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Published byLynn James Modified over 9 years ago
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RF QUALITY CONTROL AND CORRECTION DURING THE MANUFACTURING PROCESS OF THE SPL CAVITIES “DUMB-BELL TRIMMING” POA Meeting 11.03.15 Ercan Pilicer, Kai Papke, Sotirios Papadopoulos, Szabina Horvath-Mikulas
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INTRODUCTION
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DESIGN f π design Half-cell shape design: elliptical arc parameter optimization magnetic and electric boundaries L design |E| max i = |E| max j Magnetic Electric
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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
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MANUFACTURING PHASES TO CONTROL I.Half-cells II.Dumb-bells III.Final cavity @warm IV.Final cavity @cold
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POSSIBLE CORRECTIONS I.Half-cells No possibility II.Dumb-bells Trimming III.Final cavity @warm Tuning machine IV.Final cavity @cold Cold tuner
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REQUISITES I.Half-cells No possibility Acceptance II.Dumb-bells Trimming Cutting amount III.Final cavity @warm Tuning machine Amount for plastic deformation of the individual cells IV.Final cavity @cold Cold tuner Range for elastic deformation of the overall cavity
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DUMB-BELL CORRECTION Length Frequency Initial state Target state
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DUMB-BELL CORRECTION Length Frequency L measured f measured L target f target Initial state Target state
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CORRECTION BY TRIMMING Length Frequency L measured f measured L target f target Initial state Target state Trimming Correction in 1 direction f↑ @ L↓ Trimming vector
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TRIMMING OPTION 1 Length Frequency L measured f measured L target f target Initial state Target state Trim to the right length L trim Δf trim
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TRIMMING OPTION 2 Length Frequency L measured f measured L target f target Initial state Target state L trim Trim to the right frequency Δf trim
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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: f↑ @ L↑ Pushing: f↓ @ L↓ Pulling vector
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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 Δf trim Δf pull
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TRIMMING OPTION 3 Length Frequency L measured f measured L target f target Initial state Target state L trim L pull Δf trim Δf pull
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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 Δf trim Δf push
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TRIMMING OPTION 3 Length L measured f measured L target f target Initial state Target state L trim L push Frequency Δf trim Δf push
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TRIMMING AND TUNING SENSITIVITIES Length Initial state Trimming sensitivity Tuning sensitivity Pulling Pushing Correction Lengths Calculation Frequency
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TUNING MACHINE STATUS
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TUNING MACHINE OVERVIEW
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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
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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)
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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?
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PREVIOUS MECHANICAL SENSOR SYSTEM Pressure sensorDisplacement sensor
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UPGRADED MECHANICAL SENSOR SYSTEM Strain gaugesDisplacement sensor
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MECHANICAL TESTS
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PREVIOUS MEASUREMENTS (OLD SYSTEM, BEFORE HEAT TREATMENT)
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CERN SPL COPPER CAV2 CELL3&4 COMPRESSION AND TRACTION TEST
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CERN SPL COPPER CAV2 CELL3 COMPRESSION AND TRACTION TEST Before and after heat treatment – released state
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CERN SPL COPPER CAV2 CELL4 COMPRESSION AND TRACTION TEST Before and after heat treatment – released state
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TO THE LIMIT FOR CELL4
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TO THE LIMIT FOR CELL3
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ELASTIC AND PLASTIC CORRELATION CELL3 AND CELL4
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ELASTIC AND PLASTIC CORRELATION CELL3 AND CELL4 TO THE LIMITS
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CELL3 STIFFNESS
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