DUNE (project)

DUNE (project)
Name	DUNE (project)
Established	2015
Location	Fermilab, Lead, South Dakota
Type	Particle physics experiment
Budget	~\$3 billion

DUNE (project)

The Deep Underground Neutrino Experiment is a multinational particle physics experiment designed to study neutrino properties using a long-baseline accelerator neutrino beam from Fermilab to a far detector complex at the Sanford Underground Research Facility near Lead, South Dakota. The project unites institutions across United States, Europe, Asia, South America, and Africa to pursue measurements related to CP violation, neutrino mass ordering, and proton decay, and to search for neutrinos from core-collapse supernovae. DUNE integrates advances in liquid argon time projection chamber technology, large-scale underground construction, and high-intensity beam operations under the auspices of international governance.

Overview

DUNE is a flagship initiative in 21st-century particle physics that couples an intense neutrino beam produced at Fermilab with massive cryogenic detectors located 1,300 kilometres away at the Sanford Underground Research Facility (SURF). The experiment builds upon legacy programs including MINOS, NOvA, T2K, ICARUS, and Super-Kamiokande while incorporating techniques developed by MicroBooNE, ProtoDUNE, and ArgoNeuT. DUNE's scope involves accelerator upgrades at Fermilab Accelerator Complex, cryostat engineering influenced by CERN-hosted prototype tests, and international funding collaborations with agencies such as the U.S. Department of Energy, European Commission, National Science Foundation, and national laboratories including Brookhaven National Laboratory and Lawrence Berkeley National Laboratory.

Science Goals

DUNE targets several core scientific objectives central to contemporary particle physics and astroparticle physics. Primary aims include determining the neutrino mass ordering and measuring the Dirac CP violation phase in the three-flavor neutrino mixing matrix, complementing results from J-PARC experiments and reactor programs like Daya Bay and RENO. DUNE will search for baryon-number-violating processes such as proton decay modes predicted by grand unified theories discussed in the context of SU(5) and SO(10). The experiment will provide sensitivity to neutrino bursts from core-collapse supernovae, informing models of stellar evolution, nucleosynthesis, and neutrino flavor transformation in dense media (collective oscillations). Additional goals include precision neutrino cross-section measurements relevant to long-baseline analyses and searches for physics beyond the Standard Model such as sterile neutrinos, nonstandard interactions, and light dark sector particles connected to proposals from SHiP and Beam Dump experiments.

Detector Design and Technology

The far detector system comprises four modules of liquid argon time projection chambers (LArTPCs) instrumented to record ionization and scintillation from neutrino interactions. Designs under consideration include single-phase and dual-phase LArTPC technologies with readout concepts tested by ProtoDUNE-SP and ProtoDUNE-DP at CERN Neutrino Platform. Cryostat construction draws on industrial scale techniques evaluated in LNG storage and previous underground projects at Gran Sasso National Laboratory and SURF. Photon detection systems leverage developments from MicroBooNE and SBND, while cold electronics design incorporates lessons from ICARUS and bespoke ASICs developed in collaboration with national laboratories. Near detector concepts at Fermilab involve a combination of high-resolution LArTPCs, magnetized spectrometers, and emulsion detectors informed by experience from MINERvA and NOMAD to constrain beam flux and neutrino interaction systematics.

Site and Infrastructure

The beamline originates in the Fermilab Accelerator Complex, using upgrades to the Main Injector to provide multi-MW proton power. The long-baseline tunnel connects to the SURF site where detectors are housed approximately 1,480 metres underground in the former Homestake Mine, alongside existing underground research infrastructure supporting experiments such as LUX-ZEPLIN and MAJORANA DEMONSTRATOR. SURF provides access, hoisting, and utilities coordinated with state and federal partners in South Dakota and stakeholders including the Sanford Underground Research Facility management and the South Dakota Science and Technology Authority.

Collaboration and Governance

DUNE is governed by an international collaboration comprising universities, national laboratories, and funding agencies coordinated through a collaboration board, executive committee, and technical boards. Major institutional contributors include Fermilab, CERN, Brookhaven National Laboratory, Argonne National Laboratory, TRIUMF, and the European Organization for Nuclear Research. Funding and oversight involve agencies such as the U.S. Department of Energy Office of Science, national research councils across Europe and Asia, and bilateral agreements guided by memoranda of understanding negotiated among partner institutions.

Construction and Timeline

Construction encompasses beamline upgrades at Fermilab, near detector complex fabrication, and staged deployment of far detector modules at SURF. Prototype validation occurred with ProtoDUNE installations at CERN in the late 2010s, informing cryostat, cryogenics, and detector assembly procedures. The project follows a phased schedule with initial module commissioning targeted for the mid-2020s to early 2030s, subject to funding profiles and international commitments; subsequent modules and accelerator power upgrades aim to reach full sensitivity in the 2030s. Major milestones include final design reviews, cryostat installation, and progressive data-taking runs coordinated with global neutrino programs.

Results and Impact

While full-scale physics results await complete detector operation, ProtoDUNE and near-term prototypes have validated LArTPC performance, high-voltage stability, and cryogenic purification methods, influencing detector engineering across particle physics experiments. DUNE's anticipated measurements will shape understanding of leptonic CP violation with implications for theories addressing the matter–antimatter asymmetry and inform model-building in grand unified and beyond-Standard-Model frameworks. The project fosters international workforce development, technology transfer in cryogenics and detector electronics, and synergies with underground science initiatives at SURF and other laboratories.

Category:Particle physics experiments Category:Neutrino experiments Category:International scientific collaborations