Date post: | 27-Mar-2015 |
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Primo (e ultimo ?) giorno di fascio a LHC
Nuovo Logo di CMSvalido almeno fino allaprossima primavera:
Beam Splash: ~2.109 protons on collimator ~150 m upstream of CMSECAL- pink; HB,HE - light blue; HO,HF - dark blue; Muon DT - green; Tracker Off
CMS Week Sep08 4
Other Distributions: Beam Dumped in Coll.
Energy in ECAL (EE-, EB, EE+)
CMS Week Sep08 5
First Events: Beam going through CMS
Beam Pickup (ch1) CMS Beam Condition Monitors (ch 3, 4) Point 5 Control Room
CMS Centre Meyrin
Halo Muons in CSCs and HB
First LHC Beam in DT System
DT and first beams: beam splash17 events induced by beam 1 dump on the collimators observed in run 61642
DT are far from being the best tool to detect first beams events.
Max number of hits/TDC = 16 in the DAQ. For splash events all TDC are fired -> >300 hits in inner stations.
No segment reconstruction if > 50 hits -> no segments reconstructed in inner stations.
100% of the MB1chambersilluminatedin all 17 events
10/04/23 7
MB2 Occupancy
MB3 Occupancy
MB4 Occupancy
Phi asymmetry
Correlation DT – EB energy
Beam halo in DT
DT and first beams:beam halo
10/04/23 15
MB1 occupancy: # digis/SL
--- All SLs--- r-ϕ SLs--- r-z SLs
beam halo muonscross few cells of r-ϕSLs but many cells in r-z