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Stray field of a pulse septum induced by eddy currents

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2 Author(s)
Shoji, Y. ; Lab. of Adv. Sci. & Technol. for Ind., Himeji Inst. of Technol., Ako, Japan ; Kumagai, K.

NewSUBARU, a 1.5 GeV storage ring, has a magnetic pulse septum to inject a 1 GeV electron beam from the SPring-8 linac. Its maximum field is 0.36 T with waveform of 1 ms width half-sine. Behavior of a stored electron beam indicated an existence of a stray field whose time structure was cosine like. A beam pipe for an injected beam and a beam duct for a circulating beam made an electric loop path of an eddy current induced by the magnetic field of the septum. Off-beam measurements of magnetic field and the induced current confirmed the existence and paths of the eddy currents. An electric insulation added to a metal support of a beam pipe cut the loop path and reduced the cosine like stray field. There still exists a weak current, which runs long path along a beam transport line.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:14 ,  Issue: 2 )

Date of Publication:

June 2004

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