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Data analysis of the DUNE prototype for the future of neutrino physics

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DUNE (Deep Underground Neutrino Experiment) will seek for evidence of CP violation in the leptonic sector, starting 2026. Located in the United-States, this long baseline neutrino oscillation experiment will profit from an intense beam made in FERMILAB and have its far detector in a mine in South Dakota 1300 km away (SURF). The technology chosen for the detector will be liquid argon TPC (LArTPC) and will be made of 4 modules of 10kt each ( 60mx12mx12m fiducial volume). LArTPC allows very precise studies of neutrino interactions, at the mm scale. As this technology has never been operated at such large scale, the DUNE collaboration is currently constructing prototypes at CERN of 6mx6mx6m in the light of writing the Technical Design Report in 2019. There are two options for the LArTPC. One is called the single phase : the fiducial volume and the charge collection occur in liquid. The second is the dual phase : in a thin layer of gaseous argon placed just before the charge collection, an amplification device is introduced. The LAPP is involved in the development of the latest for DUNE through the WA105 collaboration.

The dual phase DUNE prototype (protoDUNE-DP) is being constructed. Since summer 2018, the main elements of the detector have been tested in cold and assembled in the cryostat. By February 2019, the detector will be closed, purged from its impurities and then filled with liquid argon. The first tracks from cosmic rays are expected to be seen in spring 2019.

For protoDUNE-DP, the LAPP neutrino group has a strong implication at the technical and analysis level. One of the main expertise of the group is the understanding of the light signal in the TPC. Indeed, LAr is transparent to its own scintillation light. Given its characteristics, the light signal (read by photomultipliers) can provide an internal trigger for non-beam rare events (like a nearby supernovae explosion), give a timing information for cosmic rays and improve the calorimetry measured by the charge collection.

The internship will happen at a key moment of the experiment : from the commissioning to the first data seen by the prototype. Both charge and light data will be a key ingredient for the DUNE TDR. The internship will be focussed on the analysis, and the understanding, of the scintillation light. Comparison, and improvement, with the simulation that we have developed is also foreseen. In particular, the processes governing the production and propagation of the scintillation light are not yet well known, and the protoDUNE data could bring new constraints on these parameters (e.g. absorption and diffusion length).

Supervisor : Laura Zambelli (zambelli@lapp.in2p3.fr)

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