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TY - CPAPER AU - Adolphsen, C. AU - Fant, K. AU - Gonin, I.V. AU - Li, Z. AU - Nantista, C.D. AU - Premo, K. AU - Solyak, N. AU - Stupakov, G. AU - Tice, J. AU - Wang, F.Y. AU - Xiao, L. TI - Modified TTF3 Couplers for LCLS-II J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - The LCLS-II 4 GeV SC electron linac will use 280 TESLA cavities and TTF3 couplers, modified for CW operation with input power up to about 7 kW. The coupler modifications include shortening the antenna to achieve higher Qext and thickening the copper plating on the warm section inner conductor to lower the peak temperature. Another change is the use a waveguide transition box that is machined out of a solid piece of aluminum, significantly reducing its cost and improving its fit to the warm coupler window section. This paper describes the changes, simulations of the coupler operation (heat loads and temperatures), rf processing results and CW tests with LCLS-II dressed cavities. PB - JACoW CY - Geneva, Switzerland SP - 1306 EP - 1308 KW - operation KW - vacuum KW - simulation KW - cavity KW - linac DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-THPB077 UR - http://srf2015.vrws.de/papers/thpb077.pdf ER -