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Update on RB78 and IR6 Interlock Adjustments During LHC Operations - March 26

On Saturday, March 26, significant progress was made with the RB78 issue, now functioning on one thyristor bridge without the active filter. Key activities included changing the LHCb polarity, reconfiguring IR6 interlock BPMs, and conducting various tests. Observations showed expected beam dumps during position adjustments. Important updates were made regarding BPM interlocks, requiring 15+ bunches to trigger activation. A reminder: no ramp with fewer than 80 bunches is permitted until modifications to the interlock settings are completed. Stable beams and new filling schemes were implemented for optimal operation.

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Update on RB78 and IR6 Interlock Adjustments During LHC Operations - March 26

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  1. Saturday 26th March • 9:15 Problem with RB78 temporarily solved. It's running on one Thyristor bridge only and without the active filter • LHCb polarity change • IR6 interlock BPMs reconfiguration and tests • Check IR6 BPMs with 8b per beam: • No interlock for windows completely closed, for both beams, as expected • Checking BPM IR6 intlk with 16b • B1 dumped when moving from 0.75 to 0.25 mm as expected - beam position was +0.5 mm • B2 dumped when moving from 1.21 to 0.71 mm as expected - beam position was +0.8 mm LHC 8:30 meeting

  2. Saturday afternoon • Checking BPM interlock with full pattern and new count/turn settings • Worked OK for B1 and B2 • B1 dumped between +0.13 and -0.37 mm (position was 0.08 mm) • B2 dumped between +1.0 and +0.5 mm (position was +0.55 mm) • OK to fill with new pattern • 16:15 Next 1.38 TeV attempt • Beams dumped (SIS on TCDQ/beam position) • Joerg identified the cause in a BPM which started to develop an offset today. He opened the thresholds to recover the margin • 18:20 Stable beams • bigger emittances (around 3 microns from SPS) • different filling scheme avoiding offset collisions LHC 8:30 meeting

  3. Updated IR6 interlock BPMs Brennan Goddard • bunchCntWin1 changed from 70 to 75; • turnCntWin1 changed from 100 to 5; • Left the other values unchanged • bunchCntWin2 250; turnCntWin2 10 • All position values unchanged. • As a result, the interlock will now only become active when 15 or more bunches are out of tolerance in IR6. • The interlock thus becomes active at injection only when 15 or more bunches are circulating • *** IMPORTANT: NO RAMP OF FEWER THAN 80 BUNCHES ALLOWED UNTIL THE INTERLOCK IS MODIFIED BACK TO THE INITIAL VALUES * LHC 8:30 meeting

  4. 1650 Reyes LHC 8:30 meeting

  5. 1653 – start fill LHC 8:30 meeting

  6. Incoming LHC 8:30 meeting

  7. Noted – Per Hagen Will the “soon to come” fill 1664 be celebrated? with or without crossing angle… LHC 8:30 meeting

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