The IFMIF RFQ is designed with very challenging specifications to accelerate a 125mA deuterons beam from 0.1 MeV to 5 MeV at a frequency of 175 MHz, consists of 18 modules with length of ~550 mm each. The total lenght is 9.78 m.
During the three years of PhD the candidate was involved on different aspects, from the mechanical design to the quality control on the production process.
Chapter 1 presents a general overview of the IFMIF project and the scientific context.
On chapter 2 the design of the cooling system of the modules of the accelerator will be described, with the development of thermal-structural and fluid-thermal-structural numerical analyses.
Chapters 3 and 4 will describe the development of an in-house technology for the vertical brazing and the fixation tooling, by means a strict collaboration of the section of Padova of INFN and the LNL. The developments of 1D and 3D FE analyses for the prediction of the thermal brazing cycle will be described.
Moreover, the improvements on the control (visual and ultrasonic inspection) of the brazed joints and the feedbacks to the mechanical design will be presented.
Chapter 5 will describe the various phases of the production of the modules of the RFQ with the most important mechanical design aspects.
The production of the IFMIF EVEDA RFQ accelerator is a quite challenging task due to the narrow tolerance of the pieces that should be guarantee also after some thermal
treatments for the brazing.
The focus will be in particular to the quality control of the single elements and the entire modules during the production:
-The dimensional quality control, prevalently by CMM with active scanning probe.
-The quality assurance of the brazed joints by visual and the ultrasonic inspection.
Their influence for the design choices and the solution of eventual problem will be described
