1. SPL tuning bench: status and results Kai/Waqas

2. Setup Resonance frequency  S11/S21 Measurement Field Flatness  Bead Pull Displacement measurements 12345 Strain Gages Input Port Pick-up Bead NamePieces 1-MX840A QuantumX: DAQ module 1 1-WI/10MM-T Mini displacemnt transduc. WI/10mm,probe 4

3. Sensitivity Analysis x – under strain o - released Elastic limits vary from cell to cell due to pre-treatments and increase which each cycle  plastic deformation range reduces (at the moment  f < 30 kHz for all cells) Elastic limits

4. Bead Size Trade-off between sensitivity and linear phase error S21 one measurements for different bead sizes and a network analyser that gets sick stepBead size [mm]Lin. phase error* 17.958.68% 25.720.04% 36.875.31% 46.22.90% *Linear phase error based on a fit with arctan function and compared with linear function

5. Tuning Procedure Initial state of the Cavity Field flatness of 22 % Resonance Frequency: 703.106 MHz 1 Bead pull measurementFrequency Correction Tuning to 703.2MHz decided due to limited deformation

6. Tuning Procedure 1

7. Initial Cell 4 compressed Cell 1 compressed Cell 2/4 pulled

8. Summary Tuning procedure elaborated and tested heat treatment of the Cu Cavity (reset elastic limits) Further tuning of the test cavity afterwards End cells should be tuned at the end Upgrade of tuning bench yes/no? Maximum frequency shift per cell +-170 kHz