Results from single unit-cell simulations Nasrin Esfahani 29.11.2016 SPS 200 MHz HOM Meetings

Motivations Reducing simulation time Fast evaluation of modifications to HOM couplers ϕ=90° Single unit-cell

Motivations ϕ=90° Fast evaluation of modifications to HOM couplers Representative of the real cavity when all slots are filled with a specific HOMs ϕ=90° Single unit-cell

Examining Q, Rsh/Q, Rsh comparison

690 MHz 659 MHz 628 MHz Coupler 628 MHz Coupler

Freq Freq-loaded Q Q-loaded R/Q R/Q-loaded Rsh Rsh-loaded 602.2 593.9 55151 6 1E-04 0.175 7 1 627.4 625.4 34986 21 19.61 13.06 686562 273 631.8 629.5 75670 68 0.0012 5.832 97 397 660.2 656.8 53771 15 0.003 2.311 136 34 661.2 659.6 70985 49347 1.002 70468 687.1 686.9 93733 406 22.02 23.93 2066886 9726 690.6 690.3 107747 101985 7E-05 319 8 698.8 699.5 61830 295 0.001 1.514 62 446

E-field pattern Freq Freq-loaded Q Q-loaded R/Q R/Q-loaded Rsh Rsh-loaded 631.8 629.5 75670 68 0.0012 5.832 97 397

E-field pattern Freq Freq-loaded Q Q-loaded R/Q R/Q-loaded Rsh Rsh-loaded 631.8 629.5 75670 68 0.0012 5.832 97 397

E-field pattern Freq Freq-loaded Q Q-loaded R/Q R/Q-loaded Rsh Rsh-loaded 698.8 699.5 61830 295 0.001 1.514 62 446

E-field pattern

Freq Freq-loaded Q Q-loaded R/Q R/Q-loaded Rsh Rsh-loaded 602.2 593.9 55151 6 1E-04 0.175 7 1 627.4 625.4 34986 21 19.61 13.06 686562 273 631.8 629.5 75670 68 0.0012 5.832 97 397 660.2 656.8 53771 15 0.003 2.311 136 34 661.2 659.6 70985 49347 1.002 70468 687.1 686.9 93733 406 22.02 23.93 2066886 9726 690.6 690.3 107747 101985 7E-05 319 8 698.8 699.5 61830 295 0.001 1.514 62 446

Freq Freq-loaded Q Q-loaded R/Q R/Q-loaded Rsh Rsh-loaded 627.4 625.4 34986 21 19.61 13.06 686562 273

H-field pattern

Freq Freq-loaded Q Q-loaded R/Q R/Q-loaded Rsh Rsh-loaded 687.1 686.9 93733 406 22.02 23.93 2066886 9726

H-field pattern

Outlook Examining the single unit-cells equipped with (938 MHz and 460 MHz) coupler Identifying the modes that are not damped Damping strategies through modifying the existing couplers