超导磁体大梯度强磁场中抗磁性物质表观重力分析

Analysis on simulated gravity of diamagnetic substance in large gradient high magnetic field based on superconducting magnet

目的超导磁体产生的大梯度强磁场(large gradient high magnetic field,LGHMF)可实现变重力环境的模拟,其中利用超导磁体实现的抗磁悬浮技术是目前悬浮生物体、水等抗磁性物质的主要手段。为准确定位超导磁体中的抗磁悬浮或其他表观重力水平位点,建立了大梯度强磁场中抗磁性物质(尤其针对于生物体)的表观重力水平分析模型,可用于磁生物学、电磁医疗领域的研究。方法模型通过采集磁体内磁感应强度数据,应用中心差分算法计算场强梯度积,并计算出抗磁性物质的表观重力数值。此外,通过MATLAB软件的图形模块进行了实际表观重力水平整体分布仿真,同时结合软件数据拟合磁体纵向方向的连续表观重力水平函数。结果模型可准确分析出物质在磁场内各处的受力情况及磁体内所有表观重力水平的位点。仿真很好地反映出超导磁体强磁模拟重力环境下抗磁性物质表观重力水平的变化趋势,与原始出厂时的表观重力水平理论分布基本一致。结论该模型对磁体设备的二次开发及磁体实验的设计和分析有重要意义。

Objective Superconducting magnet can generate large gradient high magnetic field （LGHMF） which can simulate different gravity environment and is the primary means of suspension for diamagnetism substance like water,bio-organism and other anti-magnetic materials. In order to accurately locate the sites of anti-mag levitation or other simulated gravity level in superconducting magnet, we established simulated gravity level analysis model of diamagnetism substance （especially for bio-organism） in LGHMF, which should be a great help in magnetobiology and electromagnetic medical field research field. Methods This model calculated magnetic field gradient product and finally got data of diamagnetism substance＇ s simulated gravity by collecting the data of magnetic intensity and applying central differencing algorithm. Meanwhile this model combined with MATLAB software to fit continuous simulated gravity level function on the magnet longitudinal direction, and make numerical simulation by graphics module of the software. Results This model accurately calculated force analysis of substance and sites of all simulated gravity level in a magnetic field. Simulation could appropriately reflect simulated gravity level trends of diamagnetism substance in magneto-gravitational environment. Conclusions This mathematic model is really important for secondary development of magnet equipment and the design and analysis of magnetic biology experiment.