which has simpler cooling structure and lower magnetic stability than traditional immerged LHe cooling method. This thesis preliminarily analyzed the AC losses and their influence on magnetic stability of three superconducting solenoid magnet, which are designed and fabricated by ICST/HIT for MICE.At first, this thesis discussed the Ic-Tc-Bc characteristics of NbTi superconductor wire used for MICE superconducting coupling magnet. The different charging and discharging modes for superconducting solenoid magnets are analyzed using equivalent circuit. The charging and discharging mode for three superconducting magnets are separately optimized, and the charging and discharging modes needed shortest time are determined.Based on the analysis of AC loss calculation methods for superconducting magnet, this thesis has discussed the influence of magnetic penetration effect on hysteresis losses, and also analyzed the influence of hysteresis losses, coupling losses and transmission effect on the AC loss of superconducting magnet. The eddy current loss distributions of magnet mandrel under different current changing ratio have been gotten using ANSYS. The results have good consistency with the engineering calculation results before.Using FEA method, the transient temperature distribution of three superconducting magnets under different charging and discharging mode are simulated, and the variation characteristics of AC losses for three superconducting magnets are obtained also. Base on the analysis of minimum temperature margin, the quench possibility of three superconducting magnets during charging and discharging process are discussed. The analysis results can provide theoretical basis for charging and discharging mode, cooling system design and stable operation for MICE superconducting coupling magnet and two prototype magnet.At last, the experiment projects to measure AC losses using both electrometric and calorimetric methods are designed. The advantages and disadvantages are compared for the two measurement methods, and the points for attention during experiment are summarized in this thesis also.

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CLC: > Mathematical sciences and chemical > Physics > Low Temperature Physics > Superconductivity > Superconductors nature
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