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Efficient 24-Hour Report: Beam Studies, Aperture Scans, and Instrumentation Checks

This report summarizes the activities and findings from the last 24 hours at the facility, including beam studies, aperture scans, and instrumentation checks. Various tests were conducted to ensure the protection and trajectories of beams, verify aperture limits, and address tune stability issues. The report also covers successful separation bumps, crossing angle tests, and precautions taken during equipment access. Important results and measurements are detailed to showcase the operational efficiency and maintenance efforts.

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Efficient 24-Hour Report: Beam Studies, Aperture Scans, and Instrumentation Checks

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  1. Report Friday 4.12.2009 Very efficient last 24h!

  2. 08:00-13:30: TDI and LBDS studies: Ring injection protection set up for beam2 (+-6.8sigma for TDI, TCLIA, TCLIB plus TDI angle). Protection verified with injection failure tests with beam. Over-injection mode tested: requires some BLM interlocks disabled for this mode. b) Dumpline trajectories verified for beam 1 and beam 2. Dump failure tests with beam. c) IR6 aperture scans with bumps for both beams. No sign of abnormal aperture limits.

  3. 13:30-15:00: Beam instrumentation checks. Q/Q' and coupling measurements. Tune stability issue H plane: tune walks around at 0.001 level.

  4. 15:00-23:00: IR aperture checks. CMS aperture scan is OK. ALICE aperture scan is OK. In ATLAS the V plane is OK (respectively similar to the other experiments). The H plane is 'different' from all other IRs.ATLAS dumped with the BCM on both beams, while the machine BLMs never gave any significant signal (in the V plane the BLMs gave the usual signals): both beam1 and beam2. Went to relatively large amplitudes, even though less than in other IRs.Be careful not to draw hasty conclusions.

  5. CMS (vertical)

  6. ATLAS (vertical)

  7. ALICE (horizontal)

  8. 00:00-07:30: Separation bumps and crossing angle. All bumps switched on individually. No problems (polarity etc). Non-closure and dispersion verified. Luminosity scan knobs tested successfully. Finally at 06:25 all separation bumps and crossing angles (nominal injection values) switched on and both beams injected with NO major losses. IP8 losses not related to IR setup (stayed unchanged). No sign of problems with cross-talk from MCBX’s (nested IP correctors). Orbit saved and bumps removed.

  9. Access: IR6 LBDS IR4 Wire Scanner IR4 undulator Cryo intervention ROD.A45.B2 (replace card)

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