Hayama ILC Lecture, , Shuichi Noguchi 1 Part III ILC BCD Cavity  Maximum Use of Potential Performance  Maximum Use of each Cavity Performance  Maximum Availability

Hayama ILC Lecture, , Shuichi Noguchi 2 Problems of Cavity for ILC Application  Large Scatter of Maximum Gradient  Large Dynamic Lorentz Detuning  Long MTBF for Critical Components > 20 years ---  < 5 % ／ year  Maximum Use of Potential Performance  Maximum Use of each Cavity Performance  Maximum Availability

Hayama ILC Lecture, , Shuichi Noguchi 3 Common Numbers are necessary  Number of Spare Cryomodules < 30  How many modules can we replace in a scheduled shutdown ?  MTBF / Life Time ?  How many critical component in a cryomodule ?  Number of cavities to be repaired in a year < ?  How is the lowest gradient we have to operate ?  Distribution of the Max. Gradient Where do we set the threshold gradient ?

Hayama ILC Lecture, , Shuichi Noguchi 4 ILC BCD Cavity Parameters ILC BCD Cavity I=10mA, 1.5msec. X 5HzACD IdeaProblem Comments MaterialNiobium BulkWell Established Nb/Cu Clad, Single Crystal Frequency1.3GHz Lower Frequency Operating Temperature2 k Number of Cell9 >9, Super Structure Gradient31.5 MV/m Performance Scatter35 MV/m Duty1.5 msec. X 5 HzPulse OperationDynamic Lorentz Detuning Cell ShapeElliptical Low loss Iris Aperture70 mm Smaller Aperture Wall Thickness2.8 mm Need Stiffener Input CouplerDouble Window CoaxialTunable CouplingComplexMany Candidates HOM Coupler High Pass + λ/ ４ Filter Compact Jacket Not Stiff Tuner Not StiffMany Candidates Magnetic ShieldOutside of JacketHigh Temperature Treatment Inside of Jacket Vacuum SealAl Alloy Hexagon

Hayama ILC Lecture, , Shuichi Noguchi 5 DESY Cavity Support System is weak.

Hayama ILC Lecture, , Shuichi Noguchi 6 Scatter of Maximum Gradient

Hayama ILC Lecture, , Shuichi Noguchi 7 First TestBefore Installation After Installation Gradient Distribution

Hayama ILC Lecture, , Shuichi Noguchi 8 Lorentz ( Maxwell ) Detuning Ｋ ｊａ ｃｋｅｔ Ｋ tuner Ｋ cavity FF Ｆｚ Ｆｒ TESLA Blade STF Slide Jack STF Ball Screw AHz/(MeV/m) BN/(MeV/m) df/dlHz/μm dF/dlN/μm331.8 KSN/μm KjacketN/μm KtunerN/μm Δf (30MV/m)Hz Fine Tuning Stroke μm

Hayama ILC Lecture, , Shuichi Noguchi 9 Mechanical Oscillation Modes Multi-cell Mode (I) f = 87 Hz Multi-cell Mode (II) f = 169 Hz Tuner Mode f = 294 Hz Single-cell Mode f = 3.91 kHz ９７２ MH Cavity Tuner

Hayama ILC Lecture, , Shuichi Noguchi 10 Stiff Jacket Baseplate (Ti) Thick Titanium Baseplate No Stiffener 2.8 t 3.5 t

Hayama ILC Lecture, , Shuichi Noguchi 11 Dynamic Lorentz Detuning Results at TTF  Pkly < 10 % → Detuning angle < 12 deg.,  f < 46Hz

Hayama ILC Lecture, , Shuichi Noguchi 12 TTF Lever Arm Tuner Top Heavy

Hayama ILC Lecture, , Shuichi Noguchi 13 TTF Blade Tuner

Hayama ILC Lecture, , Shuichi Noguchi 14 Slide Jack Tuner Piezo Stack Drive Shaft Taper Invar Rod Roller

Hayama ILC Lecture, , Shuichi Noguchi 15 Tuner and Jacket Input Coupler Port Piezo Stack Slide Jack Drive Shaft Titanium Jacket Support Base Invar Rod 2K He Line Motor Outside Piezo Replacement OK

Hayama ILC Lecture, , Shuichi Noguchi 16 A prototype coaxial ball screw tuner

Hayama ILC Lecture, , Shuichi Noguchi 17 Input Coupler

Hayama ILC Lecture, , Shuichi Noguchi 18 TTF-3 Coupler

Hayama ILC Lecture, , Shuichi Noguchi 19

Hayama ILC Lecture, , Shuichi Noguchi 20 Input Coupler for Baseline Cavity 5K cooling here 80K cooling here Beam pipe Warm window Door-knob conversion Cold window Vacuum port TRISTAN Type Coaxial Disk Ceramic 80 K 5 K 2 K Static Loss 5 W 1.1 W 0.05 W Dynamic Loss 3 W 0.2 W 0.03 W Qext = 2.0 x 10 6 Prf = 350 kW An improved input coupler design for simplicity with no tuning mechanism.

Hayama ILC Lecture, , Shuichi Noguchi 21 Components for High Power Test Stand Input CouplersDoorknobs Coupling Waveguides

Hayama ILC Lecture, , Shuichi Noguchi 22 Coupler Opening Piezo can be replaced

Hayama ILC Lecture, , Shuichi Noguchi 23 HOM Coupler

Hayama ILC Lecture, , Shuichi Noguchi 24 Gradient Control

Hayama ILC Lecture, , Shuichi Noguchi 25

Hayama ILC Lecture, , Shuichi Noguchi 26 Input Power Error Coupling Error Tuning Error Phase Error Cavity Voltage Error & Gain Reduction Beam Phase

Hayama ILC Lecture, , Shuichi Noguchi 27 Item Device Pros Cons Cost Power Variable Divider Power Efficient Can be equipped after Necessary for other Cavities Second Divider Can be equipped after Space, Not Power Efficient Q in Tunable Coupler Complicated Can not be equipped afterwards 3-Stube Tuner Can be equipped after Performance Measurement 3-MotorsMost Expensive  Phase Shifter Can be equipped after Performance Measurement

Hayama ILC Lecture, , Shuichi Noguchi 28 Rough Cost 30%50%70%100%  Control Replace by Fix WG Need U-Part Replace by Tunable WG Manual Replace by Tunable WG Remote PowerAdd Second DividerFix Need Space Manual Remote Replace DividerFix*** Manual*** Remote*** Coupling Add 3-Stub TunerFix Need Space Manual All from the beginning Remote Tunable CouplerManual*** All from the beginningRemote***