David Nygren invented the concept of Time Projection Chambers (TPCs) in 1978. In General, TPCs consist of field cage which surrounds gas (or sometime liquid) medium. Particles entering the TPC can interact with a nucleus within the gas causing it to recoil. As the nucleus recoils, it ionizes atoms around it creating a tracks of electrons. The field cage, which produces a uniform electric field, causes the the ionized electrons to drift down towards a readout plane. At the readout plane, the signal of the electrons is amplified. The position on the readout plane along with their drift time is used to reconstruct the ionization track in three dimensions. The resolution with which we are able to reconstruct the tracks and the topology of the track allow us to infer the directionality of the incoming particle as well as distinguish nuclear recoils from electron recoils (which is a prominent noise at the energies we are interested in probing).

TPCs are powerful tools that are often utilized in particle and nuclear physics experiments at accelerators. The have also been implemented to detect neutrinos in neutrino physics experiments. By demonstrating that the latest generation of TPCs can work at the lowest energies with active electron and neutron discrimination, we want to implement TPCs in a large-scale dark matter searches.