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00:10 Beam 2 captured
00:07 Beam 2 has made 150 turns
23: 53 Beam 2 has completed the ring
23:10 Welcome Beam 2
22:00 Beam 1 captured; more than 10 000 000 turns
21:30 Beam 1 has made more than 500 turns of the LHC.
20:30 Beam 1 has completed the ring
19:00 Beam ante portas: LHC beam 1 has arrived on the dump 100 m upstream of ALICE. First splash events were recorded; beam is now passing through ALICE on its way around the ring.
"If all goes well, we’ll start injecting particles into the LHC tonight" said CERN Director General Rolf Heuer
17:30 Friday 20 November 2009 : The operators are preparing the LHC and will attempt to circulate the first beam. This can happen at any time, day or night! #LHC #CERN
Events from the SPD (21:00, run 101136). Interactions of stray particles in the Silicon Pixel Detector during circulating beam.
More splash events. Left : from run 101134, showing reconstructed clusters in the SPD; middle : from run 101136, showing raw hits from SPD; left : from run 101138, with more detectors read out.
Splash event (event 36 run 101134 20:31:39 20-11-2009) showing reconstructed clusters in the Silicon Pixel Detector (the only detector that was on). The beam passes through a screen placed at about 300 m from ALICE.
In ALICE there is a mood of anticipation; after a long shutdown we are looking forward to starting up with the long awaited beams.
The figure on the left shows tracks in the PHOS from muons produced when the LHC beam was dumped upstream of ALICE (Event 3 Run 101109). Z is the direction of the beam. The ALICE PHOS (Photon Spectrometer) is a high resolution electromagnetic calorimeter designed to detect and measure the energy of photons produced in proton-proton and nucleus-nucleus collisions. Each module (photograph on the left) consists of 56 x 64 lead-tungstate crystals. Although primarily designed to study photons, PHOS is also sensitive to charged particles.