RF QUALITY CONTROL AND CORRECTION DURING THE MANUFACTURING PROCESS OF THE SPL CAVITIES DUMB-BELL TRIMMING POA Meeting Ercan Pilicer, Kai Papke, Sotirios Papadopoulos, Szabina Horvath-Mikulas INTRODUCTION DESIGN f design Half-cell shape design: elliptical arc parameter optimization magnetic and electric boundaries L design |E| max i = |E| max j Magnetic Electric DESIGN FREQUENCY f Pi half-cell (magnetic boundary at iris) f Pi dumb-bell f Pi cavity = = Sole resonator 1 frequency Doubly coupled resonator 2 frequencies Pi phase difference f 0, f Pi Fivefold coupled resonator 5 frequencies Pi/5 phase difference f 0, f Pi/5, f 2Pi/5, f 3Pi/5, f 4Pi/5, f Pi Monopole mode field distribution in each single component of the cavity sub-assemblies Simulation errors Predetermined ambient conditions: 20 degree Celsius Vacuum MANUFACTURING PHASES TO CONTROL I.Half-cells II.Dumb-bells III.Final IV.Final POSSIBLE CORRECTIONS I.Half-cells No possibility II.Dumb-bells Trimming III.Final Tuning machine IV.Final Cold tuner REQUISITES I.Half-cells No possibility Acceptance II.Dumb-bells Trimming Cutting amount III.Final Tuning machine Amount for plastic deformation of the individual cells IV.Final Cold tuner Range for elastic deformation of the overall cavity DUMB-BELL CORRECTION Length Frequency Initial state Target state DUMB-BELL CORRECTION Length Frequency L measured f measured L target f target Initial state Target state CORRECTION BY TRIMMING Length Frequency L measured f measured L target f target Initial state Target state Trimming Correction in 1 direction L Trimming vector TRIMMING OPTION 1 Length Frequency L measured f measured L target f target Initial state Target state Trim to the right length L trim f trim TRIMMING OPTION 2 Length Frequency L measured f measured L target f target Initial state Target state L trim Trim to the right frequency f trim Pushing vector CORRECTION BY TUNING Length Frequency L measured f measured L target f target Initial state Target state Tuning Correction in 2 directions Pulling: L Pushing: L Pulling vector TRIMMING OPTION 3 Length Frequency L measured f measured L target f target Initial state Target state L trim Trim to an intermediate state Pre-tune by pulling L pull f trim f pull TRIMMING OPTION 3 Length Frequency L measured f measured L target f target Initial state Target state L trim L pull f trim f pull TRIMMING OPTION 3 Length L measured f measured L target f target Initial state Target state L trim Trim to an intermediate state Pre-tune by pushing L push Frequency f trim f push TRIMMING OPTION 3 Length L measured f measured L target f target Initial state Target state L trim L push Frequency f trim f push TRIMMING AND TUNING SENSITIVITIES Length Initial state Trimming sensitivity Tuning sensitivity Pulling Pushing Correction Lengths Calculation Frequency TUNING MACHINE STATUS TUNING MACHINE OVERVIEW CAVITY SENSITIVITY FOR SHAPE OUTLINE IMPERFECTIONS -6 kHz/mm/mm 6 kHz/mm/mm0 kHz/mm/mm sensitivity in normal (out of the volume) direction sensitivity in longitudinal direction sensitivity in radial direction REQUISITES I.Plastic Pi-mode frequency change OVER Plastic cell longitudinal displacement -> Tuning sensitivity for trimming (calculated for half-cells) II.System Limit -> Half-cell acceptance III.Elastic Pi-mode frequency change OVER Plastic Pi-mode frequency change (OR the correlation to the displacements) -> Tuning method (required Pi-mode frequency change per half-cell) QUESTIONS I.Where to measure the displacement? -> Cell or cavity II.How does the field distribution influence the sensitivity? -> Field mapping III.Repeatability -> Cell dependence -> Cell initial state dependence -> Tuning cycle dependence IV.How equally the pressure is distributed along the cell circumference and how parallel the plates deform the cell? PREVIOUS MECHANICAL SENSOR SYSTEM Pressure sensorDisplacement sensor UPGRADED MECHANICAL SENSOR SYSTEM Strain gaugesDisplacement sensor MECHANICAL TESTS PREVIOUS MEASUREMENTS (OLD SYSTEM, BEFORE HEAT TREATMENT) CERN SPL COPPER CAV2 CELL3&4 COMPRESSION AND TRACTION TEST CERN SPL COPPER CAV2 CELL3 COMPRESSION AND TRACTION TEST Before and after heat treatment released state CERN SPL COPPER CAV2 CELL4 COMPRESSION AND TRACTION TEST Before and after heat treatment released state TO THE LIMIT FOR CELL4 TO THE LIMIT FOR CELL3 ELASTIC AND PLASTIC CORRELATION CELL3 AND CELL4 ELASTIC AND PLASTIC CORRELATION CELL3 AND CELL4 TO THE LIMITS CELL3 STIFFNESS