University of Wisconsin-Madison Physical Sciences Lab

Archive for October, 2013

CMS Upgrades and Repairs for More Energy

Tuesday, October 29th, 2013

Since the discovery of the Higgs boson last year, the Large Hadron Collider (LHC) has shut down for upgrades. These upgrades, during what CERN calls Long Shutdown 1 (LS1), will more than double the energy of the LHC from 7 trillion electron volts (TeV) to 15 TeV.

During LS1, the LHC is also doing repairs. Recently PSL engineer Dan Wenman went to CERN to do some repairs on the Compact Muon Solenoid (CMS). One of the repairs performed was to fix some cathode strip chambers (CSC), which detect the position of passing muon particles.

The CSCs were removed using a PSL-designed apparatus, nicknamed the “Bart-o-Matic”, which is designed specifically to hold the chambers during installation and removal.

Copper…in flux

Friday, October 18th, 2013

PSL recently replaced and resoldered copper tubing on two diffusion pumps for UW Medical Physics. PSL originally soldered the copper tubing on the pumps seven years ago, and over time the copper tubing corroded to the point that the tubing had to be replaced.




A pump with the new copper tubing.

How the Higgs Boson was found

Friday, October 4th, 2013

Photo of CMS disk being lowered into CMS cavern

PSL will host UW-Madison Physics Professor Wesley Smith for a talk on finding the Higgs Boson. The talk will be held at PSL on Oct. 10th, at 11:00 am in the PSL large conference room. Appetizers and beverages will be provided.

PSL was instrumental in the design of the Compact Muon Solenoid of the Large Hadron Collider. The discovery of the Higgs Boson was Science Magazine’s “Breakthrough of the Year” for 2012.

See the poster.