The influence of circular trim coil current variation on vertical beam behaviour is also determined experimentally. 同時也測量了束流引出區環形補償線圈中的勵磁電流變化對引出束流性能的影響。
An ambient field aids the magnetization from the exciting current. 背景場加強了激勵電流的磁化強度。
The curve of the relation between the amplitude of the ultrasonic wave and the excitation current of the electromagnetic field was obtained by experiments. 為此設計了確定最佳磁化強的試驗方案，通過試驗得到超聲波幅值隨電磁場激勵電流的變化曲線。
