1 / 6

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

manasa
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related