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The image MuonWithFullLAT shows the distribution of energy deposited in the calorimeter when a muon goes through it. This is a typical image. The muon deposites energy (11.2 MeV in average) in a crystal from each layer. A clear track is visualized, and consequently the direction of the muon event can be (up to some precision) reconstructed for a large fraction of the events using only information from the calorimeter. The distributions of the variables Trk1ZDir and CalZDir are shown in MuonSLACReconstruction.gif, MuonSLACReconstruction.ps and MuonSLACReconstruction.root (gif, ps and root files). Note that (for this data and selection applied) the muon direction in the calorimeter (CalZDir) is properly reconstructed for most of the events, as expected.
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The calibration of this run is not perfect, yet it is roughly ok, within 10-20% (estimated from the location of the muons peaks). I took this run because the calibration seems to be much better than in dedicated muon runs (700000276 to 286, 700000490 to 500). Details about this quick evaluation of the calibration constants can be found in the following two references:
- https://confluence.slac.stanford.edu/download/attachments/13893/Paneque_BeamTest_20060718.pdf?version=1
- https://confluence.slac.stanford.edu/display/BeamTest/CAL+Energy+Calibrations
The image MuonWithFullLAT MuonWithCUshows the distribution of energy deposited in the calorimeter when a muon goes through it. This is a typical image; not a rare event. Note that the track is "brocken"; every other layer there is a "hole" in the track, the energy deposited in that layer seems to show up off the track. The FRED Images 1,2,3 and 4 show the first 4 consecutive events from that run (after the application of the selection criteria described above). You can see the same behaviour in all them. The FRED image Evt4_4Views shows the event 4 from 4 different perspectives. Note that
. The muon deposites energy (11.2 MeV in average) in a crystal from each layer. A clear track is visualized, and consequently the direction of the muon event can be (up to some precision) reconstructed for a large fraction of the events using only information from the calorimeter. The distributions of the variables Trk1ZDir and CalZDir are shown in MuonSLACReconstruction.gif, MuonSLACReconstruction.ps and MuonSLACReconstruction.root(gif, ps and root files). Note that (for this data and selection applied) the muon direction in the calorimeter (CalZDir) is properly reconstructed for most of the events, as expected.
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