Jefferson Lab Weekly Briefs January 21, 2009
Jefferson Lab Weekly Briefs
January 21, 2009
JSA Accepting Applications for Graduate Fellowships at JLab
The accelerator has been running well with the electron gun configured at 85 kV. The cavities have also performed well, with low trip rates. The cold weather caused a supply water pipe to freeze and a valve to leak at the End Station Refrigerator. The leak was found and repaired over the weekend, interrupting beam delivery for a couple of hours.
Free-Electron Laser (FEL)
The FEL is performing reasonably well; FEL staff spent the week addressing several measurement tasks in the Office of Naval Research and Joint Technology Office statements of work. Key measurements were performed on optical gain of the system, as well as low energy injection. Setup for 0.9 micron lasing was begun. Some measurements were also made on a new approach for FEL outcoupling with a broadband scraper that looks very advantageous at low-average power.
The nucleon, Σ and Ξ octet baryon electromagnetic form factors and the effects of SU(3) flavor symmetry breaking are studied in a new, unquenched lattice QCD calculation (arXiv:0812.4456 [hep-lat]) with (2+1) quark flavors. The charge radii and magnetic moments are extrapolated using three-flavor heavy-baryon chiral perturbation theory, finding the known octet values to be less than four standard deviations from experiment, with the discrepancies possibly due to remaining chiral and continuum extrapolation errors. The radii of the Σ+ and Ξ- baryons are predicted to be 0.67(5) and 0.306(15) fm2, respectively.
JLab's Safety Numbers
16 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
Environment, Safety, Health & Quality
On Jan. 5, a kitchen worker received first-degree burns to her left hand while cooking. She immediately obtained medical help and reported the event to her supervisor. Certain details of this event make it a recordable injury, our first in FY09. A DOE CAIRS (Computerized Accident and Incident Reporting System) entry has been initialized, as well as a Jefferson Lab Notable Event.
The 2008 OSHA Summary of Work-Related Injuries and Illnesses is posted on Insight. This summary classifies recordable injuries across Jefferson Lab for calender year 2008. There were a total of three cases for the 12-month period, resulting in 18 cumulative days away from work and 71 days of work restriction.
Additionally, a "Lesson Learned" document concerning unplanned Oxygen Deficiency Hazard (ODH) horn disassembly was posted for sitewide viewing. This lesson deals with the prevention of self withdrawal of side-set screws, which provide structural integrity for the ODH horn unit. This lesson was also submitted to the DOE database for complex-wide distribution.
Computing and Networking Infrastructure (CNI)
JLab Computer Purchasing Policy (EPEAT)
All Radiation Workers: General Access RWP
Tech Stockroom Reopens Feb. 1
Come Out and Play on the JLab Softball Team
Be a BEAMS Volunteer!
Time to Update Federal, State Tax Withholdings
Employees can view their current withholding exemptions and make changes through the Employee Self Service System (ESS). The forms are also available on the Internal Revenue Service and Virginia Department of Taxation websites. The Commonwealth of Virginia VA-4 Personal Exemption Worksheet is also available online. For additional assistance, contact Sharon Hay at x7620, or Janet Smith at x7503.
TIAA-CREF Retirement Counseling Sessions
American Red Cross Blood Drive
HRSD Seeks Applications for Pollution Prevention Award