Requirements on power factor (Dick) not been looked at. 
How much variation is allowed on the line? DESY addressed this in a recent paper. They addressed this differently. They must keep the 5 10 Hz fluct .25 % what the utility sees. DESY analyzed what it takes to arrange this. 

Recommend a rectifier and a switcher on top of that. The switcher is only working on 20%. The rectifier works on the rest. The total harmonic distortion. Phase shifting transformers. 



There is a design impact for making the different kinds of phase shifting transformers.

 The ILC linac cost model should be modified to include these devices 1) DC rectifier, 2) and switcher supply, and 3) phase shifter transformers.