Influence of magnetic fields on a magnetic suspended compound-molecular pump.

Estimation of Eddy Current Loss for a Turbo-molecular Pump in the J-PARC Rapid Cycling Synchrotron

“…(1) The parallel magneticˆeld has no in‰uence, on the other hand, the driving power and the rotor temperature are greatly aŠected by the vertical magneticˆelds. (2) The eddy current loss is formulated and well estimated with a model where a localized magneticˆeld and current ‰ow exist within the rotor into the region down to a substantial skin depth d from the surface. This time we applied the above conclusions to the TMPs with high radioactive resistance which were employed in the 3 GeV rapid cycling synchrotron (RCS) in J PARC (Japan Proton Accelerator Research Complex).…”