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-  2019 

变速旋转带电体的磁偶极辐射阻尼力矩公式与算例 The Damping Torque Formula and Its Examples of Magnetic-Dipole Radiation for Rotational Charged Bodies with Changing Angular Velocity

Keywords: 旋转带电体,电矩张量,磁偶极辐射,辐射功率,辐射阻尼力矩

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Abstract:

通过电磁场矢势的远场多极矩展开理论,引入旋转带电体的一个本体电矩张量以计算其磁矩,推导了定轴变角速转动带电体的磁偶极辐射功率及其受到的辐射阻尼力矩公式。研究表明,忽略延迟效应,在非相对论远场情形以及准周期平均意义下,变速旋转带电体的辐射阻尼力矩与其角速度的四阶导数有关;给出了若干特殊形状变速旋转带电体的磁距、磁偶极辐射功率和辐射阻尼力矩的具体算例;另外,以带电简谐转子为例,利用微扰法讨论了辐射阻尼力矩对其转动的影响

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