Why a D-D reaction in the Divertor Tokamak Test Facility?

The DTT project proposal talks about a D-D reaction inside the future tokamak that is going to be built in Italy, Frascati. Which is the reason of this choise? The cross section is smaller than the D-T reaction one, and neutrons are less energetic. How this influences heat and particle exhaust on the divertor? and how does the heat flux changes?
It is a divertor test facility. The divertor is mainly hit by ions from the plasma. While it is also hit by some neutrons that plays a smaller role. The DTT won't have any relevant fusion as far as I understand.

Tritium is more difficult to work with, unless there is a strong reason to do so operation with deuterium is easier.

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