Jefferson Lab Weekly Briefs June 23, 2010
Jefferson Lab Weekly Briefs
June 23, 2010
12 GeV Upgrade
Civil construction continues to make progress. On the North and South Access building additions, the transformers have been placed on the concrete pads, and the structural steel is set. Metal siding is being installed at the South Access building addition. At the South Linac service building, the contractor has started the ductbank for the power upgrade. On the Hall D Complex, the contactor has completed the Hall D concrete walls. These walls will be another 10 feet higher with structural steel framing. The contractor is also installing the under-slab grounding grid and plumbing at the Tagger Area.
The accelerator was running, with some interruptions. On Wednesday, ion pump 2L17B would not stay on, which caused two beamline valves to close. The faulty control board for the pump was replaced. Right after the ion pump issue was resolved, the underground fiber optics cable for the Personnel Safety System was damaged due to the construction work between the South Access building and the South Linac service building. More than 17 hours were lost due to this event. Some arc box supplies and beamline valve VBV3A03 also caused several hours of downtime. Over the weekend, beam delivery went well. On Monday morning, the accelerator finished the 5.056 GeV run. By Monday evening, the accelerator energy change (5.562 GeV) started.
The FEL group provided terahertz beam for a user, Harvey Rutt, of Southampton University in the U.K. The group is still preparing for ultraviolet lasing in July.
JLab's Safety Numbers
56 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
June 24: Lunchtime lecture and slideshow
Environment, Safety, Health & Quality
Choking occurs when a foreign object, such as food or a toy, becomes lodged in the throat or windpipe, blocking the flow of air. Because choking cuts off oxygen to the brain, administer first aid as quickly as possible. If choking is occurring, the Red Cross recommends a "five-and-five" approach to delivering first aid:
For additional information on assisting someone who is choking, visit The Mayo Clinic website.
Computing and Networking Infrastructure
Redhat Enterprise Linux Version 3 Support Ending
Personal Dosimeter Change-Out Set for June 30
A Grand Lunchtime Lecture and Slideshow