Jefferson Lab Weekly Briefs February 8, 2012
Jefferson Lab Weekly Briefs
February 8, 2012
12 GeV Upgrade
The 12 GeV installation activities for the long shutdown scheduled to begin in May are under development. A weekly Long-Shutdown Planning meeting is being held to integrate the lab-wide installation schedule. With Beneficial Occupancy awarded for the Hall D Complex, ongoing installation work is being coordinated through the Hall D work coordinator.
The Hall A g2p/gep installation continued. The target work is proceeding rather smoothly. The experiment did find that the field in the septum magnets was much smaller then expected; fortunately, this problem could be mitigated by adding iron to reduce the gap size, and the work is already in the machine shop. This, in addition other items that are coming in at the last second, will likely delay the start of the experiment by several days. In other items, the Hall A Moller magnet remapping has been completed, and the power supplies needed for the upcoming run are all up and running.
Hall C continues to take Q-weak production data on the LH2 target with 180 microamp beams, punctuated by occasional runs on an aluminum target to measure the background contribution from the LH2 target walls. Q-weak will hold a collaboration meeting Feb. 12-14 at JLab.
School on Radiation Technologies Application Deadline Extended
The week began with smoothly running beam to Halls B and C with only small issues interrupting beam delivery. On Wednesday, beam delivery was interrupted for approximately 12 hours to characterize the radiation levels surrounding the new C100 zones. Opportunistically, Accelerator Operations staff used this time to work on hardware issues in other areas of the machine. Late Saturday night, a radiofrequency cavity in the injector developed a problem staying in tune. Replacing the tuner control hardware card grew into a control system communication problem, resulting in almost four hours of lost beam time. On Sunday during the Super Bowl, a handful of power supplies for the major dipoles all tripped off at the same time. Restoring power, cycling these large magnets through hysteresis and checking orbits resulted in an hour of lost beam time. Overall, other than the tuner card issue and the power supplies tripping off over the weekend, the machine ran nicely all week.
The FEL is starting operations after a four month shutdown. During the shutdown, the gun electrodes were re-furbished and a semi-loadlock system was added to enable cathode replacement without venting the entire gun. This week. FEL staffers completed high-voltage conditioning, prepared for the installation of a new cathode and energized and tested power supplies.
JLab Calendar of Events
Feb. 15: Colloquium and Public Lecture
Environment, Safety, Health and Quality
Driver Safety in Parking Lots
New Experimental Hall Posters Now Available
There and Back Again: Adventures in Tanzania
Golf League Forming for Season
New Bike Club Jersey in the Works
Calling All Design Fashionistas!
Come Out and Play on the JLab Softball Team!
JLab's 2012 Benefits Open Enrollment Begins Feb. 14
Take Time to Tango - Part Two
Onsite TIAA-CREF Counseling Offered
Tracking Thomas at JLab
Congratulations this week go to Samika Hawkins and Casey Heck, who were the first to correctly identify the Feb. 1 location. Honorable mentions go to Dan Moore, David Lawrence, Stephanie Vermeire, Josh Foyles and David Anderson. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.