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Progress Report on Physics Fill 1295 with 48 Bunches per Beam – August 20, 2023

On August 20, 2023, the LHC completed a successful physics fill with 48 bunches per beam, achieving an integrated luminosity of 240 nb⁻¹ after 16 hours of stable beams. The operation commenced with a filled beam containing 4.5 x 10¹² protons per beam. Emittance measurements showed average values of ex = 4.4 mm and ey = 4.9 mm. The day included tasks such as luminosity scans, orbit feedback tests, and addressing cryogenic problems. Upcoming issues involve CMS cooling and maintenance of ion pumps.

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Progress Report on Physics Fill 1295 with 48 Bunches per Beam – August 20, 2023

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  1. Friday 20.8. • Morning: First physics fill with 48 bunches per beam: • 20:30: Injection finished  4.5 1012 protons per beam in 48 bunches; ex1 = 2.9 mm; ey1 = 2.9 mm; ex2 = 3.3 mm; ey2 = 3.5 mm; • 21:00: Start ramp; • 21:40: End ramp; • 22:20: Start Squeeze Initial luminosity: L = 6.65 1030 cm-2 sec-1; • 23:30: Stable physics; L = 6.15 1030 cm-2 sec-1;  fitted average emittances for bunch current of Nb = 9 1010: • s= 4.05mm; with b* = 3.6m (average of three 1/b* measurement in IR5) integrated luminosity = 240 nb-1 after 16 hours; 8:30 meeting

  2. Firday 19.8. • 48 bunches in both beams: integrated Luminosity of more than 240 nb-1 8:30 meeting

  3. Thursday 19.8. • 48 bunches in both beam: beginning of the fill. 8:30 meeting

  4. Firday 19.8. • Beam 1 bunch distribution at end of fill: 8:30 meeting

  5. Firday 19.8. • Beam 1 bunch distribution at end of fill: 8:30 meeting

  6. Fill 1295 • 16 hours of stable beams • first 48 + 48 • IPs:1 5 2 8 - 1 58 - 1 5 2 • - 1 5 - 2 8-8 giulia papotti (BE/OP/LHC) giulia papotti (BE/OP/LHC)

  7. Fill 1295 1 LR in 2 (33m) 1 LR in 2 (33m) 1 LR in 8 (33m) 1 LR in 8 (33m) 1 LR in 2 (22m) 1 LR in 2 (22m) no Long Range interactions with Long Range • IPs:1 5 2 8-1 58-1 5 2-1 5 -2 8- 8 giulia papotti (BE/OP/LHC) giulia papotti (BE/OP/LHC)

  8. Firday 19.8. • Very clean dump by operator switch: 8:30 meeting

  9. Friday 20.8. • End of Fill studies: • Luminosity scans in all IPs (large scan in IP1); • Damper studies; • Orbit feedback test for radial loop correctio; • 16:15: Beam dump; very clean & without any unusual losses 8:30 meeting

  10. Firday 19.8. • Lumi scans in IR1: • average beam emittances: ex = 4.4mm ey = 4.9mm • growth of 10% to 20% over the fill! 8:30 meeting

  11. Saturday 21.8. • Morning until noon: • Recovery from cryo problem in Pt6. • Afternoon and over night: • New physics fill with 48 on 48 bunches. • Sunday to Monday: • Physics Fills with 48 bunches per beam. 8:30 meeting

  12. Week 33 • Open Issues for next Technical Stop: • CMS cooling for central tracker. • Ion pumps in dump line MKB (B2 only 4 out of 8 pumps working; few days intervention). • BLM racks (in buildings SR1 and SR5 and both at position BY02): would like to correct the way the power cable for the multi-plug arrives inside the rack. • QPS boards: several boards had to switch from channel A to B. • Access team to replace oxydized connectors for PAD-PX24 (3 hours). • CV needs to replace a motorization of the water valve of the sector 56 (3h). • RCBH18.R7B2 – Miguel CerqueiraBastos. 8:30 meeting

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