The Damping Ring Window is currently .3 " thick and 10" in diameter. There is some empirical evidence that the window is too thin for its diameter, and will have a tendency to puncture, rather than arc on the air-side without puncturing as evidenced with the PEP-II window design. Modeling of the current window was done in HFSS and a thickness increase to .6" is possible with slight changes in the rectangular WG stub length. We recommend this increase in thickness, which, if the arcing/puncture model is accurate, will not puncture, but arc on the air-side first, thus increasing the reliability of the Damping Ring Window design.