Jefferson Lab Weekly Briefs February 27, 2013
Jefferson Lab Weekly Briefs
February 27, 2013
12 GeV Upgrade
Assembly of the tenth (of 10) C100 cryomodule continues. Acceptance testing of the sixth C100 was completed in the Test Lab, and it has been moved to the tunnel. Work on the new radiofrequency zones continues. Connections of the power supplies to the quadrupole and corrector dipole magnets is ongoing in the east arc beamlines, west recombiner and east spreader regions. Installation of girders and dipole magnets for the west recombiner continues, along with stands for the transport channel recombiner. Magnet cable pulls are complete in the east arcs and nearly complete in the west arcs. Preparation continues for the commissioning of the 4.5 Kelvin coldbox for the Central Helium Liquefier-2 (CHL2) next month. All five of the new warm compressors for CHL2 have been operated successfully. The Hall D refrigerator has been cooled to 4 K. Assembly continues of the cryogenics transfer line that will connect CHL2 to the linacs. Installation of the pedestals for the beamline to Hall D has started. Removal of the beamlines to Halls A, B and C is underway. A final functional review of the new beam position monitor (BPM) electronics was held.
In Hall C, the demolition of the Short Orbit Spectrometer shield house in Hall C was completed. In addition, the SOS frame was disconnected from the target pivot and the wheels were removed. The remaining 100-ton base frame was removed from the hall this week, readying Hall C for construction of the Super High Momentum Spectrometer support structure. Installation of the rail for the SHMS has been completed.
Save the Date for the 2013 Users Group Annual Meeting
Reserve Your Space in the ARC Library
Free Electron Laser
Most staffers have been transferred to non-FEL jobs until funding from the Office of Naval Research resumes. A small amount of work is being done on remaining Department of Defense Joint Technology Office funds for optics development and simulations. The FEL team is ready to assemble the ring resonator when funding resumes.
Center for Theoretical and Computational Physics
Lattice QCD has proven itself capable of precision calculations for the quark masses, the strong coupling constant and a growing list of hadronic masses and matrix elements. There is a substantial effort to bring this level of precision to bear on nucleon matrix elements. Recent work in the Theory Center has developed an improved method that reduces the computational cost of the calculations of the nucleon matrix elements needed for the determinations of nucleon form factors, parton distributions and generalized parton distributions.
JLab Calendar of Events
March 2: Virginia Regional Middle School Science Bowl
Environment, Safety, Health and Quality
Prepare for Emergencies with the Ready Virginia Mobile App
Visit the VDEM webpage for more information and to download the app.
Computing and Networking Infrastructure
Internet Outage Scheduled for Monday, March 4
Science Series: Guesstimating the Environment
Come Learn About U.S. Patent System Changes and Celebrate JLab's Bright Ideas
Colloquium and Public Lecture: Applications of Electron Linacs to Isotope Production
Brown Bag Lunch Workshops with MIS
C100 Cryomodule Naming Event
2013 Benefits Open Enrollment Ends Friday
Tracking Thomas at JLab
Chase Dubbe correctly guessed the location for Feb. 20. Honorable mentions go to Michelle Shinn, Michael McCaughan, Harry Fanning, Anna Shabalina, Anthony DiPette and Mark W. Weihl. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.
|JLab Weekly Briefs is an ongoing publication providing information on the status of safety, accelerator operations, experiments, free-electron laser, reviews, upcoming activities and special events. Deadline for submission is every Tuesday by 10 a.m. Submit new items to: Public Affairs or contact Kandice Carter at x7263.|