Jefferson Lab Weekly Briefs August 19, 2009

Jefferson Lab Weekly Briefs

August 19, 2009

12 GeV Upgrade

Construction of the Hall D Barrel Calorimeter detector is underway at the University of Regina in Saskatchewan, Canada. Production shipments of the Kuraray scintillating fibers are arriving according to schedule, and the first shipment of lead has been received and passed acceptance tests. Procedures for fabrication of the first article construction module have been finalized, and the base lead layer has been successfully glued to the aluminum base plate.


The Scheduled Accelerator Down ended on Aug. 17, with a lot of work done. Ops restored 5.97 GeV accelerator operation successfully over the weekend. Continuous wave beam (5 μA) was established to the beam switchyard dump. On Monday, the accelerator was scaled down to 5.764 GeV.

Free-Electron Laser

The FEL team had a successful week of operation devoted to beam measurements and optics characterization. Staffers also did some preparation for user runs on the Light Pseudoscalar and Scalar Search experiment by providing alignment beam to several labs and operating at secondary wavelengths.

Theory Center

A fully relativistic calculation of the polarized 2H(e,e'p)n reaction has just been performed <arXiv:0907.3712 [nucl-th]> at large Q2 in the impulse approximation, employing the Gross equation to describe the deuteron ground state and the SAID parametrization of the full nucleon-nucleon scattering amplitude to describe the final state interactions. The target spin asymmetries are shown to be sensitive to the full spin structure of the final state interaction. The results of this calculation are being used in support of the JLab E93-009 experiment in Hall B (EG1 run group).

JLab's Safety Numbers

35 Days since Last Recordable Accident (JLab record: 331)
343 Days since Last Lost Workday Accident (JLab record: 676)

JLab Calendar of Events

Aug. 19: Jefferson Activities Group Luau
Aug. 19-21: GPUs for Lattice QCD Workshop
Aug. 26: Colloquium and Public Lecture
Aug. 27: Safety Shoe Vendor onsite
Sept. 2: EAP Seminar: Stretching Your Dollar
Sept. 7: Labor Day holiday
Sept. 17: JSA's Electronic Commerce Vendor Show




Environment, Safety, Health & Quality

Excessive heat exposure caused 8,015 deaths in the U.S. from 1979-2003. More people died from extreme heat in this period than from hurricanes, lightning, tornadoes, floods and earthquakes combined.

People suffer heat-related illness when their bodies can't properly cool themselves. The body normally cools itself by sweating; under some conditions, sweating isn't enough. As a person's body temperature rapidly rises, damage can occur to the brain and other vital organs.

To protect your health when temperatures are extremely high, remember to keep cool, use common sense and use the following tips:

  • Avoid hot foods and heavy meals—they add heat to your body.
  • Drink plenty of fluids and replace salts and minerals in your body. Do not take salt tablets unless under medical supervision.
  • Dress infants and children in cool, loose clothing and shade their heads and faces with hats or an umbrella.
  • Limit sun exposure during mid-day hours and in places of potential severe exposure such as beaches – use sunscreen.
  • Protect those at risk: keep infants and the elderly in air-conditioned spaces; do not leave infants, children, or pets in a parked car.
  • Provide plenty of fresh water for your pets, and leave the water in a shady area.
  • Monitor those at high risk and use a buddy system when prudent.
  • Know the symptoms of heat disorders and overexposure to the sun, and be ready to give first aid treatment or call 911.

For more information, visit the Centers for Disease Control "Extreme Heat" website.

Computing and Networking Infrastructure

Helpdesk Summer Hours Ending
The IT Division Helpdesk will be closing in the afternoons starting on Monday, Aug. 24. After that date, the Helpdesk will be open from 8 a.m. until noon, Monday through Friday.


Nuclear and Particle Physics at the Spallation Neutron Source
Dr. Geoff Greene, University of Tenn. and Oak Ridge National Lab, will present this colloquium and public lecture in the CEBAF Center auditorium at 4 p.m. on Wednesday, Aug. 26.

Register for a Personal Finance Lunchtime Seminar: Stretching Your Dollar
This bring-your-own-lunch seminar will take place in CEBAF Center room F113, noon-1 p.m. on Wednesday, Sept. 2. It offers tips and techniques on how to save money, no matter how much you make! It will offer useful short and long-term savings options and insightful ideas on how to make effective decisions about tracking and spending your money. Make a budget and make a difference. Facilitated by Optima's Employee Assistance Program. Registration is required due to limited space. To sign up, contact Betty Beeler ( x6999 or Bruce Ullman ( x7170.

Public Tours Briefly Suspended
Due to the experiment schedule and a number of tours scheduled in conjunction with upcoming reviews, Public Affairs has suspended general and public tours for the remainder of August and the month of September. Public tours will resume in October. Campus drive-through tours will still be available as needed on new employee orientation dates.

Remembering Camille 40 Years Later
Hurricane Camille was a Category 5 hurricane when it flattened the Mississippi Gulf Coast on this day in 1969. Several days later, although the storm had weakened to a tropical depression, it wreaked havoc on communities in Virginia with 27 inches of rain and contributing to 153 deaths in Virginia (256 total). The storm led to the creation of what is now known as the Virginia Department of Emergency Management. Read more about this natural disaster on PilotOnline.