Cavity Gradient R&D Goals Consideration in RDR/SB2009 Re-optimization required in TD Phase 2 R&D goal: S0 - 9-cell cavity gradient 35 MV/m (≥ 90%) 35 MV/m (≥ 90 %): kept for forward looking R&D goal: S1 - Cryomodule gradient w/o beam 31.5 MV/m in average 31.5 MV/m in average or higher to be optimized for reasonable cryomodule operational margin, inclusive R&D goal: S2 -Cryomodules gradient with beam acceleration Not specifiedLikely to be the same as ILC operational gradient ILC-ML design value: - Accelerating gradient 31.5 MV/m in average 31.5 MV/m in average or lower to be optimized for reasonable accelerator operational margin, inclusive 10-07-20, A.
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