Yasmine Amhis EPFL- 23-11-09

Yasmine AmhisEPFL

22-11-09

Status of the LHC and LHCb Adrenaline

Most (all …) of the content of this status report is heavily stolen from various sources (Tuesday meeting, Run minutes, Evian conference….)

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

The LHC cryptic monitoring

SPS injects beam in the LHC

LHC

LHC

LHC

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 cleaned5. 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

Month

OP scenario Max number bunch

Protons per bunch

Min beta*

Peak Lumi Integrated % nominal

1 Beam commissioning

2 Pilot physics combined with commissioning 43 3 x 1010 4 8.6 x 1029 ~200 nb-1

3 43 5 x 1010 4 2.4 x 1030 ~1 pb-1

4 156 5 x 1010 2 1.7 x 1031 ~9 pb-1 2.55a No crossing angle 156 7 x 1010 2 3.4 x 1031 ~18 pb-1 3.4

5b No crossing angle – pushing bunch intensity 156 1 x 1011 2 6.9 x 1031 ~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

74 – 5 TeV (5 TeV luminosity numbers quoted) 156 7 x 1010 2 4.9 x 1031 ~26 pb-1 3.4

8 50 ns – nominal Xing angle 144 7 x 1010 2 4.4 x 1031 ~23 pb-1 3.1

9 50 ns 288 7 x 1010 2 8.8 x 1031 ~46 pb-1 6.210 50 ns 432 7 x 1010 2 1.3 x 1032 ~69 pb-1 9.4

1150 ns

432 9 x 1010 2 2.1 x 1032 ~110 pb-1 12

LHC

Plans

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.

LHCb

Collisions at 450 GeV• Hope to start with 5 ×1010 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.

LHCb

Run news: 22.11.09. 9:00 AMminutes from Rolf Linder.

LHC&

LHCb

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.

LHCb

Offline reconstructed beam gas events22.11.09 at 08:31 PM the date were distributed To tier-1 sites.

Splashes at LHCb

LHCb

Le reste

du monde

LHC

Splashes at ATLAS & CMS

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.

• After discussion with all SD and the management, the following strategy has been agreed: - 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 ready 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

BACKUP SLIDES

LHC cooling

Beam dump