IFMIF-EVEDA
The IFMIF-EVEDA accelerator [1] will be a 9 MeV, 125mA cw deuteron accelerator, identical to the low energy section of one of the IFMIF accelerators [2], which will be tested to verify the validity of the design before launching the IFMIF construction. It includes an ion source, a Radiofrequency Quadrupole cavity and the first module of a superconducting linac based on half wave resonator cavities. As no target is foreseen for the accelerated beam, a beam dump is required to stop it during commissioning and accelerator tests. The beam will be validated before the beam stop using non interceptive diagnostics, due to the high intensity in cw mode.
Commisioning and operation plan
To minimize the accelerator activation, the commissioning will be performed mainly with H2+ pulsed beams with progressively increasing duty factor and current up to the nominal 125mA current. Therefore the beam dump must be able to stop deuteron and H2+ continuous and pulsed beams with energies 5MeV (RFQ commissioning) and 9MeV. The maximum beam power is 1.12MW corresponding to a beam current of 125mA. A maximum operation time at full current of D+ of around 1 year and an operation time with 5Hz pulsed beam with 0.1% duty cycle of 2 months have been assumed.