UNSPECIFIED (2019) A Method to Determine the Electric Field of Liquid Argon Time Projection Chambers using a UV Laser System and its Application in MicroBooNE. Other. UNSPECIFIED.
Full text not available from this repository.Abstract
Liquid argon time projection chambers (LArTPCs) are today a standard detector technology for accelerator neutrino measurements, due to their high density, precise tracking, and calorimetric capabilities. An electric field (E-field) is required in such detectors to drift ionization electrons to the anode to be collected. The E-field of a TPC is often assumed to be uniform between the anode and the cathode. However, significant distortions can appear from effects such as mechanical distortions, failures, or the accumulation of space charge generated by cosmic rays. The latter is particularly relevant for detectors placed near the Earth’s surface and with large drift distances. To determine the E-field in situ, an ultraviolet (UV) laser system is installed in the MicroBooNE experiment at Fermi National Accelerator Laboratory. The purpose of this system is to provide precise measurements of the E-field, and to make it possible to correct for 3D spatial distortions due to E-field non-uniformities. Here we describe the methodology developed for deriving spatial distortions, the drift velocity and the E-field from UV-laser measurements.