ELECTRIC AND MAGNETIC DESIGN OF THE g-2 MAGNETIC KICKER

The ultra-high precision g-2 experiment requires a fast kicker to deflect incoming muon beam with a momentum of 3.094 Gev/c. A magnetic kicker was selected since this approach requires the lowest excitation voltage of all designs considered. However, a higher driving current (>6000A) is required which leads to more residual eddy current field to influence the main dipole magnetic field. Several possible magnetic kicker designs were investigated to determine their effects on kicker field quality, driving efficiency (B/I) and inductance per unit length. A satisfatory construction is a two plate kicker with shaped edges for the two electrodes. Using the transient eddy current analyses (Opera 2d/TR)[1], the authors studied a variety of factors which affect the eddy current residual field. This paper presents the electric and magnetic parameters of the magnetic kicker which was completed in 1996 and has been put into operation now.