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Maximizing Cavity Performance and Availability for ILC Applications

Explore strategies for optimizing performance, maintenance, and reliability of cavities in ILC accelerators. Topics include spare cryomodules, component replacement, MTBF, gradient thresholds, and detuning control.

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Maximizing Cavity Performance and Availability for ILC Applications

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  1. Part IIIILC BCD Cavity • Maximum Use of Potential Performance • Maximum Use of each Cavity Performance • Maximum Availability Hayama ILC Lecture, 2006.5.23

  2. 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 ? Hayama ILC Lecture, 2006.5.23

  3. DESY Hayama ILC Lecture, 2006.5.23

  4. ILC BCD Cavity Parameters Hayama ILC Lecture, 2006.5.23

  5. Problems of Cavityfor 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, 2006.5.23

  6. Scatter of Maximum Gradient Hayama ILC Lecture, 2006.5.23

  7. Gradient Distribution First Test Before Installation After Installation Hayama ILC Lecture, 2006.5.23

  8. Lorentz ( Maxwell ) Detuning Ｋｊａｃｋｅｔ Ｋtuner Ｆｒ Ｋcavity F F Ｆｚ Hayama ILC Lecture, 2006.5.23

  9. Mechanical Oscillation Modes ９７２MH Cavity Multi-cell Mode (I) f = 87 Hz 1/9 p Mode Tuner Multi-cell Mode (II) f = 169 Hz 2/9 p Mode Tuner Mode f = 294 Hz Single-cell Mode f = 3.91 kHz Hayama ILC Lecture, 2006.5.23

  10. Dynamic Lorentz Detuning Results at TTF DPkly < 10 % →Detuning angle < 12 deg. , Df < 46Hz Hayama ILC Lecture, 2006.5.23

  11. Stiff Jacket Baseplate (Ti) 2.8 t 3.5 t Thick Titanium Baseplate No Stiffener Hayama ILC Lecture, 2006.5.23

  12. TTF Lever Arm Tuner Top Heavy Hayama ILC Lecture, 2006.5.23

  13. TTF Blade Tuner Hayama ILC Lecture, 2006.5.23

  14. A prototype coaxial ball screw tuner Hayama ILC Lecture, 2006.5.23

  15. Slide Jack Tuner Drive Shaft Invar Rod Piezo Stack Taper Roller Hayama ILC Lecture, 2006.5.23

  16. Tuner and Jacket Motor Outside Piezo Replacement OK 2K He Line Invar Rod Support Base Titanium Jacket Drive Shaft Slide Jack Piezo Stack Hayama ILC Lecture, 2006.5.23 Input Coupler Port

  17. Input Coupler • Double Window • to prevent Catastrophe due to Window Break • To close the cavity in the clean room • Tuneability ? Hayama ILC Lecture, 2006.5.23

  18. TTF-3 Coupler Hayama ILC Lecture, 2006.5.23

  19. Hayama ILC Lecture, 2006.5.23

  20. Input Coupler for Baseline Cavity An improved input coupler design for simplicity with no tuning mechanism. TRISTAN Type Coaxial Disk Ceramic Warm window Cold window Beam pipe 5K cooling here Door-knob conversion 80K cooling here Vacuum port 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 106 Prf = 350 kW Hayama ILC Lecture, 2006.5.23

  21. Coupling Waveguides Components for High Power Test Stand Input Couplers Doorknobs Hayama ILC Lecture, 2006.5.23

  22. Coupler Opening Piezo can be replaced Hayama ILC Lecture, 2006.5.23

  23. HOM Coupler Hayama ILC Lecture, 2006.5.23

  24. Gradient Control Hayama ILC Lecture, 2006.5.23

  25. Vg VC VCW Vb Vf t Hayama ILC Lecture, 2006.5.23

  26. Coupling b Dependence of Vacc Hayama ILC Lecture, 2006.5.23

  27. Detuning Angle Hayama ILC Lecture, 2006.5.23

  28. Cavity Voltage Error & Gain Reduction Input Power Error Coupling Error Tuning Error Phase Error Beam Phase Hayama ILC Lecture, 2006.5.23

  29. Hayama ILC Lecture, 2006.5.23

  30. Hayama ILC Lecture, 2006.5.23

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