Each of three kicker magnets consists of a pair of 4.5cm by 1.27m long aluminum plates. The plates conform to the curvature of the 4.5 cm radius storage volume and the 7.11m bending radius. The upstream end (with respect to the direction of the muon beam) of the inner plate is connected via high voltage feedthrough to the load resistors in the bazooka canister which in turn are in series with the inner conductor of the Blumlein. The upstream end of the outer plate is connected to ground (the outer conductor of the Blumlein). The inner and outer plates are connected together at the downstream end. The measured inductance, capacitance and impedance of the single turn magnet are 1 micro-Henry, 40pF, and Z~150 Ohms.

The magnetic field profile depends on the geometry of the kicker plates. Field uniformity is improved by increasing the height of the plates and moving them further (radially) from the center of the storage volume. The current required to achieve the requierd vertical field at the center of the storage volume likewise increases with plate height and offset. The E989 geometry is chosen to operate with maximum efficiency, to yield maximum peak field on center line with minimum current. While the field uniformity is not as good as for the E821 geometry, we note that it was impossible to drive sufficient current through the 821 kicker to reach the requisite field.

The calculated field profile along the vertical midplane for the E989 geometry is shown in the Figure at left and the measured field at right.

Instrumentation for measuring the kicker field includes a pickup coil and stage.

The azimuthal component of the field within 1/2 coil radius of the center, is measured by rotating the pickup coil about its axis. The sinusoidal dependence is consistent with expectation.