Upgrades to the CMS detector

Patricia McBride

Patricia McBride, head of the CMS Center, wrote this column.

The CMS detector will complete its nine-month run at a collision energy of 8 TeV soon, and the members of the CMS collaboration are already preparing for future runs at higher energies. Starting in the spring, there will be a long shutdown of the LHC for upgrades to its accelerator components. At the same time, we will make some improvements to the CMS detector. In late 2014, the LHC will start up again with energies close to 14 TeV.

We anticipate the LHC peak luminosity could reach ~2 x 1034 cm-2s-1, which would more than double the rate of proton-proton collisions that the LHC produces now. The CMS collaboration has planned upgrades to the CMS detector to match the anticipated flood of collisions. The upgrades include a new pixel detector, new photo detectors, improved data readout for the full barrel and endcap hadron calorimeters and an upgrade to the level-1 trigger system. Jeff Spalding from Fermilab is the co-coordinator for the CMS upgrade program at CERN.

The CMS collaboration recently released Technical Design Reports for the new pixel detector and the upgrades for the hadron calorimeters. These documents received favorable reviews from the LHC Committee at CERN at its meeting in September.

The U.S. Department of Energy gave first stage approval (CD-0) in September for the plans for U.S. participation in the upgrade program for the CMS and ATLAS detectors. The next step in the DOE approval process will come in spring 2013 and will require the CMS and ATLAS collaborations to provide details about the budget and schedule for the U.S. contributions to the upgrade project. The collaborations will submit to the National Science Foundation a proposal for the upgrade project at the end of this calendar year.

The US CMS collaboration proposes to take on a significant role in the CMS upgrade project. Fermilab scientists and engineers are working with university teams from around the world to develop the plans. We look forward to the challenge of constructing and commissioning the upgrades for the CMS detector. Installation must be completed by the end of the second long shutdown of the LHC, which is currently scheduled for 2018, following several years of running at 14 TeV. In addition to the work on the detector, Fermilab and US CMS will continue their leading roles in preparing the CMS software framework and computing infrastructure for the future demands of LHC data collection and processing.