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The HL-LHC upgrade requires flexible approaches to collimator vacuum conditioning, addressing both operational performance and the maintenance constraints for highly activated equipment. This work develops a methodology combining machine development studies with material outgassing measurements and pressure profile simulations to optimize conditioning procedures for collimators installed in the long straight section of LHC point 7 (LSS7).
End-of-Fill tests during the LHC machine development run were performed to establish the maximum acceptable pressure levels for safe operation, through direct monitoring of beam losses during the gradual increase of pressure in LSS7. Additionally, collimator outgassing studies were conducted following various vacuum conditioning/bakeout procedures, coupled with pressure profile analyses to meet the pressure criteria defined by the LHC tests. This would enable a more simplified bakeout procedure consistent with ALARA requirements, reducing intervention complexity and radiation exposure for personnel, while ensuring adequate vacuum performance.
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