RHIC Injection Kicker Impedance

The RHIC injection kicker is a pulsed transmission line kicker, consisting of 15 ferrite sections and 14 ceramic sections. The length of the kicker is 1.1 m and there are 4 such units in each ring. Figure 1 shows the kicker cross section with the outer conductor, C-shaped ferrite, inner conductor and the ceramic beam pipe [1]. The design characteristic impedance of the transmission line kicker is 25 ohm. Each kicker will be pulsed with a Blumlein pulser and terminated by a matched resistor. The ferrite material used is Ceramic Magnetics CMD5005. The initial permeability of the ferrite is 1600 at low frequencies, and the dielectric constant is 12. The ceramic is manufactured by Trans-Tech and has a high dielectric constant of 100. The wave propagation velocity in the magnet is approximately 1/15 the speed of light. The design field risetime in the magnet is 80 nsec, and the flattop is about 40 nsec. The nominal integrated magnetic field is 1900 G-m from 4 units [2].