Speaker
Description
The RF analysis of the LCLS-II Gun fundamental power coupler (FPC), including the ceramic window, has been analyzed using SLAC-developed 3D parallel finite-element electromagnetic code suite, ACE3P. Comprehensive multipacting (MP) simulations were carried out to investigate potential discharge regions within the FPC coaxial line and window assembly. The results reveal strong two-point MP between the ceramic disk and the window shielding sleeve at specific input power levels. In addition, the studies show that the external magnets mounted on the two FPC arms can only provide localized suppression of MP within regions influenced by their fringe magnetic fields. Therefore, effective MP mitigation in the LCLS-II FPC relies primarily on TiN coatings applied to the coaxial copper surfaces and ceramic disk, which reduce their secondary electron yield (SEY) below unity. Detailed analysis and findings from the LCLS-II Gun FPC RF simulations are presented.
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