Development of a large nanocrystalline soft magnetic alloy core with high μ'_pQf products for CSNS-Ⅱ

作者：Bin Wu; Xiao Li; Zhun Li; Chun-Lin Zhang; Yang Liu; Wei Long; Xiang Li; Jian Wu

来源：Nuclear Science and Techniques, 2022, 33(08): 47-56.

• Large size magnetic alloy core
• High insulation and low stress coating
• Waterproof structure
• Transverse magnetic field annealing
• High power MA-loaded cavity

A waterproof nanocrystalline soft magnetic alloy core with a size of O.D.850 mm × I.D.316 mm ×H.25 mm for radio frequency acceleration was successfully developed by winding 18 μm 1k107b MA ribbons. The μ’pQf products reached 7.5, 10, and 12 GHz at 1, 3, and 5 MHz, respectively. The μ’pQf products of the MA core(O.D.250 mm × I.D.100 mm × H.25 mm) manufactured using a 13 μm MA ribbon further increased by 30%.Detailed improvements on the MA core manufacture process are discussed herein. Continuous high-power tests on the new MA cores demonstrated its good performance of waterproofness, particularly its stability of high μ’pQf products. The MA core with high μ’pQf product and large size can operate under a high average RF power, high electric field, and in deionized water, which will be used in the China Spallation Neutron Source Phase Ⅱ(CSNS-Ⅱ).

• 单位
  中国科学院大学