Online Reconstruction Plots Descriptions¶

Online Reconstruction TOF plot descriptions¶

• nSpacePoints
  • tof_nSpacePoints.png
  • Number of reconstructed space points in a particle event
  • Most of the events should have 1 space point. If the plot is dominated by 0 space-points, something could be wrong with the space point reconstruction.

• SpacePoints_X, SpacePoints_Y
  • tof_SpacePoints_X.png
  • tof_SpacePoints_Y.png
  • 1d X,Y positions of the reconstructed space points.
  • The mean X and Y should correspond to the the TOF pixel along the beam

• SpacePoints_XY_TOF0, ...TOF1, ..TOF2
  • tof_SpacePoints_XY_tof0.png
  • tof_SpacePoints_XY_tof1.png
  • tof_SpacePoints_XY_tof2.png
  • Y vs X distribution of reconstructed space points in TOF0,1,2
  • Some pixels on the wings might be empty due to beam profile/statistics.
  • If there are empty pixels that look suspicious - eg. empty pixel surrounded by populated neighboring pixels, check the SlabHits_X/Y distributions and look for the slabs corresponding to these pixels.

• SlabHits_X, SlabHits_Y
  • tof_SlabHits_X.png
  • tof_SlabHits_Y.png
  • X, Y postions (slab numbers) of the slabs that were hit.
  • These are the hits which are used to reconstruct space points.
  • Expect the mean to correspond to the slab# aligned with the beam.
  • Holes in the distribution should also have been picked up by the space-point plots. If there's reason to suspect a slab, look further at the pmtHits_ plots

• pmtHits_Plane...
  • tof_pmtHits_Plane0PMT0.png
  • tof_pmtHits_Plane0PMT1.png
  • tof_pmtHits_Plane1PMT0.png
  • tof_pmtHits_Plane1PMT1.png
  • individual pmt hits in each slab/plane/station.
  • These are the PMT hits which go into making a 'slab hit'
  • In these plots,
    • plane0 => refers to X ie. horizontal slabs
    • plane1 => refers to Y ie. vertical slabs
    • PMT0 => refers to north (south) PMTs on horizontal (vertical) slabs
  • eg. pmtHits_Plane0PMT0: shows the north-side PMTs that were hit in the horizontal slabs and pmtHits_Plane1PMT1 shows the south-side PMTs hit in the vertical slabs.
  • Typically both PMTs in a slab would register a hit; so, a hole in the distribution could be suggesting inefficient or dead channels.

• time_tof0-1, time_tof0-2, time_tof1-2
  • tof_time_tof0-tof1.png
  • tof_time_tof0-tof2.png
  • tof_time_tof1-tof2.png
  • Time-of-flight between TOF0->TOF1, TOF0->TOF2, TOF1->TOF2
  • In the TOF0->TOF1 plot, electrons should show up at ~26ns

Online Reconstruction Ckov Plot Description¶

• Ckov arrival times
  • imageCkovArrivalTimes_PMT1-8.png
  • Arrival time of hits on each cerenkov PMT
  • Ckov A is PMT 1-4
  • Ckov B is PMT 5-8

• Ckov charge
  • imageCkovCharge_PMT1-8.png
  • Charge deposited on PMTs (integrated ADCs)
  • Ckov A is PMT 1-4
  • Ckov B is PMT 5-8

• Photoelectron yields vs time of flight
  • imageCkovPE_A_vs_TOF_0_to_1.png
  • imageCkovPE_B_vs_TOF_0_to_1.png
  • Requires calibrated TOF
  • High light yield indicates high velocity particles