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LHC Status Thursday Morning 27-Sep Bernhard Holzer, Joerg Wenninger

LHC Status Thursday Morning 27-Sep Bernhard Holzer, Joerg Wenninger. 7:00h restart, plan: test fill 78 x 78 for physics 10:00h first bunches (6 + 36 ) in ... but ... vacuum problems in MKI8_D as after 36 bunch injection the threshold is overpassed a second injection is

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LHC Status Thursday Morning 27-Sep Bernhard Holzer, Joerg Wenninger

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  1. LHC Status Thursday Morning 27-Sep Bernhard Holzer, JoergWenninger 7:00h restart, plan: test fill 78 x 78 for physics 10:00h first bunches (6 + 36 ) in ... but ... vacuum problems in MKI8_D as after 36 bunch injection the threshold is overpassed a second injection is vetoed by the SIS threshold for SIS 2E-9 LHC 8:30 meeting

  2. WedMorning different test to understand / overcome the problem: (M. Barnes) * solenoid currents: 0 ... 3 ... 10 A -> no influence * dump of beam 1 -> no influence * patience .... pressure reduces exponentially hypothesis: e-clouds in beam 2 ceramic chamber inside MKI8_D LHC 8:30 meeting

  3. WedMorning 12:48h preparing 78 bunch fill two 36 injections afap before vacuum reaches interlock level conditioning clearly visible 13:00h ramp, squeeze, adjust 13:45h stable beams 72 36 36

  4. WedLate • 15:30h beam mode adjust: some end-of-fill studies • * local bumps for BSRT 2 alignment • * octupole tuning for lifetime • * β-tron loss maps in beam 1 & 2 • 18:00h beam dump, precycle for new fill 456 x 456 • ... after some conditioning of MKI8_D • steering of transferline beam 1 LHC 8:30 meeting

  5. WedLate 21:30h injection & MKI8 conditioning 2*36 bunches 1*72 bunches ... scrubbing with n*144 bunches 4E-10 2E-10 2E-9 1E-9

  6. WedNight 00:08h test for physics injection injected 6 bunch, 144 bunch, 144 bunch, 72 bunch on beam 2 before the vacuum interlock on MKI8. continuous injection / conditioning of up to 5* 144 bunches 05:41h cryo temperature sensor faul on DFBXG_L8 (circuit RQSX3.L8). reset or access needed current b2 pressure

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