MICE Collaboration

MICE Collaboration
Name	MICE Collaboration
Type	International research collaboration
Headquarters	Rutherford Appleton Laboratory
Formed	2001
Region served	International
Leader title	Spokesperson

MICE Collaboration

The MICE Collaboration conducted an international experimental program to demonstrate muon beam ionization cooling and advance accelerator technology for future facilities such as the Large Hadron Collider, Fermilab, CERN, RIKEN, and the proposed Neutrino Factory. Comprising institutions from Europe, North America, and Asia, the collaboration integrated expertise from laboratories and universities including Rutherford Appleton Laboratory, Imperial College London, University of Oxford, University of Tokyo, and University of Chicago. The project interfaced with concepts from the Muon g−2 experiment, International Linear Collider, Compact Linear Collider, and studies related to the Deep Underground Neutrino Experiment.

Overview

MICE was established to address key technical challenges for muon-based facilities discussed at forums such as the European Strategy for Particle Physics and reports by the Particle Physics Project Prioritization Panel. The collaboration drew on accelerator concepts from Stanford Linear Accelerator Center, theoretical inputs from CERN Theory Department, and detector experience from collaborations like ATLAS, CMS, LHCb, and Super-Kamiokande. MICE engaged with accelerator laboratories including Brookhaven National Laboratory, Thomas Jefferson National Accelerator Facility, SLAC National Accelerator Laboratory, and national agencies such as the Science and Technology Facilities Council, US Department of Energy, National Science Foundation, and Japanese Ministry of Education, Culture, Sports, Science and Technology.

Scientific Goals and Research Program

MICE aimed to demonstrate ionization cooling of muon beams, a technique proposed in studies by groups at Los Alamos National Laboratory, INFN, and DESY. Objectives included measuring transverse emittance reduction, validating cooling channel designs inspired by proposals for the Neutrino Factory and the Muon Collider, and providing systematic comparisons to simulations developed with tools such as GEANT4, MAD-X, and G4Beamline. The program connected to physics goals pursued at facilities like SuperKEKB, Belle II, and neutrino experiments such as T2K, NOvA, and Hyper-Kamiokande by enabling high-intensity muon sources for precision measurements like those in the Muon g−2 experiment and searches for charged-lepton-flavor violation exemplified by Mu2e and COMET.

Experimental Setup and Instrumentation

The experiment was hosted in a beamline at Rutherford Appleton Laboratory drawing on magnet and cryogenic expertise from STFC, Oxford Instruments, and groups at University College London. Key hardware included superconducting solenoids designed with collaboration from NIKHEF, CEA Saclay, and FNAL, absorbers using liquid hydrogen technologies from Brookhaven National Laboratory and safety input from Health and Safety Executive, and RF cavity systems developed with partners at Lawrence Berkeley National Laboratory and Daresbury Laboratory. Instrumentation incorporated trackers based on scintillating-fiber technology used previously by D0, time-of-flight systems with photomultipliers similar to those in MINOS, Cherenkov detectors analogous to designs at NA62 and KLOE, and calorimetry techniques comparable to CALICE and OPERA. Control, data acquisition, and analysis pipelines interfaced with software frameworks such as ROOT, Gaudi, Python (programming language), and computing resources at GridPP and the Open Science Grid.

Key Results and Publications

MICE published precision measurements of single-particle emittance and demonstrated cooling channel performance benchmarks referenced in journals where work of Physical Review Letters, Physical Review Accelerators and Beams, Journal of Instrumentation, Nature Physics, and Nuclear Instruments and Methods in Physics Research Section A appear. Results provided validation points for simulation codes used at CERN Neutrino Platform, European Spallation Source, and design studies for the Muon Collider Collaboration and informed technology choices for experiments including PRISM and upgrades at J-PARC. Peer-reviewed outputs involved contributors affiliated with University of Manchester, University of Glasgow, University of Sheffield, Columbia University, Massachusetts Institute of Technology, Harvard University, University of Michigan, Yale University, University of California, Berkeley, University of California, Los Angeles, University of Wisconsin–Madison, University of Illinois Urbana-Champaign, Rutgers University, University of Toronto, and McGill University.

Collaboration Structure and Participating Institutions

Governance comprised spokespersons, an international executive board, technical boards, and working groups with institutional representatives from national laboratories and universities such as Rutherford Appleton Laboratory, STFC, Institut Laue-Langevin, CEA, INFN, DESY, NIKHEF, TRIUMF, SNOLAB, University of Oxford, Imperial College London, University College London, University of Manchester, University of Glasgow, Lancaster University, University of Cambridge, Queen Mary University of London, University of Birmingham, Leeds University, University of Edinburgh, University of Sheffield, University of Bristol, University of Liverpool, University of York, University of Sussex, University of Southampton, Durham University, King's College London, University of St Andrews, Arizona State University, Boston University, Cornell University, Duke University, Fermi National Accelerator Laboratory, Lawrence Berkeley National Laboratory, Brookhaven National Laboratory, Los Alamos National Laboratory, Princeton University, Stanford University, Caltech, University of Tokyo, Tohoku University, Osaka University, KEK, National Central University (Taiwan), Academia Sinica, Seoul National University, Korea Advanced Institute of Science and Technology, and Australian National University.

Funding, Timeline, and Project Status

Funding was provided through national agencies including the Science and Technology Facilities Council, US Department of Energy, National Science Foundation, European Research Council, Japan Society for the Promotion of Science, and contributions from institutional partners such as STFC and INFN. The project timeline included proposal and R&D phases in the 2000s, construction and beam tests in the 2010s, and publication of key results in the late 2010s and early 2020s; milestones were reported in forums such as the International Conference on High Energy Physics and International Particle Accelerator Conference. Following demonstration campaigns and technology transfers to related projects like the Neutrino Factory studies and Muon Collider design efforts, the collaboration completed its primary experimental goals while continued analysis and archival activities involve participating institutions and archival repositories including CERN Document Server.

Category:Particle physics collaborations