上海光源超导波荡器磁体5周期模型机的研制

Research and development of a 5-period mockup magnet for undulator at the SSRF

上海光源正在研制一台低温超导波荡器模型机,周期数50,周期长度16mm,磁间隙8mm,目标峰值磁场0.88T。首先研制了一台5周期超导波荡器磁体模型机进行技术可行性研究。磁体绕组采用Nb Ti超导线,骨架加工采用电工纯铁。使用传导冷却的测试装置进行了磁体降温、通电与磁场测量。磁体经过两次失超之后达到设计电流值387A。达到的最大电流为433A。当磁体稳定运行在400A时,测得磁场峰值为0.93T。研究结果表明已有的超导磁体关键技术与工艺能够满足50周期超导波荡器模型机的研制需求。

A low - temperature superconducting planar undulator is under development at the Shanghai Synchrotron Radiation Facility（SSRF）. The undulator prototype has 50 periods with a period length of 16mm and a gap of 8mm. The peak field is targe- ted to be 0. 88T. A 5 - period magnet was designed and built for feasibility study. The short mockup magnet is composed of NbTi,/ Cu winding and low carbon steel former and was tested in a vertical cryoeooler - cooled cryostat. The nominal current of 387 A was reached after 2 quenches and the maximum current of 433.2 A was achieved. The magnetic field profile was measured and a peak field of 0. 93T was obtained when stably operating at 400 A. Test results indicated that superconducting magnet techniques in the SSRF are feasible for the 50 - period undulator prototype.