分立线圈超导磁体
分立线圈广泛应用于中子，μ介子和X射线散射和衍射实验中。
牛津仪器在设计中子散射应用的超导磁体中处于世界领先位置。我们可以向您提供不同场强方向，不同磁场强度（可达15T），不同束线通路的磁体来帮助您构建独一无二的实验平台。
为了保证在束线散射应用中达到最佳操作，我们的磁体具有如下特定性能：
- 水平方向两个相对方向的磁场
- 束线面上没有液氦。中子束可以直接通过。
- 可以与束线工作站便捷集成。
- 便捷快速更换样品
用于中子散射的零蒸发液氦杜瓦
如何在提升束线工作站的利用率的同时降低对液氦消耗的依赖？也许如下自冷凝的方案您会感兴趣:
- 最优化磁体性能
- 最优化的换样方法，可以提高束线利用率
- 与无液氦方案相比，更快的扫场速率及更高的VTI性能。
- 可以在停电，压缩机实效等意外情况下维持磁场更长时间。
牛津仪器在设计零蒸发中子散射磁体方面具有无以匹敌的经验。近期我们已经向 Rurtherford laboratory (UK)提供了一套磁体设备，向 ILL in Grenoble提供了两套设备。
在相关资料下载区可以看到更多细节信息。
- 高磁场磁体的典型参数
- 零蒸发液氦杜瓦实例
- 系统照片
| 磁场强度 |
15 T at 2.2 K 13.5 T at 4.2 K |
| 场强方向 | 垂直 |
| 均匀度 (10 mm DSV ) | 0.5 % |
| 磁体中心分距 | 20 mm |
| 分立角 | +/- 2 degree |
| 中子束通路 | 330 degree |
| 样品温度范围 | 1.6 - 300 K |
Rutherford Appleton Laboratory 购买了两套自冷凝中子散射磁体，一套9T，宽角度，一套是4.2K时达到14T的磁体。这些磁体将用于ISIS的LET, MERLIN以及WISH 工作站。
Dr. Oleg Kirichek,
Sample Environment Group Leader at ISIS, Rutherford Appleton Laboratory
commented: “Having a recondensing system allows us to considerably reduce
our helium cost and health and safety issues. It also provides a homogeneous
temperature distribution, which is crucial for optimum magnet performance. With
these magnets, we should be able to provide our users with high magnetic field
sample environments for neutron scattering experiments in a number of research
areas such as high temperature superconductors, quantum magnets, spintronic
materials, spin frustrated systems, heavy fermions, nanomagnetic materials and the
recently discovered iron-based high-temperature superconductors.”
The ILL(Institut Laue-Langevin, Grenoble) received a 10 T asymmetric split pair coil magnet for their three-axis spectrometers. Dr Eddy Lelièvre-Berna, Advanced Neutron Environment Team Leader at ILL, commented: “With this new design, the superconducting coils are reliably maintained at low temperature within a liquid Helium bath while considerably reducing the boil-off. Compared with dry systems, the absence of room-temperature bore provides a much larger sample space. It also reduces the amount of material in the beam and avoids unwanted neutron absorption and neutrons scattered to the detectors. Together, we have really made a step forward. Among the many topics to be investigated with this magnet are multiferroic properties, quantum phase transitions and excitations in single-molecule magnets. Our satisfaction is such that we have decided to order another magnet for studying the magnetic substrates of our future hard disks.”
我们制造的具有世界上最宽角度的9T中子散射磁体照片，于2009年4月提供给ISIS。
样品访问角: 2 x ( ±15º 垂直方向，90º 水平方向)
Dr Oleg Kirichek and Richard Down from the Rutherford Appleton Laboratory with their 14 T at 4.2K neutron scattering magnet, offering sample access of +10º/-5º in the vertical and 340º in the horizontal direction.
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