You had to pay? I understand the machine cost many hundreds of millions of dollars, but I would have thought for academic researchers doing open science, the beamtime is free (funded by the govt / science trusts).
In this case the time on the equipment would need to be included, both a portion of the cost of building/maintaining it, and probably the energy needed to run it. Even where the government is providing the grant (likely here), it still needs to be accounted for.