摘要
计算证明在低场区的电磁铁中,不同的磁铁材料对磁铁工作的好场区范围有很大的影响。为了设计具有较大好场区而又结构紧凑的电磁铁,以电子回旋加速器中的电磁铁设计为例,对DT4铁、A3钢等制成的磁铁,利用POISSON程序模拟计算其各自的磁场分布情况,并进行比较。结果显示:在相同结构下,以磁导率较大的DT4铁作为材料的磁铁其极间好场区半径为38cm,比A3钢磁铁的好场区半径大20cm。由此可得出结论:磁铁材料的磁导率越大,磁铁的磁场分布越均匀,即好场区越大。
In a low magnetic field, the choice of the magnetic material can affect the good field region, the spectra in which the magnets can work normally. The magnetic field around an electromagnet was modelled using a POISSON program with iron DT4 and steel A3 as the magnetic materials. The model was used to design a compact electromagnet which is able to work in the maximum good field region with the electromagnet in a circular accelerator as an example. The results show that, for the same structures, an electromagnet made of iron DT4, which as a greater permeability, has a good field region with radius 38 cm, which is 20 cm bigger than for an electromagnet made of steel A3. Therefore, larger permeabilities give more uniform magnetic fields and, thus, larger good fields.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2003年第10期1363-1364,1372,共3页
Journal of Tsinghua University(Science and Technology)
