DUNE (experiment)

DUNE (experiment)
Name	DUNE
Caption	Schematic of the far detector and beamline
Established	2015
Location	Fermilab, near Lead, South Dakota
Field	Particle physics
Participants	CERN, Fermilab, Brookhaven National Laboratory, SLAC National Accelerator Laboratory, California Institute of Technology, Massachusetts Institute of Technology

DUNE (experiment) The Deep Underground Neutrino Experiment is an international particle physics project to study neutrino properties using a long-baseline beam from Fermilab to a deep underground facility near Lead, South Dakota. It unites institutions including CERN, Brookhaven National Laboratory, SLAC National Accelerator Laboratory, Massachusetts Institute of Technology, and California Institute of Technology to build large-scale liquid argon detectors and precision near-site instrumentation. DUNE aims to address major open questions in particle physics, astrophysics, and cosmology while operating within the U.S. Department of Energy science program and global partnerships.

Overview

DUNE is conceived as a next-generation neutrino oscillation experiment employing a long-baseline from Fermilab to the Sanford Underground Research Facility near Lead, South Dakota; it builds on experience from projects such as Super-Kamiokande, SNO (Sudbury Neutrino Observatory), NOvA, T2K, and MINOS. The program integrates large-volume liquid argon time projection chamber technology pioneered by collaborations including ICARUS and MicroBooNE and benefits from accelerator developments at Fermilab and synergies with facilities at CERN and Brookhaven National Laboratory. DUNE is organized to deliver both a far detector in a deep underground site and a near detector complex at the beam source, enabling precision studies of neutrino oscillation parameters and searches for rare processes such as proton decay and core-collapse supernova neutrino bursts.

Scientific goals

Primary goals include determination of the neutrino mass ordering and measurement of the CP violation phase in the lepton sector to test mechanisms tied to baryogenesis and the matter–antimatter asymmetry. DUNE seeks sensitivity to precision measurements of θ13, θ23, and Δm² parameters to test three-flavor neutrino oscillation paradigms first explored by experiments like KamLAND, Daya Bay, and RENO. It aims to search for baryon-number-violating decays predicted in grand unified theory frameworks such as SU(5) and SO(10), improving limits on proton decay modes explored by Super-Kamiokande. DUNE will observe neutrino signals from galactic core-collapse supernovae, contributing to astrophysics and nuclear physics constraints, and probe exotic phenomena including sterile neutrino scenarios and nonstandard interactions considered in analyses with data from IceCube and ANTARES.

Detector design

The far detector will consist of multiple 10-kilotonne-scale modules of liquid argon time projection chambers (LArTPCs), with designs developed by collaborations informed by ICARUS, ProtoDUNE prototypes at CERN, and MicroBooNE. Modules implement single-phase and dual-phase readout concepts enabling millimeter-scale imaging of charged-particle tracks and calorimetry comparable to bubble chamber-era visual detail modernized by high-voltage time projection chamber methods. The near detector complex integrates magnetized spectrometers, fine-grained trackers, and liquid argon elements to measure the unoscillated beam flux and cross sections, leveraging detector technologies demonstrated at MINERvA, ND280, and MINOS.

Beam and facilities

The neutrino beam is produced by the Fermilab accelerator complex, including upgrades to the Main Injector and PIP-II superconducting linear accelerator to increase beam power toward multi-megawatt-class operation; this beamline follows a long baseline of 1,300 kilometers to the far site at the Sanford Underground Research Facility. Beamline components include targets, horns, decay pipes, and absorber systems developed in collaboration with CERN engineering teams and informed by operations at facilities like NuMI and experiments such as NOvA. Surface and underground civil works encompass caverns, cryostats, and cryogenic systems for liquid argon handling, drawing on expertise from Brookhaven National Laboratory, SLAC National Accelerator Laboratory, and industrial partners.

Timeline and construction

DUNE emerged from international planning under the Long-Baseline Neutrino Facility and received formal project approval phases in the 2010s, with detector prototyping through ProtoDUNE tests at CERN in the late 2010s and early 2020s. Construction milestones include excavation at the Sanford Underground Research Facility, cryostat fabrication, and progressive module installation; schedule objectives aim for first module commissioning in the mid-2020s with staged physics running thereafter. Project timelines are coordinated with funding and reviews by the U.S. Department of Energy Office of Science and partner agencies such as CERN and national laboratories including Fermilab and Brookhaven National Laboratory.

Collaboration and organization

The DUNE collaboration comprises thousands of scientists, engineers, and technicians drawn from universities and laboratories worldwide, organized into working groups on oscillations, detector development, calibration, computing, and physics analysis; institutional members include Fermilab, CERN, Brookhaven National Laboratory, SLAC National Accelerator Laboratory, Massachusetts Institute of Technology, and California Institute of Technology. Governance structures involve an executive board, institutional board, and scientific coordination linked to facility management at Fermilab and the Sanford Underground Research Facility, with international contributions formalized through memoranda with agencies such as the U.S. Department of Energy and CERN.

Results and impact

While full-scale physics results await operation of the complete far detector, prototype campaigns like ProtoDUNE produced critical validation of LArTPC performance, informing design choices and analysis methods used in experiments such as MicroBooNE and ICARUS. DUNE-driven advances in cryogenics, large-scale detector engineering, and accelerator upgrades will influence future projects in particle physics and astrophysics, and its measurements of neutrino properties could have profound implications for theoretical programs in grand unified theory research and cosmological models addressing the matter–antimatter asymmetry. The collaboration’s data and technological legacy are expected to shape next-generation facilities and international research priorities.

Category:Neutrino experiments