  The RFQ of the project IPHI is a 8 meter long, high power, very precise
tolerances (0.01 mm on 1 meter long for example) device to accelerate protons.
This RFQ is similar to the RFQ of the LEDA project. So, we realize a thermal
and mechanical studies followed by different tests for machining and brazing
copper. We describe in this paper those different steps and the way we proceed
to supply the fabrication itself by an independent company.
