Note that both sim files and the corresponding digi files are available (no spill-over due to filled bunch spacing of 2.025 microsec) .
(sim files produced by G.Corti, digi files produced by M.Needham)
| Conditions | data set location and name | nr of events | ||
| event type | magnetic field | velo position | Files are located in: /castor/cern.ch/lhcb/background/Pilot_2007/ | |
| Prim vtx s(x) = s(y) = 280 microns; horizontal crossing angle = 0 mrad | ||||
| 450 GeV/p, collisions | off | open | 30000000.5k.B_OFF.VeloOpen.{sim,digi} | 4997 |
| 450 GeV/p, collisions | off | intermediate | 30000000.5k.B_OFF.VeloMidway.{sim,digi} | 4999 |
| 450 GeV/p collisions | off | close | 30000000.5k.B_OFF.VeloClose.{sim,digi} | 4998 |
| Prim vtx s(x) = s(y) = 280 microns; horizontal crossing angle = 2.1 mrad | ||||
| 450 GeV/p, collisions | on | open | 30000000.5k.B_ON.VeloOpen.{sim,digi} | 4998 |
| 450 GeV/p, collisions | on | close | 30000000.5k.B_ON.VeloClose.{sim,digi} | 5000 WARNING: ECAL and HCAL were not simulated in these data |
| Gas in Velo -1m < z < 1m; data sets separated for H, C, O; need to be scaled for gas composition in 2007 | ||||
| beam gas, p-H | off | open | ||
| beam gas, p-C | off | open | ||
| beam gas, p-O | off | open | ||
The file catalog above is available as Catalog_Pilot_2007.xml
The spread of the beams is different for the Pilot Run (as presented by Ralph Assamann at LHCb Week in Sept. 2006).
As a result the primary vertex distributions are also different with respect to the nominal running conditions.
The settings of the primary vertex s(x) = s(y) = 280 microns is just that of the beam size (value from R.A. is 277mm at b*=10m, it is 70.9 microns at 7TeV at the same b*)
s(z) should also be different than that of nominal running since bunch length at 450 GeV is 11.24 cm instead of 7.55.
In addition the collisions are head on with magnet off while the beams have a +/- 2.1 mrad angle with full field leading to a difference of luminous region in the case of magnet off/on that should also be taken into account.
Last updated: 03 March 2008