A Method to Determine the Electric Field of Liquid Argon Time Projection Chambers Using a UV Laser System and its Application in MicroBooNE

Understand

Liquid argon time projection chambers (LArTPCs) are now a standard detector technology for making accelerator neutrino measurements, due to their high material density, precise tracking, and calorimetric capabilities.

• An electric field (E-field) is required in such detectors to drift ionized electrons to the anode to be collected.
• The E-field of a TPC is often approximated to be uniform between the anode and the cathode planes.
• However, significant distortions can appear from effects such as mechanical deformations, electrode failures, or the accumulation of space charge generated by cosmic rays.