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The SRF cavities used for LCLS-SC contain 9 cells, are 1.038m long, and are made of niobium. The cavities are welded into titanium "helium vessels" which create a space around them to hold liquid helium. (See [[Intro to Cryo]] article Introduction to LCLS-SC Cryo Systems article for more details.)
[[File:Nelson_20210831_Slide4.jpeg]]
[[File:Nelson_20210831_Slide20.jpeg]]
RF Source
The 1.3 GHz CW RF is produced by the low level RF (LLRF) system then amplified by a solid state amplifier (SSA). The output is directly through rectangular waveguide from the SSA in the gallery to the cavity in the accelerator housing. Each cavity has its own SSA. The RF is fed through a fundamental power coupler (FPC) to the cavity. The coupler feeds the RF into the downstream end of the cavity.<br>
From Andy's talk 22May2020: <br>
[[File:Benwell_20200522_Slide3.png]]
[[File:Benwell_20200522_Slide5.png]]<br> 
From Janice's 31Aug2021 talk:<br>
[[File:Nelson_20210831_Slide5.jpeg]]
[[File:Nelson_20210831_Slide6.jpeg]]
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