Optimization of a superferric nuclotron type dipole for the GSI fast pulsed synchrotron
Optimization of a superferric nuclotron type dipole for the GSI fast pulsed synchrotron
复制标题
GSI 快脉冲同步加速器超铁核子型偶极子的优化
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
C. Mühle
中科院分区：
文献类型：
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作者：
A. Kovalenko;A. Kalimov;H. Khodzhibagiyan;G. Moritz;C. Mühle
GSI计划升级其加速器设施。快脉冲同步加速器(刚性100TM，偶极场/斜坡率2T/4T/S)是GSI未来计划的主要组成部分之一。预计该同步加速器将使用核子加速器类型的超导磁体。为了提高直流磁场质量，降低低温交流损耗，进行了大量的研究工作。采用线性二维计算方法对偶极磁铁的磁极形状进行了优化设计。因此，引入了负垫片。随后的非线性延伸导致在铁轭上引入了空气缝隙，这在更高的水平上改善了田间质量。然后，通过改变线圈长度和线圈长度之间的比例，使用非线性三维模拟来优化积分场的均匀性。我们用这种优化的铁层压截面制作了一个模型磁铁。为了降低交流损耗，采用了不锈钢端板、低矫顽力铁、绝缘较好的铁层压片，并将超导灯丝尺寸减小到6/SPL MU/m，分析了对磁体损耗的各种贡献。对磁体端部垂直于铁片的磁场分量所产生的涡流效应的数值计算表明，这一部分是不可忽略的。给出了磁体测试结果，并与预期的磁场质量和损耗进行了比较。
GSI plans to upgrade its accelerator facilities. A fast-pulsed synchrotron (rigidity 100 Tm, dipole field/ramp rate 2T/4T/s) is one of the main parts of the GSI future project. Superconducting magnets of the Nuclotron type are foreseen for this synchrotron. R&D work has been done in order to improve the DC field quality and to reduce the cryogenic AC losses. Linear 2-D calculations were used to optimize the pole shape of the dipole magnet. Consequently, a negative shimming was introduced. Subsequent nonlinear extension led to the introduction of air slits in the iron yoke which improved the field quality at higher levels. Nonlinear 3-D simulations were then used to optimize the homogeneity of the integral field, by varying the ratio between the yoke and coil length. We built a model magnet with this optimized iron lamination cross section. In order to reduce the AC losses, we used stainless steel end plates, low coercitivity iron, better insulated iron lamination sheets and reduced the superconductor filament size to 6 /spl mu/m. Various contributions to the losses of the magnet were analyzed. Numerical calculations of the eddy current effects due to field components perpendicular to the iron laminations at the end of the magnet showed that this part must not be neglected. The magnet test results are presented and compared with the expected field quality and losses.