Title :
Time evolution of fields in strontium ferrite permanent magnets
Author :
Volk, J.T. ; Brown, B.C. ; Foster, G.W. ; Fowler, W. ; Glass, H.D. ; Jackson, G.P.
Author_Institution :
Fermi Nat. Accel. Lab., Batavia, IL, USA
Abstract :
Field strengths for strontium ferrite permanent magnets built for the Fermilab Recycler and the 8 GeV transfer line have been measured for the past 4 years. The ferrite magnetization exhibits a time dependence parameterized by M1/M2 = -9 × 10-4 × 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
Keywords :
accelerator magnets; ferrites; magnetisation; permanent magnets; proton accelerators; storage rings; strontium compounds; 4 y; 8 GeV; Fermilab Recycler; Sr-Fe-O; antiproton storage ring; ferrite magnetization; field strengths; gradient magnet; magnetic field time evolution; permanent dipole magnets; permanent quadrupole magnets; strontium ferrite permanent magnets; time dependence; transfer line; Apertures; Ferrites; Glass; Magnetic field measurement; Magnetization; Magnetosphere; Permanent magnets; Production; Strontium; Time measurement;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.988062
