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LHC Beam Operations Summary: Challenges and Tests (Last Night)

Last night's LHC operations included various tests and challenges. The TDI X-ray and TED checks were completed, but the MKI injection beam interlock test could not be performed due to SPS beam loop issues. Vacuum interventions were noted, and vacuum gauge problems were addressed. Subsequent tests showed ramp squeezing and collision circuits functioning without problems, though a few RF cavities tripped. Open issues included vacuum leaks and circuit loading problems, with updates on commissioning currents and LBDS tests.

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LHC Beam Operations Summary: Challenges and Tests (Last Night)

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  1. Last night • 12:00 TDI Xray finished • 13:00 TED check finished • 14:00 Beam Loop closed • 14:30 Not possible to perform the injection beam interlock test for MKI • SPS Beam LOOP open due to Vacuum intervention. • 14:30 Continue LBDS tests in the LHC ring • 18:30 Access Vacuum gauge problem on MKI8 finished. • 19:00 Vacuum interlock tests finished. • 19:17 Ramp squeeze and collision all circuits without problems. • 20:00 Switch ON Exp’s compensator RBWMDV.L2 faulty • 22:30 Collimators through the ramp and squeeze • While loading injection settings, sector 81 did not load as one circuit timed out:RCBV13.L1B1 • RF cavity ACSMOduleM1B2 tripped. According to cryo it was a small quench

  2. Last night • High-Beta squeeze still some problem when loading the function. • Totem settings ok for the nominal injection.

  3. Open issues • SPS Vacuum leak in Ba1 • Vacuum level 1E-5 Bar • RCBXH1.L1 • ramp rate changed to 4.5 > 3.5 A/sec • Acceleration 0.25 > 0,2 A/sec^2 • RQTD/F circuits unable to load ramp/squeeze function • RQF/RQD require higher commissioning current for high beta (50 A) LSA table updated • Now at from 6400 >> 6450 A • Exp’s compensator RBWMDV.L2 faulty • 2 final tests for LBDS & Kicker to be operational

  4. Lbds test •  12:00 Synchronisationof injection and AGK tests (EC, WB)-          • 13:00 Injection BETS checks and Soft Start limits tests (MB, WB)

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