进行该项治疗的患者在头部置有一个线圈，这个线圈通过电磁感应在一个变化的磁场中激活弱电流。

Patients undergoing this treatment have a coil placed on their head which uses electromagnetic induction to activate weak electric currents via a changing magnetic field.

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当待加工部件在设备里就位后，线圈在其中产生感应磁场。

When the component to be worked is placed next to such a machine, the coil induces in it a corresponding field.

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本文从第一性原理出发，计算了充磁线圈产生的磁场，脉冲充磁的超导圆盘中的感应电流密度和俘获场分布。

The distribution of the induced current density and the profile of the trapped magnetic field in a superconducting disk magnetized by magnetic pulses are calculated from first principles.

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