Main Linac Klystron based RF powering system Availability

Main Linac Klystron based RF powering system Availability Studies for Odei Rey Orozco

Availability studies for CLIC Klystron based powering scheme Input: Model definition • System hardware description • Failure modes and failure effects • Maintenance strategies Output: Simulation results • Availability estimations • Failure frequencies • Main Downtime contributors • Spare management

Klystron based powering scheme Availability simulations Klystron based powering scheme availability model Generates the input files for the target software Availability simulation software ( Monte Carlo simulations) 22/01/2022 4

Klystron based powering scheme Availability simulations, first results 22/01/2022 5

Klystron based powering scheme Availability simulations, first results 22/01/2022 6

Klystron based powering scheme Model definition: Hardware description Total of 1500 units (per linac) LLRF KLY 150 Hot standby spares MOD Wave guide Tunnel separation ACC Cooling Other components? 16 loads Implemented redundancy? Alignment 22/01/2022 7

Klystron based powering scheme Model definition: Failure modes and failure effects • Each element can be assigned a failure mode(s) with a MTTF and then can be fixed with MTTR • One can define the failure effects / consequence of the failure. LLRF KLY MOD Wave guide Tunnel separation 16 loads ACC Cooling 22/01/2022 Alignment 8

Klystron based powering scheme Model definition: Failure modes and failure effects 1) 2) 3) 4) 5) 6) 7) 8) Name of failure mode: Failure mechanism of the component? Mean Time To Fail: How often does it fail? Can the failure mode occur when system down? Mean Time To Repair Do we need to access the tunnel to fix the failed component? Do we need an spare part to fix the failed component? When is the repair done? As soon as the failure occurs or off-line? Can repairs be done simultaneously? 1) 2) 3) 22/01/2022 4) 5) 6) 7) 8) 9

Klystron based powering scheme Model definition: Failure modes and failure effects When a failure occurs: If hot standby spares available -> replace failed module w/o causing downtime? If no spares available -> stop the machine -> perform repairs? Access time to tunnel? RF POWERING SYSTEM Restart time = 8 h Access time = 8 h Restart time? RF MODULE Restart time = 8 h Access time = 8 h 22/01/2022 10

Next steps Klystron based powering scheme • Agree on failure modes and failure parameters • Perform simulations and sensitivity analysis • Analyse the impact of technical stops in availability

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Klystron based powering scheme Model definition: Hardware description Total of 1500 units (per linac) RF POWERING SYSTEM LLRF KLY -Amplifier Restart time = 8 h Access time = 8 h KLY Modulator Wave guide / Pulse compressor / Loads Tunnel separation Accelerating structure ( 8 cavities) Cooling system Vacuum system Alignment system Restart time = 8 h Access time = 8 h RF MODULE 22/01/2022 13

Klystron based powering scheme Model definition: Failure modes and failure effects 1) 2) 3) 4) 5) 6) 7) 8) Name of failure mode: Failure mechanism of the component? Mean Time To Fail: How often does it fail? Can the failure mode occur when system down? Mean Time To Repair Do we need to access the tunnel to fix the failed component? Do we need an spare part to fix the failed component? When is the repair done? As soon as the failure occurs or off-line? Can repairs be done simultaneously? 1) 2) 22/01/2022 3) 4) 5) 6) 7) 8) 14