Jefferson Lab Weekly Briefs
November 25, 2009

12 GeV Upgrade

Using the short accelerator shutdowns in January and July 2010 is critical for the success of the 12 GeV installation work planned for the six-month down, which includes up to five commissioned cryomodules in the South Linac and machining/refurbishment of the west arc dipole magnets. The 12 GeV installation activities for the January 2010 down include radiofrequency waveguide installations and cryomodule base plate swaps. The 12 GeV installation work for these two downs is reviewed, approved and coordinated with existing activities through teamwork with 6 GeV operations personnel and the use of existing work planning tools.

Physics

In Hall C, removal of the hypernuclear experiment E05-115 and installation of Q-weak continues. The High Resolution Kaon Spectrometer and High Resolution Electron Spectrometer shield houses are being disassembled, and the custom beamline chicane has been removed. The beamline upgrade to accommodate a Compton polarimeter is underway. The beamline downstream of the green wall has been removed, and a new platform that will support beamline elements and the Moller polarimeter is being installed in the hall.

Accelerator

Overall, the accelerator was running well with high current (110uA) to Hall A and low trip rates. At one point, beam was running for more than an hour without any interruption. There were some hardware issues, which have been resolved. Several devices were replaced: a cooling water hose of zone 1L04, the hunt adder MAN5R04 power supply, some faulty parts in zone 0L04, and the vacuum valve 2L12A position indicator.

Free-Electron Laser

The high reflector can for the Ultraviolet FEL was put under vacuum for the first time. The FEL team ran injector and drive laser tests and also made important strides in the operation of the control systems for the UV and infrared lines, which is critical for efficient UV commissioning. The team continued efforts for the JLAMP proposal to be submitted to DOE Basic Energy Sciences in mid-December.

Theory Center

Seven of the eight magnetic moments for the baryon octet (nucleons, Λ, Σ and Ξ) have been measured, and attempts to explain them using flavor SU(3) symmetry have long been a topic of interest. In a paper just submitted <arXiv:0910.2171 [hep-ph]>, JLab theorists used these experimental numbers, together with SU(3) symmetry and the covariant spectator theory, to make a model-independent estimate of the size of the pion cloud corrections to these moments. The results indicate that the pion cloud contribution to the nucleon magnetic form factors at zero momentum transfer is about 40 percent, considerably larger than many previous estimates.

JLab's Safety Numbers

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

JLab Calendar of Events

Nov. 26-27: Thanksgiving holidays - JLab closed
Dec. 5: JLab Children's Holiday Party
Dec. 9: Science Series Lecture: Visualizations and Visual Illusions
Dec. 10: Safety Shoe Vendor onsite
Dec. 16: Colloquium and Public Lecture, 3 p.m., CC auditorium
Dec. 24 - Jan. 1: Winter holidays/Shutdown days - JLab closed

 

 

 

Environment, Safety, Health & Quality

While wet leaves, mud and wet surfaces tracked into buildings add an additional burden for maintaining safe working surfaces, these same conditions can make safe driving a challenge - especially in rural areas. Wet leaves that have accumulated on the roadway are extremely slippery, making the driving conditions similar to driving on ice. Besides reducing the car’s traction, causing skidding and the possibility of losing control of the vehicle, leaves often cover the painted road markings, making it difficult to know the locations of the lanes. Here are a few reminders for driving on slick, wet or icy roads:

  • Slow down if you are driving on a road covered with leaves, especially when driving around turns. Leaves make it difficult to see potholes and bumps in the road.
  • Allow yourself plenty of room to stop in an emergency. Anti-lock braking systems have been known to under-perform on wet leaves and snow-covered ice. While an ABS allows the driver to reduce speed with better control, the systems have allowed all wheels to lock, while the car continues to slide.
  • A pile of leaves raked to the side of the road is an inviting place to a child. Children enjoy jumping into the leaf piles or burrowing down into them and hiding. Never drive through a leaf pile and use caution where children are playing.
  • Keep your windshield free of leaves.
  • In order to avoid the possibility of a fire hazard from the exhaust system or catalytic converter, never park your vehicle over a pile of leaves.

Announcements

Performance Appraisals
We are nearing the last phase of this year's appraisal process. Supervisors should begin delivering appraisals to their employees upon notification that the Human Resources Review is complete. All performance appraisals are to be delivered by Dec 14. If your appraisals are not yet out of the division calibration and ready for HR Review, please move them along. HR will review and return them to you with minimal turn-around. If you have problems or questions, contact Bruce Ullman (x7170) or Cassandra Andrews (x7068).

Promotion Cycle
Promotion packages should be reviewed by the Division Leader during the next two weeks, with all final packages received in HR by Dec. 7. If you have questions concerning the process, contact Doug Roeder (x7576) or Cassandra Andrews (x7068).

New Additions to Property Manual
Two new sections have been added to the JLab Property Manual: Acquisition & Control of Potable Alcohol and Acquisition & Control of Non-Medical Hypodermic Needles & Syringes. Both documents have been added to Appendix D. If these new additions pertain to your work area, you may review them by clicking the links. The links are also available on the Property webpage. Anyone with questions about the new documents may e-mail Tom Briggs.

Mobile Mammography Unit Onsite
The Sentara Mobile Mammography Unit will be here at Jefferson Lab on Dec. 7, from 9 a.m.-2 p.m. This service is open to all employees as well as their family members or friends, since personal health insurances will be billed. To make an appointment, call 1-800-SENTARA (736-8272).

'Tis the season for E-Card Scams
Cybersecurity staff report that several JLab computer users have already fallen victim to fake e-cards containing computer viruses. Legitimate e-card notifications will always include the actual name or personal e-mail address of the sender. Visit the Greeting Card Association website for tips on how to identify legitimate and safely retrieve e-cards.

Get Ready for the Holidays!
The Jefferson Acitivities Group is sponsoring a plethora of holiday activities. For a quick rundown on the Children's Holiday Party, the Door and Cubicle Decorating Contest and the Toys for Tots Toy Drive, see the posters onsite or read the e-mail online.

JLab Key Validation Continues
The validation of all JLab-issued keys will continue through Dec. 16. A link to the validation page and more information is available in the all-staff memo.