| 摘要 |
1,164,338. Superconductor magnets. VARIAN ASSOCIATES. 8 May, 1967 [11 May, 1966], No. 21246/67. Headings H1K and H1P. In a superconductor solenoid magnet system axial field gradients of the main solenoid are cancelled by one or more orthogonally arranged coils operating in the persistent mode and magnetically coupled to the main winding so that the gradient-cancelling effect is maintained when the intensity of the main magnetic field is varied. In a first embodiment, Fig. 1 (not shown), the gradient cancelling coils (56) are energized from a D.C. transformer, Fig. 6 (not shown), the primary of which is connected in series with the main solenoid. The current in each of the transformer secondary windings can be individually adjusted by rotating an armature about which it is wound. The gradient cancelling coils 56 may be arranged about the main solenoid as illustrated in Fig. 4. In a second embodiment, the gradient cancelling coils are arranged inside the main solenoid and have their ends connected together so that the field gradients induce currents in the coils, and the coils are thus self-adjusting. In a further embodiment, Fig. 5 (not shown), each gradient cancelling coil is provided with a persistent current switch and the coils may be sequentially connected to a controllable power supply by means of which the desired energizing current can be established in each coil before it is switched to the persistent mode.
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