LHC 2011 - latest news
Week 49 Machine coordinators: J. Wenninger, B. Holzer (sick !)
Goals of the week: Pb-Pb physics, Quench test
Link to report from morning meeting
Thursday 8th Dec
- RP survey.
- Xmas technical stop.
General access in all points except Pt 3 & 7.
Wednesday 7th Dec
- 01:30 New attempt of
ramp with modified blow-up - failed again.
- 03:00 STABLE BEAMS
#2350 Initial luminosity 4x1026
- 03:40 Beam dumped,
- 08:40 STABLE BEAMS
#2351 Initial luminosity 4x1026
- 10:20 Beam dumped,
- Precycle. A few RF
trips in the 'shadow'.
- 14:00 Refill for
- 14:45 Beam dumped at
end of injection due to trip of RF module M1B2.
- 15:00 Not worth to
refill - end of physics for 2012 !!!
- Attempt to test the
combined ramp and squeeze: failed due to absence of beam. The ion beam is
lost between extraction of PS and injection into the SPS. Despite desperate
efforts, it was not possible to restore the ion beam in the SPS.
- 18:00 End of LHC run
- 18:30 Switching off
all circuits. LHC to access mode.
Tuesday 6th Dec
- 06:00 Dump fill 2344.
- QPS problem on
B10.L2. Reset OK. Precycle.
- Quench test with
- 3 attempts - no
- 16:00 Preparing for
- ADT gating test for
BBQ - not successful.
- 18:00 Ramp lost due
to problem with longitudinal blowup settings.
- 20:00 New ramp, again
new blow-up failed, bunches became way too long at the start - problem with
FB on bunch length.
- 21:00 STABLE BEAMS
#2349 Initial luminosity 4x1026
- 22:40 Beam lost, trip
of RF module M2B1.
Monday 5th Dec
- 03:15 STABLE BEAMS
#2343 Initial luminosity 5x1026
- 09:30 Dump fill 2343.Integrated
luminosity ~6 ub-1.
- Ion quench test
- 11:00 Beam scraping
at injection for CMS.
- 12:00 Electrical
glitch due to fault on 18kV circuit breaker. Lost 4 sectors, RF, MKIs,
ATLAS. Collimators in strange state.
- 12:30 Second glitch
when trying to switch back on. Lost cryo Pt18 as a consequence of the second
- Waiting for cryo
- 18:00 Cryo Pt18
recovered well ahead of initial prediction (24:00).
- Preparing for
- 20:00 Injecting.
- 23:00 STABLE BEAMS
#2344 Initial luminosity 4.5x1026