Yasmine Amhis EPFL- 23-11-09 Yasmine Amhis EPFL 22-11-09 Status
of the LHC and LHCb Adrenaline
Slide 2
Most (all ) of the content of this status report is heavily
stolen from various sources (Tuesday meeting, Run minutes, Evian
conference.)
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The LHC accelerating chain LHC Linac: 50 MeV Booster:1 GeV PS:
26 GeV SPS: 450 GeV LHC something? To follow up :
http://op-webtools.web.cern.ch/op-
webtools/Vistar/vistars.php?usr=LHC1
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The LHC cryptic monitoring
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SPS injects beam in the LHC LHC
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Repairs (status on the 16.11.09 at 10:00 AM) 1.14 quadrupole
magnets replaced. 2.39 dipole magnet replaced. 3.54 electrical
interconnections fully repaired. 4.Over 4 km of vacuum beam tube
cleaned 5.Nearly 900 new helium pressure release ports are being
installed around the machine. 6. 6500 new detectors are being added
to the magnet protection system. LHC
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Month OP scenari o Max numbe r bunch Proton s per bunch Min
beta* Peak Lumi Integra ted % nomin al 1 Beam commissioning 2 Pilot
physics combined with commissioning 433 x 10 10 48.6 x 10 29 ~200
nb -1 3435 x 10 10 42.4 x 10 30 ~1 pb -1 41565 x 10 10 21.7 x 10 31
~9 pb -1 2.5 5a No crossing angle 1567 x 10 10 23.4 x 10 31 ~18 pb
-1 3.4 5b No crossing angle pushing bunch intensity 1561 x 10 11
26.9 x 10 31 ~36 pb -1 4.8 6 Shift to higher energy: approx 4 weeks
Would aim for physics without crossing angle in the first instance
with a gentle ramp back up in intensity 7 4 5 TeV (5 TeV luminosity
numbers quoted) 1567 x 10 10 24.9 x 10 31 ~26 pb -1 3.4 8 50 ns
nominal Xing angle 1447 x 10 10 24.4 x 10 31 ~23 pb -1 3.1 9 50 ns
2887 x 10 10 28.8 x 10 31 ~46 pb -1 6.2 10 50 ns 4327 x 10 10 21.3
x 10 32 ~69 pb -1 9.4 11 50 ns 4329 x 10 10 22.1 x 10 32 ~110 pb -1
12 LHC Plans
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Utility of beam events Coarse Timing. Finding z-location of
interaction point in all experiments. Beam stability and
background. First Switch on with beam. Rates from beam halo. Beam
Gas Global and local fine timing and space alignment. LHC b
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Collisions at 450 GeV Hope to start with 5 10 10 per bunch. If
rates and life time allows, try van der Meer scan as soon as
possible. First fill(s) without LHCb magnet and then, as soon as
useful, with field Aim to finish year with (parts of) VELO (out but
on) and field ! Trigger strategy No bias/minimum bias interaction
trigger with anti-cosmic. Start out in TAE if still needed after
Single Beam run with RICH in spying mode. Calibration triggers at
50 Hz. Luminosity triggers for test purposes at 50 Hz total. HLT in
pass all mode. VELO alley and triggers needed to test closing
procedure and measuring luminous region. Seems a very slim hope to
get collisions above 450 GeV before Christmas Hope (minimum
ambition) is high to achieve ramp of single and perhaps two beams.
Collisions at 1.1 TeV. LHC b
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Run news: 22.11.09. 9:00 AM minutes from Rolf Linder. LHC &
LHC b LHC & LHC b o From 20h30 to 21h00, the LHC delivered
quite beam 1 (QB1) with: Up and running: Calorimeters, OT, Muons,
VELO (one module each side). o From 23h00 to 23h30, QB1 : Joined :
IT (1 box), TT (one layer C side), VELO (5 modules per side). o
About a 100 beam gas events were recorded.
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LHC b Offline reconstructed beam gas events 22.11.09 at 08:31
PM the date were distributed To tier-1 sites.
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Splashes at LHCb LHC b
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Le reste du monde LHC Splashes at ATLAS & CMS
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Conclusion, 23.11.09 at 8:08 PM The possibility to have
collision in the coming 24 hours is becoming serious. The
management of LHCb is in contact with the LHC coordination, and we
should get more news around 9 PM. A meeting is then organised in
the control room at 9:30 with all SDs to agree on the strategy.
Velo (Stefano+Karol), ST(Abraham), OT(Antonio), RICH(Greig), Calo
(Marie-Noelle), Muon (Sandro) and L0 (Patrick) have been
contacted.
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After discussion with all SD and the management, the following
strategy has been a greed: - LHC will inject only ONE bunch per
beam. Colisions are then either ATLAS+CMS or LHCb or Alice. - We
are interested to look at these possib le collisions, and all 'big'
detectors are rea dy to go to nominal voltage, with some care. This
means RICH, OT, Calo and Muon. - We wont turn ON the silicon
detectors (Velo, ST) - If/when LHC will announce that they will
proviode collisions for us, the shift crew should call,the Run
Chief, the Commissioning Coordinator, and all the SD coordinators
excluding Conclusion, 23.11.09 at 10:10 PM