Title :
Eddy current effect of very long time constant of block magnets
Author :
Kumada, M. ; Ogawa, H. ; Sato, K. ; Kase, M. ; Okuno, H.
Author_Institution :
Nat. Inst. of Radiol. Sci., Chiba, Japan
Abstract :
We have observed a transient effect of a magnetic field in a gap of block magnet with very long time constant, which extends to an e-folding time of an hour. It was confirmed that not only a response of the magnetic field strength but also the field gradient changes. This phenomena could be accounted for the eddy current field induced in the iron core and yoke of the magnet. An attempt was made to explain by analytical expressions and by a numerical computation. Details of the data and analysis are presented
Keywords :
accelerator magnets; eddy currents; magnetic fields; Fe core; block magnets; e-folding time; eddy current field; field gradient; long time constant; magnetic field strength; time constant; yoke; Coils; Cooling; Cyclotrons; Eddy currents; Equations; Iron; Magnetic analysis; Magnets; Spectroscopy; Temperature;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.753197
