United States of America
Number of CERN users
1708 (January 2012)
CERN contact
R. Voss
Participation in CERN Experiments
ALICE, ATLAS, CMS, LHCb, LHCf, ACE, ALPHA, ATRAP, CAST, CLOUD, ICARUS, ISOLDE, MERIT,
NA62, nTOF, RD39, RD42, RD50
Participation in CERN Accelerator Projects
LHC, CLIC/CTF3, LINAC4, New inner triplet for sLHC Phase I (NIT),
sLHC Phase II studies
WLCG Participation
2 Tier-1 centres, 12 Tier-2 centres
Collaborating Institutes
° State University Albany
° Argonne National Laboratory
° University of Arizona
° University Texas Arlington
° Auburn University
° Johns University California Berkeley
° Lawrence Berkeley National Lab. (LBNL) Berkeley
° University Boston
° Brandeis University
° Brookhaven National Lab. (BNL) Upton
° Brown University
° SUNY Buffalo
° California Poly.
° California Institute of Technology
° Carnegie Mellon University
° Case Western University, Cleveland
° University Chicago
° University of Colorado
° Columbia University
° Cornell University
° Creighton University
° Southern Methodist University, Dallas
° University Texas Dallas
° UC Davis
° Duke University, Durham
° George Mason University, Fairfax
° Fairfield University
° Fermi National Accelerator Laboratory
° University of Florida
° Florida Institute of Technology
° Florida Int. University
° Florida State University
° Hampton University
° Harvard University
° Houston
° University of Illinois
° Indiana University, Bloomington
° Iowa State University, Ames
° University California, Irvine
° Jefferson NL
° University of Kansas
° Kansas State University
° UC Los Angeles
° Livermore NL
° Maryland University
° Massachusetts University, Amherst
° Massachusetts Institute of Technology (MIT), Cambridge
° University Michigan, Ann Arbor
° Michigan State University
° University of Minnesota
° University of Mississipi
° University of Missouri-Rolla
° New Mexico University, Albuquerque
° New York University
° Northeastern University
° Northwestern University
° University of Notre Dame
° Oak Ridge National Laboratory
° Ohio State University, Columbus
° University of Oklahoma
° Oklahoma State University
° University Oregon, Eugene
° University Pennsylvania
° Penn State University
° University Pittsburgh
° Princeton University
° Puerto Rico University
° Purdue University
° Rice University
° UC Riverside
° University of Rochester
° Rockefeller
° Ritgers
° UC San Diego
° UC Santa Barbara
° UC Santa Cruz
° State Universtiy New York, Stony Brook
° Syracuse
° University Washington, Seattle
° SLAC, Stanford
° University Tennessee
° Texas A&M University
° Texas Tech. University
° Texas University, Dallas
° Tufts University, Medford
° University Illinois Urbana
° Vanderbilt University
° University of Virginia
° Wayne State University
° University of Wisconsin, Madison
° Yale University, New Haven
US physicists have been participating in a wide range of experiments at CERN for over 30 years,
from the ISR through SPS fixed-target experiments, all the LEP experiments (L3, ALEPH, OPAL, DELPHI),
heavy-ion experiments (NA45, NA49) and ISOLDE. Following the demise of the Superconducting Super Collider (SSC)
in 1993, many US physicists joined ATLAS and CMS, and some have also joined ALICE and LHCb.
The US has made contributions to the LHC accelerator construction, coordinated by Fermi National Accelerator
Laboratory (FNAL) and Brookhaven National Laboratory (BNL), under an Implementation Protocol that expired in 2007.
The US also set up the LHC Accelerator Research Program (LARP) to support LHC commissioning, including both beam
monitors and human resources, and R&D on magnets for a possible LHC upgrade. The USA is a special Observer State,
with the right to attend restricted Council sessions for discussions of LHC matters.
The US contributions to ATLAS and CMS have been substantial. They were funded jointly by the Department of
Engergy (DOE) and the National Science Foundation (NSF) under an Implementation Protocol agreed in 1996 and finalized
in 1997, which runs until 2017. The US user community has expanded, as attention has shifted away from their domestic
programme with the completions of the CLEO, BABAR and soon the Tevatron experiments, and new groups have joined ATLAS
and particularly CMS.
The US also contributed manpower at CERN to the development of the WLCG, and is contributing two Tier-1 centres
to its operations.
Groups from the SLAC National Accelerator Laboratory and Northwestern University already participate in the CLIC
R&D programme, and the DOE has undertaken to strengthen this activity. There is also a US participation in LINAC4.