LHC 2011 - latest news

Week 35: Machine coordinators: Jan Uythoven and Jorg Wenninger

TS coordination by J. Coupard

TS, recovery from TS, 1 m beta*, Alice polarity change

 

Day

Summary

Link to report from morning meeting

Monday 5th September
  • 00:25 Ramp to check TCT IR2 alignment over ramp
  • 00:45 Collimation alignment TCT IR2 at 3.5 TeV
  • 04:00 Loss maps in collision
  • 04:30 Beam dump after off-momentum loss map
  • 05:50 Ramp for aperture measurements
  • 06:20 Beam lost during squeeze due to trip of RQT - no tune signal
  • 08:50 Ramp for loss maps with TCTs at 14 sigma and nominal bunch

8:30 meeting

Technical Stop Summary

Controls

 

 

Sunday 4th September
  • 01:00 Aperture measurements with colliding beams in Xing plane.
  • 03:00 Loss maps with TCTs at 11.8 + 2 sigmas.
  • 04::00 Refill for aperture measurements.
  • 06:00 Aperture measurements at end of squeeze in separation plane.
  • 07:30 Loss maps with TCTs at 11.8 + 2 sigmas
  • 10:00 Injection - preparing for ALICE polarity reversal. Current polarity -/-
  • 11:00 Ramping down ALICE and switching polarity to +/+.
  • Updating all settings and OFB reference to new NEGATIVE external Xing angle (-170 injection, -80 at 3.5 TeV)
  • 13:00 ALICE to +/+, probes in and corrected
  • 13:30 Setting up injection protection on B1
  • 19:30 Injection protection validation started
  • 20:45 TCT alignment IP2 at injection started

9:00 meeting

Saturday 3th September

·         02:45 First ramp after technical stop

·         06:45 Problems with SPS extraction kicker, no beam for collimator alignment

·         10:30 Beam back

·         12:00 Ramp and squeeze for TCT alignment. Loss spikes delaying start of alignment, traced to RT trims being enabled for the FBs (despite FB being OFF).

·         14:30 TCT alignment starting with separated beams.

·         19:00 TCT alignment done. Loss maps and asynch. dump test with TCTs at 11.8 sigma.

·         00:00 Fill 1 probe/beam for aperture measurements. TCTs in IR1+5 with new functions.

9:00 meeting

Friday 2th September

·         TS Day 5

·         14:30 Cryo Start back for all powering sub-sectors.

·         16:00 Evacuate machine & experiments

·         17:00 Last searches

·         19:00 End of technical stop

·         22:50 Beams injected

8:30 meeting
Restart plan

Thursday 1th September
  • TS Day 4

8:30 meeting

Wednesday 31th August
  • TS Day 3

-

Tuesday 30th August
  • TS Day 2

8:30 meeting
 
  • 01:00 Aperture measurements with colliding beams in Xing plane.
  •  03:00 Loss maps with TCTs at 11.8 + 2 sigmas.
  • 04::00 Refill for aperture measurements.
  • 06:00 Aperture measurements at end of squeeze in separation plane.
  • 07:30 Loss maps with TCTs at 11.8 + 2 sigmas
  • 10:00 Injection - preparing for ALICE polarity reversal. Current polarity -/-
  • 11:00 Ramping down ALICE and switching polarity to +/+.
  • Updating all settings and OFB reference to new NEGATIVE external Xing angle (-170 injection, -80 at 3.5 TeV)
  • 13:00 ALICE to +/+, probes in and corrected.
  • 13:30 Setting up injection protection on B1
  • 19:30 Injection protection validation started
 

Monday 29th August
  • 06:00 start of technical stop,
  • TS Day 1.

8:30 meeting & MD report