Jefferson Lab Weekly Briefs January 9, 2008
Jefferson Lab Weekly Briefs
January 9, 2008
Enrico Fermi Award Call for Nominations
Government Fellowships for Scientists
This period started off with Accelerator recovery from the holiday down, with many minor problems encountered and fixed. A rough steer-up of the machine was completed by the end of the first day. All of the experimental hall beamlines came next, with no major problems. Late during the swing shift on Friday, the Central Helium Liquefier (CHL) tripped due to a cooling water pump failure. By day shift on Saturday, both the CHL and the Accelerator had been recovered, and beam delivery operations resumed. However, just after midnight on owl shift, the CHL tripped again, due to a failure of compressor #6. This time, restoration went much better, and beam operations were resumed at 04:55. The shifts after this were fairly routine.
Free-Electron Laser (FEL)
Work in the FEL centered on preparing the Gun Test Stand to get the Personnel Safety Systems finished and qualified. The main FEL gun finished vacuum bake and is being prepared for reassembly and processing.
The Quark-Meson Coupling model, which has provided a very successful microscopic understanding of the widely used, density-dependent Skyrme forces, has been updated to incorporate the medium modification of the hyperfine interaction between quarks. When applied to hypernuclei, the new model produces some remarkable results, notably Σ hypernuclei are unbound and the overbinding of Λ hypernuclei found in earlier work is resolved. As before, the model provides an extremely natural understanding of the very small spin-orbit force in Λ hypernuclei and also predicts the existence of cascade hypernuclei.
JLab's Safety Numbers
112 Days since Last Recordable Accident (JLab record: 319)
JLab Calendar of Events
Jan. 11: APS April Meeting Abstract Submission Deadline
Environment, Safety, Health & Quality
Cold weather is on the way. Layering of cold weather clothing is a good way to make sure you stay warm. Basically, layering is several light to medium-weight clothing articles topped by a breathable shell. For times when you are less active, you can put on a heavier layer to stay warm. If you heat up, you can remove a layer to cool down. Pay attention to both the outside temperature and the wind speed. A high wind chill factor means more layers of clothing are necessary for protection against the cold. Below are some basic cold weather clothing layering tips:
Fermilab Activated Copper Theft Lesson Learned
This potential Fermilab radioactive material loss points out the importance of Lab staff being aware of radioactive material control and security concerns. Some radioactive materials (such as copper) may be prone to theft based on their intrinsic value. It is important to remember these basic radioactive material tips:
Adopt-A-Spot Litter Pickup Event on Jan. 25
TIAA-CREF Retirement Counseling