Transverse Coupling Impedance of the RHIC Injection Kicker

The results of transverse coupling impedance measurements of the RHIC injection kickers are presented. The impedance measurements were made using the standard two-wire method to obtain the forward transmission coefficient S21 of the "Device Under Test " with respect to a reference tube of equal length, and were interpreted via the log-formula. The measurements were made in a test stand, reflecting fully the operational conditions. The transverse impedance of the dielectric loaded traveling wave kicker is largest below 10 MHz and reaches for a single unit in the vertical, i.e. the kick direction 190+j350 kΩ/m and in horizontal direction 100+j300 kΩ/m. The inductive component of the all-ferrite version is about 20 % larger. The contribution to the total impedance budget reflects four kicker units per ring