Muon Accelerator Program

Muon Accelerator Program
Name	Muon Accelerator Program
Abbreviation	MAP
Established	2010
Headquarters	Fermilab
Field	Accelerator physics

Muon Accelerator Program

The Muon Accelerator Program was a U.S.-led initiative to develop concepts and technologies for producing, cooling, accelerating, and colliding intense beams of muons for high-energy physics and neutrino facilities. It coordinated research at national laboratories and universities to advance accelerator concepts related to muon-based neutrino sources and muon colliders, interfacing with international projects and particle physics experiments.

Overview

The program brought together researchers from Fermilab, Brookhaven National Laboratory, Lawrence Berkeley National Laboratory, Sandia National Laboratories, Los Alamos National Laboratory, Oxford University, Imperial College London, CERN, SLAC National Accelerator Laboratory, University of Chicago, Massachusetts Institute of Technology, Stanford University, California Institute of Technology, University of Oxford, University of Cambridge, University of Manchester, University of California, Berkeley, Princeton University, Columbia University, University of Michigan, University of Illinois Urbana-Champaign, Cornell University, Rutgers University, University of Washington, University of Wisconsin–Madison, Harvard University, Yale University, University of California, Los Angeles, Indiana University Bloomington, Texas A&M University, University of Texas at Austin, University of California, Santa Barbara, University of California, Riverside, University of Colorado Boulder, University of Pittsburgh, University of Notre Dame, Ohio State University, Purdue University, Michigan State University, Northwestern University, University of Minnesota, Johns Hopkins University, Duke University, University of Florida, University of Arizona, Arizona State University, Rice University, Washington University in St. Louis, Baylor University, University of Massachusetts Amherst, University of Hawaii at Manoa, University of California, San Diego, Virginia Tech, Colorado School of Mines, Lehigh University to coordinate muon accelerator R&D and interface with experimental programs and funding agencies such as the United States Department of Energy and European Organization for Nuclear Research. The effort emphasized synergies with projects like the Neutrino Factory, the International Linear Collider, the Compact Linear Collider, and conceptual studies for future colliders.

Scientific Motivation and Physics Goals

The program targeted physics motivated by experiments at Large Hadron Collider, precision measurements at B-factory experiments like Belle II and BaBar, and neutrino oscillation studies from detectors such as Super-Kamiokande, DUNE, and NOvA. Muon-based facilities promised high-intensity neutrino beams relevant to T2K and Hyper-Kamiokande oscillation parameters, precision Higgs studies comparable to proposals for Future Circular Collider, International Linear Collider physics cases, and potential discovery reach complementary to High-Luminosity Large Hadron Collider and proposed hadron colliders like the Future Circular Collider (hadron) and concepts discussed at Snowmass (particle physics) 2013. Targets included demonstration of s-channel Higgs production, charged lepton flavor violation searches in experiments related to MEG and Mu2e, and precision electroweak measurements alongside searches pursued at ATLAS and CMS.

Accelerator Design and Technology

Design studies integrated concepts from superconducting radio-frequency technology used at European XFEL, RF cavity designs from SLAC National Accelerator Laboratory programs, and high-field magnet development akin to projects at CERN and Brookhaven National Laboratory. Core technologies included rapid muon production via proton drivers like those tested at ISIS neutron source and J-PARC, capture systems with solenoids similar to designs at SNS (Spallation Neutron Source), ionization cooling channels inspired by muon cooling concepts from MICE and RF cavities studied at Fermilab MuCool, and acceleration schemes using recirculating linear accelerators and fixed-field alternating gradient rings comparable to techniques at Jefferson Lab and TRIUMF. Beam dynamics drew on expertise from simulation efforts at KEK, DESY, Paul Scherrer Institute, Rutherford Appleton Laboratory, Helmholtz-Zentrum Berlin, GSI Helmholtz Centre for Heavy Ion Research, Max Planck Institute for Physics, Institut Laue–Langevin, Institute for High Energy Physics (IHEP) Beijing, Budker Institute of Nuclear Physics, and Kurchatov Institute.

R&D and Key Demonstrations

Key demonstrations were coordinated with experiments and testbeds including the Muon Ionization Cooling Experiment (MICE), RF tests at Fermilab, high-power target studies with heritage from MERIT experiment, and material and radiation studies leveraging facilities at Los Alamos National Laboratory and Sandia National Laboratories. The program supported simulation and design tools like those developed at CERN and SLAC, and engaged detector groups connected to DUNE and ICARUS. Collaborations with accelerator schools and workshops such as USPAS, CERN Accelerator School, IPAC, and Snowmass (particle physics) 2013 helped disseminate results and train personnel.

Project Organization and Collaboration

MAP was structured as a collaboration among U.S. national laboratories, universities, and international partners including CERN, KEK, J-PARC, TRIUMF, STFC Rutherford Appleton Laboratory, European Spallation Source, ITER Organization partners in technology exchange, and regional funding bodies like Science and Technology Facilities Council and National Science Foundation. Management and oversight involved interactions with advisory committees similar to those at DOE Office of Science and planning processes exemplified by P5 (Particle Physics Project Prioritization Panel), with community input from meetings such as Snowmass (particle physics) 2013 and HEPAP.

Facilities and Proposed Sites

Technical work and experiments were sited at places including Fermilab, BNL (Brookhaven National Laboratory), LBNL (Lawrence Berkeley National Laboratory), SLAC National Accelerator Laboratory, Rutherford Appleton Laboratory, TRIUMF, J-PARC, CERN, and test facilities at Oak Ridge National Laboratory and Pacific Northwest National Laboratory. Proposed collider and neutrino facility sites considered layouts on the Fermilab site, studies referencing infrastructure models from CERN, and regional planning documents similar to those produced for DUNE and Future Circular Collider studies.

Challenges and Future Prospects

Technical challenges included demonstration of efficient ionization cooling as in MICE, high-gradient RF operation in magnetic fields tested at Fermilab MuCool, target survivability building on MERIT results, and high-field superconducting magnets inspired by work at BNL, CERN, and LBNL. Programmatic challenges mirrored issues addressed by P5 (Particle Physics Project Prioritization Panel) reviews and international coordination exemplified by ICFA deliberations. Future prospects depend on synergies with next-generation collider proposals like Future Circular Collider, International Linear Collider, and neutrino programs such as DUNE and Hyper-Kamiokande, and on technological progress in superconducting RF, magnet development at CERN and BNL, and targetry at J-PARC and SNS (Spallation Neutron Source).

Category:Particle accelerators