Jefferson Lab Weekly Briefs December 5, 2012
Jefferson Lab Weekly Briefs
December 5, 2012
12 GeV Upgrade
Assembly of the ninth C100 cryomodule is nearing completion. Assembly of the tenth and final C100 cryomodule is well underway. Work on the new radiofrequency zones is going well: testing into shorts has started for the fifth new zone and installation of the sixth and seventh zones is underway. The cryogenics systems for Hall D solenoid is nearing completion and is on track for the start of solenoid cooldown in mid-December. Re-installation of the east recombiner is nearly complete. Fifty-nine of the 65 one-meter spreader/recombiner dipole magnets have been re-worked. All magnets continue to meet specifications. Field mapping of the first three-meter long ZA septum is underway; the second ZA magnet has been received. All Instrumentation & Controls/Safety Systems will be ready on schedule for Hall D solenoid cooldown and linac cooldown.
In Hall C, Short Orbit Spectrometer deconstruction has continued with the removal of the large shield house doors. The paper "Observation of the Helium 7 Lambda hypernucleus by the (e,e'K+) reaction," based on experiment E01-011, has been accepted for publication by Physical Review Letters. The paper, "A detailed study of the nuclear dependence of the EMC effect and short-range correlations," based on Hall C and other data, has been accepted for publication in Physical Review C.
2013 Postdoctoral Research Prize Deadline Nears
2012 Thesis Prize Program Open for Submissions
JSA Awards $412K for FY13 Initiatives Fund Program
FEL staffers are commissioning the gun in preparation for a start of operations next month and are using a combination of krypton and vacuum processing. The team achieved 400 kilovolts with krypton and 359 kV, on the way to the goal of 370 kV under vacuum.
Center for Theoretical and Computational Physics
The light-cone momentum distributions of pions in the nucleon have been computed in chiral effective theory using both pseudovector and pseudoscalar pion-nucleon couplings. For the pseudovector coupling, the analysis identified δ-function contributions associated with end-point singularities arising from the pion-nucleon rainbow diagrams, as well as from pion tadpole diagrams which are not present in the pseudoscalar model. The results pave the way for phenomenological applications of pion cloud models that are manifestly consistent with the chiral symmetry properties of QCD.
JLab Calendar of Events
Dec. 8: JAG Children's Holiday Party
Environment, Safety, Health and Quality
Holiday Decoration Fire Safety
If you are unsure about the use of a decoration, call Dave Kausch, x7674, or Tim Minga, x7310, for advice.
JLab to Test Tornado Warning Siren Friday at 10:30 a.m.
Personal Dosimeter Change Out Set for Dec. 17
Additional Date Offered for Onsite TIAA-CREF Counseling
Toys For Tots Toy Drive Underway
Children’s Holiday Party Set for Dec. 8
Volunteers Needed to Help With Children’s Party
Annual Open Enrollment for TIAA-CREF 401(k) GSRA Ends Friday, Dec. 14
Ready, Set, Hang Those Decorations
Tracking Thomas at JLab
Congratulations this week go to Samika Hawkins, Maurizio Ungaro and Annie Tran, who were the first to correctly identify the location for Nov. 21. Honorable mentions go to Debra Brand, Jason Willoughby, Elaine Zuchowicz, Debbie Campbell, Chase Dubbe, Michael Haddox-Schatz, Christopher Wicker, Michelle Shinn, Ryan Bodenstein, Gwyn Williams, Casey Heck, Andrea Celentano, Silvia Niccolai and Harry Fanning. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.