Jefferson Lab Weekly Briefs October 17, 2012
Jefferson Lab Weekly Briefs
October 17, 2012
12 GeV Upgrade
The 12 GeV Project Team and the JLab ESH&Q Division continue to make preparations for the Accelerator Readiness Review (ARR). The draft of the Final Safety Assessment Document (FSAD) was submitted to the Thomas Jefferson Site Office for review and all resulting comments have been reconciled. The updated FSAD will be submitted to the Site Office Manager by the end of the month for approval. The membership of the ARR review committee is being developed.
The lab is five months into the 16-month Long Shutdown, almost a third of the way through the installation period of the 12 GeV accelerator. Given the size, complexity and the mutual dependency of the activities in progress, staffers were aware from the start that 16 months were too many to plan rigidly and that the overall plan needed to be reassessed periodically. The time for a first reassessment of the lab-wide shutdown plan is in November. At almost six months into the down, staffers should have enough experience to know what is progressing well and where the delays exist. There are enough critical decisions ahead to make it worthwhile to stop and readjust the overall trajectory if needed. Staffers are starting this effort now with the goal to have the process completed, presented and discussed before Thanksgiving.
Center for Theoretical and Computational Physics
A new lattice QCD study has computed the potential between two static B mesons, parametrized by functional forms motivated by the quark model. Subsequently solving the Schroedinger equation for this system in the infinite volume has allowed the possibility of a tetra-quark bound state to be identified, with binding energy of about 50(5) MeV.
Work continued on the Hall D tagger shielding wall. The wall is approximately 70 percent complete. The northeast spreader (S1) stands have been installed and are being aligned. All the dipoles in pass one and three of the east arc have been refurbished and installed. The installation in pass 1 and 3 completes all the re-work on the dipoles that began with the west arc magnets during the Six Month Shutdown and finalized in the 12 month down. The 1st BCOM spreader/recombiner dipole is out of the machine shop and has been sent to the Magnet Measurement factory for re-assembly and testing. The machining of this magnet was completed using a new CNC machine, which has helped extend the capabilities of the machine shop. A replacement septum magnet coil has been received and has passed all testing prior to insertion in the magnet. A full testing must be done when the magnet is reassembled. The west recombiner stand modifications have been completed.
JLab Calendar of Events
Oct. 17: Colloquium and Public Lecture
Environment, Safety, Health and Quality
RadCon Posts Year-to-Date Doses
Spy Games Colloquium and Public Lecture on Oct. 17
Wear Pink for Breast Cancer Awareness Event
Last Chance to Sign Up for Cornhole at Oktoberfest!
Onsite Blood Drive Set for Tuesday, Oct. 23
JLab Commuter Survey Ends Oct. 23
Come Out and Enjoy JAG Oktoberfest!
Food Drive Underway Through Oct. 24
Congratulations this week go to Harry Fanning and Lori Zukerman, who were the first to correctly identify the location for Oct. 10. Honorable mentions go to Doug Higinbotham, Samika Hawkins and Robert Martin. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.