Jefferson Lab Weekly Briefs September 16, 2009
Jefferson Lab Weekly Briefs
September 16, 2009
Experiment E05-109, HAPPEx-III, a measurement of the nucleon strange form factors at high Q2, continues taking production data in a reasonably smooth fashion in Hall A.
APS April Meeting Abstract Submission Deadline is Oct. 23
The accelerator delivered beam to the halls with some down times and issues. Magnets DOG2E and DOG3E tripped a few times and were fixed. RF (radiofrequency) separators tripped off several times and were scheduled to be acid flushed. During the Saturday swing shift, beam would not transport out of the injector, most likely due to a vacuum valve. After cycling some injector vacuum valves many times, Operations staffers were able to deliver beam again. Hall A Compton counts were unstable at times, and more troubleshooting is needed for this problem.
The FEL team was able to complete installation of the ultraviolet line and get most of it aligned last week. The UV line is fully under vacuum and the dipole strings have been powered up. The source of a water leak in one optical chicane magnet is an unauthorized joint in an interior winding; the team is swapping the coil with one used for the Light Pseudoscalar and Scalar Search (slow leak, so it can be used intermittently) while a re-manufacture of the coil is being arranged. Some tests on the Gun Test Stand regarding vacuum conditioning were also successfully performed. Lastly, the team completed the JLAMP Proposal for DOE Basic Energy Sciences.
A new chiral approach to analyzing reaction processes including the ground nonet pseudoscalar mesons has been developed <arXiv:0909.1606 [hep-ph]>. The approach treats effects of chiral symmetry breaking in the reaction processes without relying on any unphysical limits or expansion schemes and provides an appropriate theoretical basis for addressing the nature of broken chiral symmetry in the nonperturbative QCD domain. New chiral Ward identities for the gluon topological susceptibility and the decay amplitudes of π0, η, η′→ γ(*)γ(*) are derived, showing a significant role of the U(1) axial anomaly and the mass difference among u, d and s quarks in a model-independent way.
JLab's Safety Numbers
63 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
Sept. 14 - Nov. 20: The Jefferson Laboratory Upgrade to 12 GeV INT Program
Environment, Safety, Health & Quality
September is National Preparedness Month. The steps to preparing for an emergency are: (1) get a kit, (2) make a plan and (3) be informed. When preparing for a possible emergency situation, it's best to think first about the basics of survival: fresh water, food, clean air and warmth. Here is a list of recommended items to include in a basic emergency supply kit:
More information can be found on FEMA's Ready America website.
Flu Vaccine Still Available
JLab Adopt-A-Spot Litter Pick Up Set For Sept. 18
Learn About Influenza
SRF Colloquium Set for Oct. 1
No Puttering Around: Register Now for Oct. 8 Golf Tourney