Delta-Phi Method for the IFMIF-LIPAc SRF-Linac Cavity Tuning

In order to achieve the upcoming commissioning of the IFMIF-LIPAc prototype accelerator in Rokkasho, the accuracy and resolution required for all diagnostics must be determined. These specifications will depend on the accuracy at which the tuning parameters must be set and finally on the tuning errors that can be tolerated on the beam itself. We will here discuss the use of the ∆φ method to tune the SRF Linac and the resolution requirements it implies for the BPMs. This method, using a relative time of flight measurement to assess the energy of the beam, has the advantages of allowing setting the beam energy and beam longitudinal focusing at once.