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Sunday 23.05

Sunday 23.05. Stable beams from 6am. Ramp was done without OFB Emittances large at injection (particularly B2V) and then grow Last wirescans made at 11.25 B1h 7.2 B1v 9.6 B2h 6.0 B2v 11 Beams lost at 12.35 Traced to a tracking error on B1 MKD, generator L

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Sunday 23.05

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  1. Sunday 23.05 • Stable beams from 6am. Ramp was done without OFB • Emittances large at injection (particularly B2V) and then grow • Last wirescans made at 11.25 • B1h 7.2 B1v 9.6 • B2h 6.0 B2v 11 • Beams lost at 12.35 • Traced to a tracking error on B1 MKD, generator L • As there is built-in redundancy, expert masked the channel, but an intervention will be done at the next occasion. There is probably a problem on a sensor. • Ready to inject around 14.00 • BQM extraction inhibit; LHC probe beam almost not visible on mountain range display. Longitudinal structure missing. PS RF. • Pilots injected around 16.00 8:30 meeting

  2. Sunday 23.05 • Measured and corrected orbit, Q, Q’, injection oscillations and phase • Done using bucket 2001 • Fill for physics. But did not inject into bucket 1 • Emittance measurement (without bucket 1)B1 H : 2.4 B1 V : 2.4B2 H : 3.6 B2 V : 3.5 • Dump and fill for physics • Emittance measurements (with bucket 1)B1 H : 2.4 B1 V : 2.6B2 H : 2.8 B2 V : 5.1 • Seems tha all bunches are OK except for bucket 1 • Ramp for physics around 18.00 • Stable beams 21:30 – good lumi • Problem to ovelap beams in ATLAS. Large offset in H, just within the tolerance. • To be looked at in the next fill – need bare correction to clean. 8:30 meeting

  3. Monday 24.05 • 00:30: Lost beams – internal dump LBDS • 04:00 Ready gain – new internal dump LBDS at injection. • Access required to fix power trigger • 09:00 Ready to go again… 8:30 meeting

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