Global Argon Dark Matter Collaboration

Global Argon Dark Matter Collaboration
Name	Global Argon Dark Matter Collaboration
Formation	2015
Headquarters	LNGS
Membership	International consortium
Leader title	Spokesperson

Global Argon Dark Matter Collaboration The Global Argon Dark Matter Collaboration is an international consortium coordinating liquid argon direct-detection experiments for weakly interacting massive particle searches. The collaboration brings together research groups, engineering teams, and institutions to integrate detector technology, cryogenics, and data analysis across underground laboratories. It aligns experimental programs with theoretical frameworks motivating dark matter searches, engaging with particle physics, astrophysics, and cosmology communities.

Introduction

The Collaboration unites projects operating at facilities such as Laboratori Nazionali del Gran Sasso, SNOLAB, WIPP, SURF (Sanford Underground Research Facility), and Modane Underground Laboratory to deploy large-scale liquid argon detectors. Member institutions include national laboratories like Fermi National Accelerator Laboratory, TRIUMF, Brookhaven National Laboratory, and universities such as University of Oxford, Massachusetts Institute of Technology, University of Chicago, University of Tokyo, and University of Melbourne. Scientific partnerships extend to consortia associated with experiments like DarkSide, DEAP/CLEAN, Argo, and MiniCLEAN while interacting with theory groups linked to CERN, Perimeter Institute, Kavli Institute for Cosmological Physics, and Institut de Physique Théorique.

History and Formation

Origins trace to early 21st-century liquid noble gas initiatives including XENON1T, LUX-ZEPLIN, and DAMA/LIBRA which emphasized background reduction and scaling strategies. Founding meetings involved representatives from Istituto Nazionale di Fisica Nucleare, European Organization for Nuclear Research, US Department of Energy, and national funding agencies such as Science and Technology Facilities Council and Australian Research Council. Key milestones include memorandum agreements negotiated at workshops hosted by Gran Sasso Science Institute and white papers presented at conferences like International Conference on High Energy Physics, Neutrino 2016, and COSPAR Scientific Assembly.

Scientific Goals and Strategy

Primary objectives are sensitivity improvement to spin-independent and spin-dependent nucleon couplings across weak-scale mass ranges, complementing searches by PICO (experiment), SuperCDMS, and ADMX. Strategy emphasizes scale-up of fiducial mass, suppression of radioactive backgrounds via underground argon sources from Kinder Morgan gas fields and isotopic depletion techniques, and discrimination of nuclear recoils using pulse-shape analysis developed in collaboration with Lawrence Berkeley National Laboratory and Imperial College London. The program coordinates with cosmology results from Planck, structure studies from Sloan Digital Sky Survey, and indirect searches by Fermi Gamma-ray Space Telescope and AMS-02.

Detector Technology and Infrastructure

Technological pillars include two-phase time projection chambers pioneered in projects like ICARUS and adapted from MicroBooNE developments, cryogenic engineering influenced by CERN Cryogenic Laboratory, and ultra-low background materials screening performed at facilities such as SNOLAB Low Background Counting Facility and MPIK (Max Planck Institute for Nuclear Physics). Photon detection leverages silicon photomultipliers advanced at Fondazione Bruno Kessler and wavelength-shifting coatings from Lawrence Livermore National Laboratory. Infrastructure coordination involves procurement, transportation, and storage protocols comparable to logistics used by Large Hadron Collider experiments and radioactive assay networks modeled on Global Network of Underground Laboratories.

Major Experiments and Components

Major projects under the Collaboration umbrella include large-scale detectors analogous to DarkSide-20k, prototype demonstrators inspired by Argo (proposed experiment), and complementary veto systems patterned after GERDA and XENONnT muon veto designs. Components encompass cryostats, high-voltage cathodes developed with input from RAL (Rutherford Appleton Laboratory), calibration systems employing radioactive sources used at SNOLAB, and data acquisition architectures using platforms similar to ATLAS TDAQ and CMS Trigger subsystems. Supply chains coordinate with industry partners experienced by ESA payloads and cryogenics vendors serving ITER.

Collaboration Structure and Membership

Governance combines an elected spokesperson, an executive board drawing members from institutions such as CNRS, Max Planck Society, Lawrence Livermore National Laboratory, and national laboratories, and technical boards for cryogenics, radiopurity, and analysis. Membership categories mirror arrangements in LIGO Scientific Collaboration and IceCube Collaboration with full members, associate institutes, and industrial partners. Memoranda define data-sharing policies, publication rules, and intellectual property arrangements analogous to frameworks used by CERN experiments and multinational research projects like Human Genome Project.

Research Results and Impact

Results to date include limits on WIMP-nucleon cross sections competitive with LUX and XENON series, advances in argon purification and underground sourcing influencing experiments such as DEAP-3600, and methodological contributions to pulse-shape discrimination cited by Astroparticle Physics and Physical Review Letters. Impact extends to detector material assay techniques adopted by Majorana Demonstrator and cryogenic handling practices informing neutrino detectors like DUNE. Collaborative data and simulation tools are used by theoretical groups at Perimeter Institute and Kavli Institute for Cosmology for model constraints.

Outreach, Funding, and Future Plans

Outreach efforts coordinate with science centers including Science Museum, London, Smithsonian Institution, and university public programs at MIT Museum. Funding sources comprise national agencies such as National Science Foundation, European Research Council, National Natural Science Foundation of China, and philanthropic foundations akin to Simons Foundation. Future plans emphasize scaling to multi-tonne fiducial masses, prototype deployments at SNOLAB and SURF, and cross-discipline synergies with DUNE and Hyper-Kamiokande for neutrino backgrounds, with roadmap discussions held at meetings like Neutrino 2024 and ICHEP.

Category:Physics collaborations