1. Shuichi NoguchiHayama ILC Lecture, 2006.5.231 Part III ILC BCD Cavity  Maximum Use of Potential Performance  Maximum Use of each Cavity Performance  Maximum Availability

2. Shuichi NoguchiHayama ILC Lecture, 2006.5.232 Common Ｉｍａｇｅ is necessary  How many Spare Cryomodules ?  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 ?

3. Shuichi NoguchiHayama ILC Lecture, 2006.5.233 DESY

4. Shuichi NoguchiHayama ILC Lecture, 2006.5.234 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 JacketNb Endplate + Ti CylinderHigh Temperature TreatmentNot StiffTi Thick Endplate Tuner Stiffness, ReliabilityMany Candidates Magnetic ShieldOutside of JacketHigh Temperature Treatment Inside of Jacket Vacuum SealAl Alloy Hexagon

5. Shuichi NoguchiHayama ILC Lecture, 2006.5.235 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

6. Shuichi NoguchiHayama ILC Lecture, 2006.5.236 Scatter of Maximum Gradient

7. Shuichi NoguchiHayama ILC Lecture, 2006.5.237 First TestBefore Installation After Installation Gradient Distribution

8. Shuichi NoguchiHayama ILC Lecture, 2006.5.238 Lorentz ( Maxwell ) Detuning Ｋ ｊａ ｃｋｅｔ Ｋ tuner Ｋ cavity FF Ｆｚ Ｆｒ TESLA BladeSTF Slide JackSTF Ball Screw AHz/(MeV/m) 2 0.5 1.2 BN/(MeV/m) 2 0.047 0.051 df/dlHz/μm320 370 dF/dlN/μm331.8 KSN/μm138060 KjacketN/μm269658 KtunerN/μm265001700 Δf (30MV/m)Hz14906201360 Fine Tuning Strokeμm3.712.9

9. Shuichi NoguchiHayama ILC Lecture, 2006.5.239 Mechanical Oscillation Modes Multi-cell Mode (I) f = 87 Hz 1/9  Mode Multi-cell Mode (II) f = 169 Hz 2/9  Mode Tuner Mode f = 294 Hz Single-cell Mode f = 3.91 kHz ９７２ MH Cavity Tuner

10. Shuichi NoguchiHayama ILC Lecture, 2006.5.2310 Dynamic Lorentz Detuning Results at TTF  Pkly < 10 % → Detuning angle < 12 deg.,  f < 46Hz

11. Shuichi NoguchiHayama ILC Lecture, 2006.5.2311 Stiff Jacket Baseplate (Ti) Thick Titanium Baseplate No Stiffener 2.8 t 3.5 t

12. Shuichi NoguchiHayama ILC Lecture, 2006.5.2312 TTF Lever Arm Tuner Top Heavy

13. Shuichi NoguchiHayama ILC Lecture, 2006.5.2313 TTF Blade Tuner

14. Shuichi NoguchiHayama ILC Lecture, 2006.5.2314 A prototype coaxial ball screw tuner

15. Shuichi NoguchiHayama ILC Lecture, 2006.5.2315 Slide Jack Tuner Piezo Stack Drive Shaft Taper Invar Rod Roller

16. Shuichi NoguchiHayama ILC Lecture, 2006.5.2316 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

17. Shuichi NoguchiHayama ILC Lecture, 2006.5.2317 Input Coupler  Double Window  to prevent Catastrophe due to Window Break  To close the cavity in the clean room  Tuneability ?

18. Shuichi NoguchiHayama ILC Lecture, 2006.5.2318 TTF-3 Coupler

19. Shuichi NoguchiHayama ILC Lecture, 2006.5.2319

20. Shuichi NoguchiHayama ILC Lecture, 2006.5.2320 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.

21. Shuichi NoguchiHayama ILC Lecture, 2006.5.2321 Components for High Power Test Stand Input CouplersDoorknobs Coupling Waveguides

22. Shuichi NoguchiHayama ILC Lecture, 2006.5.2322 Coupler Opening Piezo can be replaced

23. Shuichi NoguchiHayama ILC Lecture, 2006.5.2323 HOM Coupler

24. Shuichi NoguchiHayama ILC Lecture, 2006.5.2324 Gradient Control

25. Shuichi NoguchiHayama ILC Lecture, 2006.5.2325 t VCVC VbVb VgVg VfVf V CW

26. Shuichi NoguchiHayama ILC Lecture, 2006.5.2326 Coupling  Dependence of Vacc

27. Shuichi NoguchiHayama ILC Lecture, 2006.5.2327 Detuning Angle

28. Shuichi NoguchiHayama ILC Lecture, 2006.5.2328 Input Power Error Coupling Error Tuning Error Phase Error Cavity Voltage Error & Gain Reduction Beam Phase

29. Shuichi NoguchiHayama ILC Lecture, 2006.5.2329 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

30. Shuichi NoguchiHayama ILC Lecture, 2006.5.2330 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***