  The Deep Underground Neutrino Experiment (DUNE) is a long-baseline neutrino
experiment designed to mainly investigate oscillation parameters, supernova
physics and proton decay. Its far detector will be composed of four liquid
argon time projection chamber (LArTPC) underground modules, in South
Dakota-USA, which will detect a neutrino beam produced at Fermilab, 1300 km
away, where a near detector will be in place. The second DUNE far detector
module, Vertical Drift, will be a single phase LArTPC with electron drift along
the vertical axis with two volumes of 13.5 m x 6.5 m x 60 m dimensions
separated by a cathode plane. The charge collection will be performed by two
anode planes placed at the top and bottom of the module, each composed by
stacked layers of a perforated PCB technology with electrode strips. The photon
detection system (PDS) will make use of large size X-Arapuca tiles distributed
over three detection planes. One plane will consist of a horizontal arrangement
of double sided tiles installed on the high voltage cathode plane and two
vertical planes, each placed on the longest cryostat membrane walls. A light
active coverage of 14.8% over the cathode and 7.4% over the laterals should
allow improvements in the low energy physics range that can be probed in DUNE,
especially regarding supernova neutrinos (~10 MeV). We present the initial
characterization of the Vertical Drift PDS using a Monte Carlo simulation and
preliminary studies on its reconstruction capabilities at the MeV scale. The
information obtained with the PDS alone should allow determination of a
neutrino interaction region with a precision of at least 65 cm for events with
deposited energy above 5 MeV and the deposited energy can be reconstructed with
precision better than 10%, both at the center of the volume.
