采用脉冲悬丝法测量强流加速腔聚焦场磁轴

PULSED WIRE MAGNETIC FIELD ALIGNMENT MEASUREMENTS ON A HIGH CURRENT INDUCTION CELL

介绍了利用脉冲悬丝法校正、测量加速腔磁轴，以及对１０ＭｅＶＬＩＡ束输运系统中４０ｃｍ长聚焦线圈磁轴偏差的测量，详细描述了实验装置和实验方法。从测得的电压波形可区分出磁轴的倾斜与偏移，并可区分出倾料与偏移的方向，在聚焦线圈轴向磁场最强为０．０７２Ｔ的条件下，通过多次实验改变悬丝电流从０．３Ａ到３．８Ａ，并改变电流脉冲宽度从０．３ｍｓ到１．５ｍｓ，测出了４０ｃｍ聚焦线圈磁轴的偏差，并给出了磁轴偏差分布的对应波形。测试灵敏度估计为磁轴倾斜１ｍｒａｄ，偏移０．

This paper presents our research work on the pulsed taut-wire measurements of the magnetic alignment of the high current induction-cell. A fine taut wire carrying a pulse current was put in the solenoid magnet along the mechanical axis of the solenoid. Current pulse 0.3ms long are produced by a high current pulser through the wire, and observing the Lorentz force on the wire. A detector placed at z=z d outside the region of the solenoid magnetic field. The detector is an electric optical interruptor operated on edge so that the transmitted light is sensitive to the wire position. The signal from the phototransistor is amplified and digitized by digital camera DS301. If the magnetic axis is an offset or a tilt of the mechanical axis of the solenoid, the wave patten produced by these errors are different from that produced by the correct one. The amplitude of the waveforms are directly proportional to the second integral of the transvers magnetic fields. In our experiments we changed the current pulse amplitude from 0.3A to 3.8A, and is width from 0.3ms to 1.5ms, the centering error of the wire is ±0.05mm. The tilt, the offest and their direction can be distinguished from the waveform. The experimental sensitivity of tilt we estimated is lmrad. Lastly to differentiate the waveform two times, we can get some information about the solenoid magnitic field distribution.