Jefferson Lab Weekly Briefs May 7, 2014
Jefferson Lab Weekly Briefs
May 7, 2014
12 GeV Upgrade
On May 3, the first beam was delivered to the front section of the beamline to Hall D, thus demonstrating that all 5.5 passes of the accelerator were functional, and there were no obstructions in the way of the beam. That was done with each linac operating at 550 MeV, and the machine was then scaled up to 950 MeV in each linac to achieve greater than 10 GeV beam after 5.5 passes. Stable 10.5 GeV beam reached the Hall D beamline early this morning (May 7). This significant accomplishment completes a major 12 GeV Project milestone and puts Jefferson Lab one step closer to approval of Critical Decision-4A (Accelerator Project Completion and Start of Operations). It also sets a new energy record for beam from CEBAF. Authorization to put this beam into the Hall D tagger vault is being evaluated by the Chair of the Accelerator Readiness Review Committee, Manager of the DOE Site Office, and the Lab Director. When the authorization is given, the Head of Accelerator Operations and the commissioning team will send the beam down the new beamline into the Hall D tagger vault for the first time.
JSA Sabbatical and Research Leave Support at Jefferson Lab
Jefferson Lab Published Journal Articles, April 28-May 2
Remember to submit your papers for approval to the Jefferson Lab Publications database.
Records and Information Management Month Ends
Center for Theoretical and Computational Physics
The study of baryons in lattice QCD with different number of colors, Nc, has recently become available, with simulations carried out at different values of the quark masses, down to the realm where chiral symmetry plays an important role, and with Nc= 3, 5 and 7. Recent work has analyzed the lattice results for baryon masses within a framework that combines an expansion in 1/Nc and chiral perturbation theory, and constrains the Nc dependene of certain low energy constants. The new scheme helps to organize and understand baryon physics with the aid of an expansion in 1/Nc and to elucidate the spin-flavor properties of baryons.
The Machine Shop is presently manufacturing or continuing to manufacture:
Facilities Management and Logistics
Parking Lot Closure
Spring Cleanup Underway
During the cleanup, please be careful not to mix recyclables. In other words, wood scrap, recyclable metals, cardboard, paper and other permissible recyclable office waste go into the proper collection containers at the Central Materials Storage Area (CMSA). General waste is to be collected and brought to the CMSA’s “trash” compactor. For those who do not have access to the CMSA, the gate will be open daily this week, 10 a.m.-2 p.m., for your convenience.
Environment, Safety, Health and Quality
Portable Generator Safety
As always, follow the manufacturer guidelines for setup and operation. It is also strongly recommended to have a licensed electrician install your home generator.
Open House Volunteers Still Needed
See Jefferson Lab Researchers Speak at Particle Fever Debut
Jefferson Lab Calendar of Events
May 17: JLab Open House: Accelerating Discovery
|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.|