公开(公告)号：US4658229A

公开(公告)日：1987-04-14

申请号：US733232

申请日：1985-05-10

申请人： Wilkie Y. Chen ,  Yen-Hwa L. Hsu ,  John R. Purcell

发明人： Wilkie Y. Chen ,  Yen-Hwa L. Hsu ,  John R. Purcell

IPC分类号： G01R33/3815 ,  G01R33/3875 ,  H01F7/22

CPC分类号： G01R33/3815 ,  G01R33/3875 ,  Y10S505/879

摘要： A magnet system for providing a substantially homogeneous magnetic field in a region. The magnet system includes a main coil and a pair of correcting coils with the main coil generating a magnetic field in a zone including the region. The correcting coils are at first and second locations in the zone and are connected to one another so that a magnetic field generated by the main coil will induce currents in the correcting coils which oppose one another. The correcting coils are constructed so that there will be no resultant current in them when there is generated substantially the same field strength of both of the first and second locations. Thus, the generation of differing magnetic field strengths at the respective locations effects generation of a resultant current in the correcting coil causing strengthening of the magnetic field at the location having the lesser magnetic field strength and weakening of the magnetic field at the other location, making the net field relatively homogeneous.

摘要翻译： 一种用于在区域中提供基本均匀的磁场的磁体系统。 磁体系统包括主线圈和一对校正线圈，其中主线圈在包括该区域的区域中产生磁场。 校正线圈位于区域中的第一和第二位置处并且彼此连接，使得由主线圈产生的磁场将引起彼此相对的校正线圈中的电流。 校正线圈被构造成使得当第一位置和第二位置都产生基本上相同的场强时，在其中将不存在合成电流。 因此，在各个位置处产生不同的磁场强度会影响校正线圈中的合成电流的产生，从而在具有较小磁场强度的位置处增强磁场并使另一位置处的磁场变弱 净场相对均匀。

公开(公告)号：US4369636A

公开(公告)日：1983-01-25

申请号：US280325

申请日：1981-07-06

申请人： John R. Purcell ,  Wilkie Y. Chen ,  Walter E. Toffolo

发明人： John R. Purcell ,  Wilkie Y. Chen ,  Walter E. Toffolo

IPC分类号： F17C13/00 ,  H02G15/34 ,  F25B19/00

CPC分类号： H02G15/34 ,  H01F6/04 ,  Y02E40/648 ,  Y10S505/892

摘要： Methods and apparatus are provided for minimizing heat introduced by electrical leads into the cryogenic liquid in which a superconducting magnet is immersed. The electrical leads have normal portions extending from exterior of the cryogenic liquid containment vessel and thereinto and superconducting portions extending vertically downward therefrom and connected to the magnet. Means are provided to lower and raise the level of cryogenic liquid around the superconducting portions of the leads to fully immerse the supercoducting portions during periods of magnet energization and expose selected segments thereof when the magnet is de-energized. When exposed, the non-immersed segments provide a thermal resistance between the normal metal portions and the cryogenic liquid.

摘要翻译： 提供的方法和装置用于最小化电导线引入浸入超导磁体的低温液体中的热量。 电引线具有从低温液体容纳容器的外部延伸的正常部分和从其垂直向下延伸并连接到磁体的超导部分。 提供了用于降低和提高引线的超导部分周围的低温液体的水平，以在磁体通电期间完全浸入超导部分，并在磁​​体断电时暴露其选定的部分。 当暴露时，非浸没段在正常金属部分和低温液体之间提供热阻。