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LHC System Maintenance and Updates: Thursday to Friday Overview

This report outlines the LHC system maintenance conducted from Thursday 07:00 to Friday 11:00. Key activities included access system maintenance requiring patrols, deployment of nQPS patches across four sectors (S12, S23, S34, S45), and comprehensive powering tests for validation. Cryode-icing was performed at point 8. Additional updates included modification of DQAMG software thresholds to 800mV and adjustments to extraction switches in sector 34. Machine closed at 01:44 for precycle operations, with performance aligned to expectations.

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LHC System Maintenance and Updates: Thursday to Friday Overview

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  1. Thursday - Friday • 07:00 – Late Access • Thanks again to CSA and RP • Access system maintenance (patrol required), BI, EPC, cryo • nQPSpatch in four sectors (S12, S23, S34, S45) deployment and powering tests for validation • Cryode-icing in point 8 • Started 04:00 Thursday • End ~11:00 Friday • 01:44 Machine closed • start precycle of available sectors • RQD/F in sector 12 were tripping during the "COMBO" cycle because the reference magnets are "slightly" mixed up..... LHC status

  2. nQPS • Summary of the modifications:1) Update of DQAMGs software for 4 sectors (12, 23, 56 and 67). This includes change of threshold to 800mV. The new parameters were verified by the QPS team • Behaves as expected • 2) Change of the delay of the extraction switches in sector 34 by 100ms (in total, 8 cards were modified) • Not sufficient LHC status

  3. Schedule LHC status

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