Completion of superconducting magnet production at BNL for the HERA luminosity upgrade
Completion of superconducting magnet production at BNL for the HERA luminosity upgrade
复制标题
BNL 完成用于 HERA 光度升级的超导磁体生产
DOI：
10.1109/tasc.2002.1018406
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
K. Wu
中科院分区：
文献类型：
--
作者：
P. Wanderer;M. Anerella;J. Escallier;A. Ghosh;A. Jain;A. Marone;J. Muratore;B. Parker;A. Prodell;P. Thompson;K. Wu
布鲁克海文国家实验室（BNL）已经完成了超导多功能磁体的生产，现在作为DESY的HERA亮度升级的一部分安装。磁体、低温恒温器和引线组件都是在BNL设计和制造的。为了适应现有的探测器，线圈加上低温恒温器结构必须满足一个具有挑战性的径向预算（例如，水平39毫米）。需要两种类型的磁铁，每种制造了三个。每个磁体包含正常和倾斜四极，正常和倾斜偶极，和六极线圈。磁铁在检测器的/spl sim/1.5 T螺线管场中工作。四极线圈产生高达13 T/m的梯度。偶极线圈产生高达0.3 t的磁场。在计算机控制下，用七股圆电缆或单股电缆缠绕线圈。为了同时避免过多的同步辐射背景散射从束流管，但有一个小的低温恒温器，一种类型的磁铁使用锥形线圈结构。低温系统结合了40k氦和超临界氦的冷却。所有的线圈都在垂直杜瓦瓶的液氦中进行了测试。淬火试验结果非常好。磁体的磁场质量满足相互作用区磁体的严格要求。每种类型的一个磁铁在BNL作为一个完整的组件进行测试，以验证引线和低温恒温器的性能。每种类型的两个在DESY进行测试，然后安装在Zeus和H1实验中。剩下的磁铁是备用的。报告了淬火试验、现场质量测量和低温性能的最终结果。
Brookhaven National Laboratory (BNL) has completed production of the superconducting multi-function magnets that are now installed as part of the HERA luminosity upgrade at DESY. The magnets, cryostats, and lead assemblies were designed and built at BNL. To fit inside the existing detectors, the coils plus cryostat structure had to meet a challenging radial budget (e.g., 39 mm horizontally). Two types of magnets were needed and three of each type were built. Each magnet contained normal and skew quadrupole, normal and skew dipole, and sextupole coils. The magnets operate in the /spl sim/1.5 T solenoid field of a detector. The quadrupole coils produce gradients up to 13 T/m. The dipole coils generate fields up to 0.3 T. Coils were wound under computer control using either seven-strand round cable or a single strand. To simultaneously avoid excessive synchrotron radiation background scattered from the beam pipe and yet have a small cryostat, one type of magnet used a tapered coil structure. The cryogenic system incorporates cooling with both 40 K helium and supercritical helium. All of the coils were tested in liquid helium in a vertical dewar. Quench test results have been excellent. The field quality of the magnets has met the stringent requirements imposed on interaction region magnets. One magnet of each type was tested at BNL as a completed assembly to verify the performance of the leads and cryostats. Two of each type were tested at DESY and then installed in the Zeus and H1 experiments. The remaining magnets are spares. Final results of quench testing, field quality measurements and cryogenic performance are reported.