磁共振励磁过程中失超的风险因素分析

      Magnet Quench Factors in Ramping-up Procedure

      • 摘要: 励磁是在控制励磁回路线阻、励磁电压、磁体电极温度、磁体压力、磁体内部温度等必要因素的条件下,向磁共振超导线圈内部逐步注入要求的工作电流的过程。此过程中由于磁体电极温度、磁体内部温度、压力,超导线圈电流等影响磁体稳定性的因素处于不断变化过程中,因此是发生磁体失超的主要阶段之一。该研究以西门子磁共振励磁原理为例,结合实际励磁数据,其中包括同一台西门子Verio磁共振7年励磁数据,以说明励磁过程中的影响因素,为减少磁共振励磁过程中失超提供依据和数据支撑。

         

        Abstract: Ramping-up is the magnet current injection procedure which is under the control of resistance, voltage, current lead temperature, magnet pressure, temperature and so on. In this procedure, the factors related to the stability of the magnet such as, magnet temperature, pressure and currents are constantly changing. This procedure is the main step which the magnet-quench occurs in. This study uses the data collected during 7 years and SIMENS MRI ramping-up theory, in order to help engineers understand the key factors to reduce the magnet quench during the ramping up procedure.

         

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