结合超导磁体的偏置场产生高脉冲场的磁体系统的新设计理念

J. Pitel , H. Jones
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引用次数: 5

摘要

提出了一种新的轴对称磁体系统的设计概念,该系统产生叠加在超导磁体偏置磁场上的超高脉冲磁场。脉冲磁体由两个同轴线圈组成,它们以相反的方向缠绕。两个脉冲线圈的几何结构,即工作线圈(内线圈)和补偿线圈(外线圈)被设计成这样一种方式,即小脉冲磁体和外部超导磁体之间的相互耦合几乎为零。当脉冲磁体通电时,这种结构可以防止超导磁体电流引线上的高感应电压上升,从而自然地保护系统(超导磁体和电流源)免受可能的损坏。此外,还预测脉冲磁体的杂散场,如引起超导磁体绕组中涡流的杂散场,将大大减小。推导了补偿脉冲线圈几何结构设计的简单理论。理论分析结果证明了这一新概念的优越性,并以克拉伦登实验室设计和制造的脉冲线圈为例,该线圈与牛津仪器超导磁体(克拉伦登混合磁体外)相连接,在室温工作空间中产生直径为240 mm的稳定磁场,最高可达10 T。
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New design concept of the magnet system generating the high pulsed field in combination with the bias field of the superconducting magnet

A new design concept of the axisymmetric magnet system generating the very high pulsed magnetic field which is superimposed on the bias magnetic field of the superconducting magnet is presented. The pulsed magnet consists of two coaxial coils which are wound in opposite directions. The geometry of both pulsed coils, i.e. the working (inner) one and the compensating (outer) one is designed in such a way that the mutual coupling between the small pulsed magnet and the outer superconducting magnet is practically zero. This configuration prevents the rise of the high induced voltage on the current leads of the superconducting magnet when the pulsed magnet is being energised, hence resulting naturally in protection of the system (superconducting magnet and the current source) against possible damage. Further, it is predicted that the stray field of the pulsed magnet, which gives rise e.g. to the eddy currents in the winding of the superconducting magnet, is considerably decreased. The simple theory enabling the design of the geometry of the compensating pulsed coil is derived. The advantages of this new concept are demonstrated on the results of the theoretical analysis using, as an example, one of the pulsed coils that were designed and fabricated in the Clarendon Laboratory, in connection with the Oxford Instrument superconducting magnet (Clarendon hybrid outer) which can generate a steady magnetic field up to 10 T in a room temperature working space with a diameter of 240 mm.

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