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Beam Injection and Stability Report – May 22, 2012

On May 22, 2012, we successfully managed beam injections and sorted out collimator issues. Stable beams were achieved, with Luminosity peaking at 5.8 x 10^33 cm^-2s^-1. An average intensity of 1.43 x 10^11 was noted at injection, despite significant intensity variations. A total of 205 pb^-1 was delivered to ATLAS and CMS during operational hours. We faced a beam dump early Wednesday due to operator intervention, followed by re-injections that were complicated by SPS bunch length issues. Continuous monitoring and maintenance are essential for ongoing performance.

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Beam Injection and Stability Report – May 22, 2012

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  1. Tuesday 22.5.2012

  2. Tuesday • 6:30 injection beam after collimator problems sorted out • 7:17 dump by interlock BPMs: pilot being excited by theinjection cleaning  Switched off injection cleaning for the third injectionfor the next fill. • 8:48 – 4: 24 stable beams fill# 2651 • 5.8 1033 cm-2s-1peak Luminosity • 1.43 1011 average bunch intensity at injection – rather big variations • Delivered 205 pb-1average to Atlas and CMS in 19:35 hours

  3. 15:18 the B1 bunches #1, #2 and #4 all of a sudden experienced a sharp loss (collisions in IP8 only)

  4. Bunch intensities and losses after 15 h collisions

  5. Wednesday Morning • 4:24 beam dumped by operator • 6:00 re-injecting lengthened by issues with the SPS bunch length • 8:00 filling again

  6. Varia • The request for abort gap cleaning was changed from 5e9 to 1e10 for beam 1 only. • BSRT and especially the AGM: closing of application should not affect operation • Take Soft Start data immediately after a beam dump at full energy when the MKIs are close to or above the MKI temperature interlock threshold • Take measurements (manual at the time being) head-tail monitor – investigate automatic triggering, possibly on BBQ amplitude • Vacuum will need an access to repair a pumping group in S45 (not urgent)

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