Ultrastable superconducting magnet system for a penning trap mass spectrometer
Ultrastable superconducting magnet system for a penning trap mass spectrometer
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用于潘宁陷阱质谱仪的超稳定超导磁体系统
DOI：
10.1063/1.1149649
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发表时间：
1999
影响因子：
1.6
通讯作者：
P. Schwinberg
中科院分区：
文献类型：
--
作者：
R. Dyck;D. Farnham;S. L. Zafonte;P. Schwinberg
描述了定制设计的磁体/低温恒温器系统，该系统已证明比以前的设计显着提高了场稳定性。为了屏蔽外部磁噪声，定制的磁通门设备远程感测磁场的变化，并通过 1.7 米直径的亥姆霍兹线圈在磁铁/低温恒温器处将其抵消。为了提供进一步的屏蔽，基本超导螺线管包括无源磁通稳定线圈。为了稳定内部磁场变化，通过新的低温恒温器几何形状并将蒸发液氦的压力控制在百万分之几，可以稳定螺线管附近材料的温度（具有与温度相关的磁化率）。因此，整个系统现在的复合屏蔽系数约为 104，总体时间稳定性约为每小时 1012 个部件中的 17(2) 个部分。该仪器是我们新型潘宁阱质谱仪的核心，最近被用于开发...
A custom-designed magnet/cryostat system is described which has demonstrated remarkably improved field stability over previous designs. To shield from external magnetic noise, a custom-fabricated flux-gate device remotely senses the changes in magnetic field and cancels them out at the site of the magnet/cryostat via a 1.7-m-diam Helmholtz coil. To provide further shielding, the basic superconducting solenoid includes a passive flux-stabilizing coil. To stabilize internal field shifts, the temperature of the materials in the immediate vicinity of the solenoid (which have a temperature-dependent susceptibility) is stabilized via the new cryostat geometry and by controlling the pressure of the evaporating liquid helium to a few parts per million. As a result, the total system now has a composite shielding factor of approximately 104 and an overall temporal stability on the order of 17(2) parts in 1012 per hour. This instrument, the heart of our new Penning trap mass spectrometer, has recently been used to d...