Jefferson Lab Weekly Briefs
June 11, 2008
In Hall A, production running for experiment E08-007 (Measurement of the Proton Elastic Form Factor Ratio at low Q2) has been successfully completed. All of the data at the nine scheduled kinematics have accomplished the projected error bars.
The g12 run group in Hall B was successfully completed Monday at 10 p.m. g12 combines two photoproduction experiments: searches for new hadronic matter in the meson and the baryon sector. Besides this major focus, the run also included a measurement of pion production from protons at large scattering angles to test scaling in exclusive reactions, a study of vector meson decays into e+e- pairs, and a pioneering study of time-like deeply virtual Compton scattering (DVCS), i.e. gamma + proton => electron + positron + proton, where the electron-positron pair has an invariant mass above the phi meson.
This period of beam delivery was very successful and ended with the start of the Scheduled Accelerator Down (SAD). The three experimental halls divided 308 hours of beam delivery. The only significant problems were due to Central Helium Liquefier (CHL) compressors tripping off. CHL staff quickly fixed the problems and brought the compressors back online, which allowed Operations staff to restore the accelerator to continuous wave beam operations.
Free-Electron Laser (FEL)
The FEL trained the first set of folks in the new Laser Personnel Safety System. FEL staff also supported the DOE ES&H Inspection audit, including nanotube material controls, beamline installation activities and gun test stand operations.
A fully relativistic calculation of the D(e,e'p)n reaction in the impulse approximation has been performed (arXiv:0805.3115 [nucl-th]) using the SAID parametrization of the full NN scattering amplitude to describe the final state interactions (FSI) of the proton and neutron. Kinematic regions where various parts of the FSI are relevant are identified and the theoretical uncertainties connected with calculations at high missing momenta are discussed.
JLab's Safety Numbers
266 Days since Last Recordable Accident (JLab record: 319)
JLab Calendar of Events
June 2-13: DOE ES&H Inspection - Onsite Inspection Visit
Environment, Safety, Health & Quality
FEMA is reminding the public that this is National Safety Month, sponsored by the National Safety Council. Throughout June, the NSC is targeting the most significant causes of unintentional inuries and deaths at home, in the workplace, and on the road.
FEMA Regional Administrator Susan Reinertson urges people to enhance their awareness of the importance of personal preparedness, 72-hour emergency kits and family disaster planning. Take the first step by viewing Are You Ready? In-depth Guide to Citizen Preparedness online from the Department of Homeland Security. JLab's emergency procedures can be found in JLab ES&H Manual Chapter 3510, Emergency Management Plan.
For more information on National Safety Month, visit the NSC website.
Computing and Networking Infrastructure
Adobe Flash Player Plug-in Upgrade
Pager System Fully Functional
Safety Shoe Truck Fills Approved Orders on June 12
JLab Property Inventory Begins This Week