In the framework of the IPHI project (High Intensity Proton Injector), the RFQ cavity is divided into 6 sections of 1 meter each, which are assembled in 3 coupled segments. We present the tuning procedure of the IPHI aluminium cold model, that is (i) adjusting coupling capacitances and dipole rods for optimum stability and (ii) tuning the 96 slugs to achieve constant inter-vane voltage. Fields inside RFQ quadrants are measured by a fully automated bead-pull system. Tuning this 6-meter long cold model is a comprehensive training in view of the future tuning of the copper RFQ with the variable voltage profile. |
