Higher order mode damping for a detuned structure

We report in this paper the current status of our investigation of the possibility of suppressing the wake reappearance by providing relatively weak damping via the vacuum manifolds. The four vacuum manifolds running the length of the structure also function as multimode waveguides which serve to drain power from the HOM`s through the large coupling slots located in each cell, except, as discussed later, for a few at each end of the manifolds.