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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TCLIA/<strong>TCTV</strong> broad b<strong>and</strong>transverse impedanceA. Grudiev17.02.2006RLC meeting
TCLIA/<strong>TCTV</strong> geometryMax gap: 60mmMin gap (TCLIA Graphite):12mmMin gap (<strong>TCTV</strong> Tungsten): 3mm
GdfidL results for different mesh <strong>and</strong> integrati<strong>on</strong> algorithms15 o -linear taper
It is not a soluti<strong>on</strong> for dipole trapped modesJaw taper shape optimizati<strong>on</strong>15 o - linear taper10 o - linear taper10 o - n<strong>on</strong>-linear taper
GdfidL results for different taper angleIt is not a soluti<strong>on</strong> for broad b<strong>and</strong> impedance
GdfidL results for different taper angle <strong>and</strong> typeIt is not a soluti<strong>on</strong> for broad b<strong>and</strong> impedance
GdfidL results for 14 o -linear taper, parallel plate geometry35 kOhm/m BB impedance
Analytical EstimateYokoya (1990): BB impedance for circular geometry: ~20 kΩ/m=> for parallel plate: ~ 35 kΩ/mStr<strong>on</strong>g indicati<strong>on</strong> that there is a bug in GdfidL simulati<strong>on</strong>for BB transvese impedance
Dipole trapped mode damping with 4S60 ferriteRemove Sliding rf c<strong>on</strong>tact
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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