Abstract
Large liquid argon time projection chambers (LArTPCs), especially those operating near the surface, are susceptible to space charge effects. In the context of LArTPCs, the space charge effect is the build-up of slow-moving positive ions in the detector primarily due to ionization from cosmic rays, leading to a distortion of the electric field within the detector. This effect leads to a displacement in the reconstructed position of signal ionization electrons in LArTPC detectors (“spatial distortions”), as well as to variations in the amount of electron-ion recombination experienced by ionization throughout the volume of the TPC. We present techniques that can be used to measure and correct for space charge effects in large LArTPCs by making use of cosmic muons, including the use of track pairs to unambiguously pin down spatial distortions in three dimensions. The performance of these calibration techniques are studied using both Monte Carlo simulation and MicroBooNE data, utilizing a UV laser system as a means to estimate the systematic bias associated with the calibration methodology.
Highlights
Measurement of space charge effects in the MicroBooNE liquid argon time projection chambers (LArTPCs) using cosmic muons To cite this article: P
Shown in figure and figure are the measurements of the offsets from the Time projection Chambers (TPC) faces discussed in section 4.2 for Monte Carlo simulation events and data events, respectively; the offset of 4.5 cm associated with the gap between the field cage and instrumented TPC volume is not included in the raw data measurement shown in figure 11, as it is applied at a later stage of the calibration
Cosmic muon tracks reconstructed in the MicroBooNE TPC have been shown to be useful in measuring spatial distortions due to underlying electric field non-uniformities throughout the detector
Summary
Measurement of space charge effects in the MicroBooNE LArTPC using cosmic muons To cite this article: P. We present techniques that can be used to measure and correct for space charge effects in large LArTPCs by making use of cosmic muons, including the use of track pairs to unambiguously pin down spatial distortions in three dimensions. The performance of these calibration techniques are studied using both Monte Carlo simulation and MicroBooNE data, utilizing a UV laser system as a means to estimate the systematic bias associated with the calibration methodology. : Detector modelling and simulations II (electric fields, charge transport, multiplication and induction, pulse formation, electron emission, etc); Noble liquid detectors (scintillation, ionization, double-phase); Performance of High Energy Physics Detectors; Time projection Chambers (TPC)
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