Update on Broadband Impedance of TCTV Collimator and Follow-Up
Update on Broadband Impedance of TCTV Collimator and Follow-Up
Update on Broadband Impedance of TCTV Collimator and Follow-Up
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C<strong>on</strong>clusi<strong>on</strong>s <strong>and</strong> recomentadi<strong>on</strong>s• Transverse impedance <strong>of</strong> the present design (bothBroad B<strong>and</strong> <strong>and</strong> trapped modes) is too high if we trustGdfidL full geometry simulati<strong>on</strong> but acceptable if we trustanalytical estimate <strong>and</strong> parallel plate simulati<strong>on</strong> withGdfidL• Reducti<strong>on</strong> <strong>of</strong> jaw taper angle from 15 to 10(7) degree<strong>and</strong>/or making n<strong>on</strong>-linear taper is not a soluti<strong>on</strong> for thetrapped modes <strong>and</strong> the BB impedance• A possible soluti<strong>on</strong> for reducti<strong>on</strong> <strong>of</strong> impedance <strong>of</strong> thedipole trapped modes by means <strong>of</strong> damping could beopening the l<strong>on</strong>gitudinal slots.• The drawback will be excitati<strong>on</strong> <strong>of</strong> low frequency trappedmodes both m<strong>on</strong>opole <strong>and</strong> dipole which <strong>on</strong> the otherh<strong>and</strong> can be damped efficiently. (to be dem<strong>on</strong>strated)
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