Jefferson Lab Weekly Briefs February 3, 2010
Jefferson Lab Weekly Briefs
February 3, 2010
12 GeV Upgrade
Two significant tasks were completed for 12 GeV civil construction. The 5-ton bridge crane was installed in the Central Helium Liquefier building addition. The floor slab for Hall D was placed with approximately 900 cubic yards of concrete (see photos at www.jlab.org). With more than 100 trucks of concrete to place, the operation was done in two, 24-hour sequences. The first sequence started at 2 p.m. on Jan. 26., and the second sequence started at 8 p.m. on Jan. 28. For proper curing of the concrete, the temperature around the slab was monitored around the clock and maintained above 50 F with the use of propane heaters and blankets.
The Injector Two Wein Flipper project passed its final vacuum leak check. Final alignment of new components was completed. Restoration began of beamline components previously removed for the INJTWF project. The leaking cryomodule at NL06 was removed to the Test Lab. Its replacement will be the C-50 cryomodule originally scheduled to go in the South Linac. New waveguide installations were completed [needed for the additional cryomodules planned as part of the 12 Gev Upgrade]. The chiller loop glycol leak was fixed. A site power loss was attributed to the weekend snow storm.
FEL staff continued to explore possible options for the JLAMP design and are narrowing options that preserve infared/ultraviolet capabilities. Stabilization of the drive laser phase has been achieved to 0.5 degrees of phase. There has been a delay in setting up the new cryomodule.
Challenging high-performance computations of quantum chromodynamics (QCD) on the lattice are required to predict the internal structure of the proton from first principles. A recent publication <arXiv:1001.3620 [hep-lat]> provides results and detailed discussions of electromagnetic charge radii, form factors, the spin and angular momentum decomposition and other quantities accessible from moments of vector and axial vector generalized parton distribution functions (GPDs). Higher precision and more realistic pion masses (down to 290 MeV) are complemented by extrapolations to the physical point, testing a variety of chiral expansion schemes and comparing to experimental values.
JLab's Safety Numbers
12 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
Feb. 6: Virginia Regional High School Science Bowl
Environment, Safety, Health & Quality
Walking on slippery surfaces (such as snow and ice) can put you at risk for slips and falls. This is particularly true when slippery conditions caused by ice and melting snow are infrequent. Interestingly, demographics on slips and falls show that elderly women are most frequently injured, along with a significant fraction of young men (age group 20-29).
JLab has a snow removal plan that ensures that pathways from parking lots to main building entrances are cleared of snow and ice. Use these cleared pathways to access your work space. Main building entrances have buckets of sand that are available to spread on slippery surfaces. Remember to be cautious even after you enter a building, because saturated floor mats can lead to slippery floors. Contact your Safety Warden if you need support to mitigate local slippery conditions and Facilities Management (ext. 7400) and Logistics for snow and ice clearing.
Computing and Networking Infrastructure
Using a Personal Cell Phone as a Pager
Pages can be sent from the laboratory's main search page or e-mail addressed using the format USERNAMEemail@example.com. Other paging methods, including directly dialing 584-xxxx, will not work with text-message paging.
General Access RWP Signature Deadline Past
Follow Procedure when Moving Hazardous Materials at JLab
Get Ready for the Big Game at Quark Cafe's Tailgate Party
Quark Cafe Recharge Wednesdays
TIAA-CREF Individual Counseling