Follow-up on tilt of triplet magnets

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The HiLumi LHC Design Study is included in the High Luminosity LHC project and is partly funded by the European Commission within the Framework Programme.

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Follow-up on tilt of triplet magnets M. Giovannozzi, R. Tomás Acknowledgements: A. Herty, H. Mainaud Durand, D. Missiaen 14/09/2010 LHC Beam Commissioning - MG

LHC Beam Commissioning - MG Recap of situation Alignment data (tilt angle) of triplet quadrupoles made available in August (ABP-SU): Large tilt observed in IR5/8 (up to 0.6 mrad). Rogelio made the analysis of the impact: 40% of the coupling observed in IR5 can be explained by the measured tilt. 10% of the coupling observed in IR8 can be explained by the measured tilt. A new measurement campaign took place to confirm the results announced in August. 14/09/2010 LHC Beam Commissioning - MG

LHC Beam Commissioning - MG 14/09/2010 LHC Beam Commissioning - MG

LHC Beam Commissioning - MG 14/09/2010 LHC Beam Commissioning - MG

Summary of tilt measurements IR8 IR1R IR2 IR5 IR1L 14/09/2010 LHC Beam Commissioning - MG

LHC Beam Commissioning - MG Conclusions Large tilt errors confirmed in recent SU measurement campaign. IR5 and IR8 feature the largest tilts. Setting the re-alignment threshold to 0.2 mrad gives the following 7 quadrupoles to re-align: Q3L5, Q2L5, Q3R5 Q2L8, Q1L8, Q1R8, Q2R8 Re-alignment can be performed remotely This might need to re-check IR bumps and other settings (e.g., injection for IR8). 14/09/2010 LHC Beam Commissioning - MG