Time evolution of fields in strontium ferrite permanent magnets.

Volk, J. T.

Technical Information Center Oak Ridge Tennessee

关键词: Permanent magnets;    Strontium;    Ferrimagnetism;    Storage rings;    Quadrupoles;   

RP-ID  :  DE2001781634

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Field strengths for strontium ferrite permanent magnets built for the Fermilab Recycler and 8 GeV transfer line have been measured for the past 4 years. The ferrite magnetization exhibits a time dependence parameterized by M1/M2=-9 x 10-4 x log (t1/t2) as determined from measurements of a gradient magnet. This parameterization has been checked against several other styles of permanent dipoles, and quadrupole magnets with good agreement.