  DUNE is a new international experiment for neutrino physics and nucleon decay
searches. It will consist of two detectors, about 1300 km apart, exposed to a
multi-megawatt neutrino beam that will be built at Fermilab. One of the two
detectors will be installed several hundred meters downstream of the neutrino
production point with the primary role of characterising the energy spectrum
and composition of the beam as well as performing precision measurements of
neutrino cross sections. For the design of this so-called near detector, the
DUNE Collaboration is considering, among other technologies, a pressurized
argon gas time projection chamber. Such a detector, thanks to its low density
and low detection thresholds, would allow the detailed measurement in argon of
nuclear effects at the neutrino interaction vertex, which are considered at
present one of the most important sources of systematic uncertainty for
neutrino oscillation measurements.
