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Friday 23.7

Friday 23.7. Morning: struggling to get back from Technical Stop Problems related to function generation for 10 A/ s pre-cycle. Problems related to Inner Triplet magnets in IR8  change optical fiber Problems with QHPS in sector 45  needed to change the switch.

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Friday 23.7

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  1. Friday 23.7 • Morning: struggling to get back from Technical Stop • Problems related to function generation for 10 A/s pre-cycle. • Problems related to Inner Triplet magnets in IR8  change optical fiber • Problems with QHPSin sector 45 needed to change the switch. • 10:00: Starting pre-cycle of all circuits: • Problems closing the switches in S78 (arc magnets tripped): S78 had been switched off at the end of the pre-cycle directly without going through standby by the previous shift crew  ca 200 A left in the circuit. • Problems closing the switches for the RQTFcircuits (worked after several attempts). • ATLAS solenoid ramping up • Problems with orbit in SPS: studies ongoing all morning • Triplet in IR2 left tripped during pre-cycle • FMCM fault in Q5 IR3 -> repair requires magnet to be switched off. • Still some problems when loading pre-cycle functions (RQD-RQF). 8:30 meeting

  2. Friday 23.7 • 11:00: Problem in the SPS traced to magnet short  repair implies no beam for the LHC over the next 24 hours. • Will precycle and run Dry runs in the LHC until Saturday noon. • 12:00: Start Dry runs in the machine • Pre-cycle with 10 A/sis OK (IT L2 needed some tune-up). • Dry-run went though first time without problems (4 in total). • New ramp-down combo gave some problems for triplets, some RCBW and some RCDcircuits. • Short access for repair of CMS short. • BPM System Upgraded to include temperature correction. 8:30 meeting

  3. Saturday 24.6 • SPS magnet repaired but have potential issue with vacuum at extraction kicker (piquet called) • RF problem in the PS  requires access (couple hours). • Plan for the day and weekend once beam becomes available: • Beam dump and IR6 BPM tests at 450 Gev. • Ramp of single pilot bunch per beam with beam dump test at 3.5 TeV. • test ramp of single nominal (0.9 1011) bunch per beam; SMP; full cycle, optic verification (AC dipole); loss maps for collimation verification. • Saturday-Sunday night: Fill with 13 bunches per beam with stable physics. • Sunday morning: multi bunch injection studies. • Sunday evening: Fill and ramp with 25 bunches per beam with stable beams if possible. 8:30 meeting

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