University of Wisconsin-Madison Physical Sciences Lab

CMS Upgrades for More Power

Thursday, February 28th, 2013

Picture of the CMS YE+3 DiskThe YE3 disk.

The Large Hadron Collider (LHC), after finding the Higgs boson, will be shut down for two years to allow for maintenance and upgrades. Part of those upgrades includes adding the final 72 ME4/2 muon chambers to the YE3 end cap of the Compact Muon Solenoid (CMS).

LHC had been running at 7 Trillion electron Volts (TeV), but with the upgrades it will be running at 15TeV. At the 7 TeV level, the 4th set of chambers were not required. However, at the higher 15 TeV level, they are necessary to better track the collisions and to help determine which collisions are worth studying.

Picture of the copper tubesThe copper tubes bent and ready to be shipped to CERN.

The chambers use a mixture of argon, carbon dioxide, and carbon tetrafluoride gases to detect particles emitted from the collision. PSL Technician Ron Smith bent copper tubing which provides the gas to the chambers. Pre-bending the tubes at PSL will allow for faster installation and testing of the chambers and electronics.