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Saturday 22.05

Saturday 22.05. Stable beams from night 11:30 : PC trip RQTD.A81B2, water problem Access to repair. RSD2.A23B1 trip during access, requires additional access. Trip of RD1.LR5, electrical network perturbation. 19:30 : trip of RF, electrical network perturbation. 20:00 : Access finished

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Saturday 22.05

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  1. Saturday 22.05 • Stable beams from night • 11:30 : PC trip RQTD.A81B2, water problem • Access to repair. • RSD2.A23B1 trip during access, requires additional access. • Trip of RD1.LR5, electrical network perturbation. • 19:30 : trip of RF, electrical network perturbation. • 20:00 : Access finished • 21:40 : injection • B2 emittance increasing rapidly. • Re-injected B2 with (almost) ‘everything’ ready to ramp to minimize emittance growth. 8:30 meeting

  2. Saturday 22.05 • 23:30 : Ramp • Good news : we survived an ‘energy glitch’ event in the FB. • Bad news : the FB does not manage to get back to normal state after the glitch. Enters an endless loop and thinks it is at 1 GeV. All values (kicks, Q corrections) published by the FB are ‘corrupted’. It still manages to correct (respectively not to loose the beam). >> We will have to reboot the server during every pre-cycle to reset the energy (unless we get a ‘far East’ patch…). • 00:15 : Flat top • Huge emittances: B1 4.5 um (H), 7.1 (V) B2 4.5 um (H), 6.4 (V) • Problems to measure Q’ due to the issue with the energy (see above). With 1 GeV, the sign of dp/p changes wrtdfRF and Q’ comes out with the wrong sign !! • Lost B2 while trying to understand Q’ (beam excursion interlock after intensity loss). 8:30 meeting

  3. Sunday 23.05 • 01:30 Ramp down • Reboot FB did gave other issues. >> Decided not to use OFB for next ramp • 06:00 Stable beams at last ! 8:30 meeting

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