1 / 12

Thursday 10.6

Thursday 10.6. Plan for the day: Night from Wed-Thursday: Ramp optimization. Morning: Controlled longitudinal emittance blow-up. Afternoon: Transverse feedback system commissioning. Night: Squeeze commissioning & preparation for collimation set-up at 3.5 TeV

Download Presentation

Thursday 10.6

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. Thursday 10.6 • Plan for the day: • Night from Wed-Thursday: Ramp optimization. • Morning: Controlled longitudinal emittance blow-up. • Afternoon: Transverse feedback system commissioning. • Night: Squeeze commissioning & preparation for collimation set-up at 3.5 TeV • 06:30 : Medium intensity ramp – 8E10 • Looks much better than one nominal bunch. • Emittances of 3mm at start of ramp, 5mm at end of ramp. • Colliding at b* = 10 m. Coupling around 2 10-3. • Stable collisions, lifetimes 25-125 hours. B2V emittance to 10mm, other planes stable. • Luminosity 4 1028cm-2 s-1 in ATLAS and CMS (1 colliding pair).  with 1.2 1029cm-2 s-1 with b* = 3.5 m  could reach 1 1030cm-2 s-1 with 8 bunches 8 1010, b* = 3.5 m. 8:30 meeting

  2. Orbit and Tune Correction during Ramp 8:30 meeting

  3. Bunch length during ramp 8:30 meeting

  4. 1 Colliding pair of 8E10, b* 10 m 8:30 meeting

  5. Thursday 10.6 • 10:15 : End of fill • 12:00 : New injection7e10 per beam for RF studies • 13:13: MPS problem in PS, no beams for a while • 15:30: PS and SPS ready again for new injections • 15:50: SPS preparing for high intensity beams with increased long. emittance • 16:45: Injection of high intensities into LHC • 17:20 : New ramp – 8E10 • 17:30: lost 2B2 and 3B2 cavities leading to bad beam lifetime (7h compared to 170 h for Beam1) and increased bunch length. • Beam2 cavities keep tripping after resets! • continuous losses in IR3 and IR7 (large emittances) • The B1 bunch length evolved as designed and reached 1.5 ns. 8:30 meeting

  6. Thursday 10.6 • 18:45 : Collapsing separation bumps: • ATLAS: BRAN rate = 550 Hz; Luminosity 3.8 1028cm-2 s-1 • CMS: BRAN rate = 770 Hz; Luminosity 3.8 1028 cm-2 s-1 • Attempt to collapse separation bump in ALICE leads to beam losses • 19:30 : Dumped both beams to prepare new fill for damper studies • Beam dump of Beam 2 gives XPOC error. Probably due to un-bunched beam caused by RF problems • 20:43 : QPS not OK for RB.A23 • requires access; QPS communication problem on MB29.R2 • tracked down to a bad contact  access finished at 00:00. • 01:30 ; Pre-Cycle finished 8:30 meeting

  7. Bunch length during second ramp 8:30 meeting

  8. Beam losses during second ramp 8:30 meeting

  9. 1 Colliding pair of 8E10, second ramp 8:30 meeting

  10. Friday 10.6 • 02:30 : Starting Damper studies • The new firmware for the multi-bunch feedback had a negative side effect (programming of coarse delay not working) which means one cannot advance with it. • 05:00 : Start preparing new fill for Collimator setup • problems with PS-SPS synchronization jitter • some problems in SPS with longitudinal beam blow-up • Program for today: • Morning: Collimator setup at 3.5 TeV. • Afternoon: Controlled longitudinal emittance blow up on ramp. • Night: Transverse damper studies • Saturday morning: Collimatorsetup at 3.5 TeV. 8:30 meeting

  11. Friday 10.6 • Open Issues: • RCD.A45B2 and RCBXH1.R1  require QPS board change (running on board B) • MKI in IR2 and IR8 require access for updating the timing synchronization 8:30 meeting

  12. Program for the next 2 weeks ✔ LMC report

More Related