Jefferson Lab Weekly Briefs
August 3, 2011

12 GeV Upgrade

The subcontractor for the beam switchyard addition and the new tunnel penetrations mobilized on Aug. 1. Existing utilities are being relocated this week in preparation for the new work. Next week, the subcontractor will start erection of the steel for the expanded power supply room and start drilling the earth to the tunnel roof. The tunnel penetration construction is an 11-step process to ensure a water-tight sleeve to the tunnel roof prior to core drilling the concrete tunnel roof. The tunnel is below the water table, and the water-tight sleeve is needed to keep groundwater from entering into the tunnel during construction of the new penetrations.

Accelerator

The eleventh scheduled week of the Six Month Shutdown went well. Checkout for the injector experiment (PEPPo) continues. In the magnet refurbishment and re-installation program, stack 8 magnets in the east arc have been completed and DC power checks for the east arc are ongoing; in the west arc, magnet alignment is underway. Four cryomodules saw action this week: 2L21 (nicknamed The Admiral) was removed to the Test Lab; alignment was completed for 2L23; testing continues on 2L24; and installation continues on 2L25. Many other tasks were continued or started.

Free-Electron Laser

This week, FEL staffers continued high-voltage commissioning of the gun (first in vacuum and then in krypton), achieving 395 kilovolts.

Center for Theoretical and Computational Physics

Semi-inclusive deep-inelastic scattering experiments, such as those performed at JLab, allow us to probe the motion of quarks inside the proton in terms of transverse momentum dependent parton distribution functions (TMD PDFs); this information, however, is convoluted with fragmentation functions (TMD FFs) and soft factors. It has long been known that weighting the measured event counts with powers of the hadron momentum before forming angular asymmetries de-convolutes TMD PDFs and TMD FFs in an elegant way -- but at the expense of introducing an undesirable sensitivity to high momentum contributions. Using Bessel functions as weights, a new paper finds a natural generalization of weighted asymmetries that preserves the de-convolution property and soft-factor cancellation, yet allows less sensitivity to high transverse momenta.

JLab Calendar of Events

*Note: calendar links may not be available offsite*
Aug. 3: Colloquium and Public Lecture, CC auditorium, 4 p.m.
Aug. 4: Cryogenics Seminar
Aug. 8: Safety Shoe vendor onsite
Aug. 16: Cryogenics Seminar
Aug. 22: Safety Shoe vendor onsite
Aug. 22-26: PAC 38
Sept. 5: Labor Day holiday; JLab closed

 

 

 

Environment, Safety, Health and Quality

The hurricane season is in full swing, with Tropical Storm Emily now churning in the Caribbean and predicted to impact the East Coast. Now's a good time to review your preparations for staying safe pending landfall of a hurricane or tropical storm. The Virginia Department of Transportation has issued the interactive Virginia Hurricane Evacuation Guide, which provides information regarding evacuation routes, shelters and essentials to include in evacuation kits. For additional severe weather preparation and planning guides, visit the Virginia Department of Emergency Management. Finally, stay informed about potential tropical threats and track storms on the National Weather Service's National Hurricane Center website.

Announcements

JLab Website Is Available from Offsite
If you are offsite, you can now reach most of JLab's existing website at http://www.jlab.org. This link can also be used if you are onsite at JLab. The temporary public-facing website that was created following the recent cyber attack will soon be replaced with a fully functional website.

Open House Save the Date: May 19, 2012
While not yet announced to the public, internal planning is underway for the next JLab Open House. If you have suggestions or would like to volunteer for the Open House programming committee, contact Michelle Lechman. All ideas and volunteers are welcome.

Onsite TIAA-CREF Counseling Offered
TIAA-CREF will offer individual counseling sessions onsite on Aug. 24, Oct. 7, Nov. 4, Nov. 17 and Dec. 8. In these sessions, employees can discuss their personal financial situation with a TIAA-CREF consultant on a confidential basis. To discuss your plan and options for managing your retirement savings or to schedule an appointment with a TIAA-CREF individual consultant, call TIAA-CREF at (800) 732-8353, Monday-Friday, 9 a.m.-8 p.m.

Mont on the Six Month Shutdown
The latest Montage has been posted to the JLab website. Montage is an ongoing series of articles about issues affecting the lab written by JLab Director Hugh Montgomery. Click the link for Montage or access it via the JLab homepage.

Six Month Shutdown Safety Briefing
The video of the July 21 all-staff meeting to discuss the progress of the Six Month Shutdown project, including recent safety incidents, is now available on the web.

DOE Food Drive Ends Friday
The Thomas Jefferson Site Office (TJSO) has invited lab employees to participate in the "Feds Feed Families" food drive. Anyone wishing to participate may place non-perishable donations (non-glass items) in the marked barrels located in the CEBAF Center lobby through Aug. 5. For more information on the program, see the website or contact Steve Neilson at x7215.

Engineering Announces Special Cryo Seminars
Two cryogenics seminars, part of the Engineering Division's Professional Development Program, will address recent developments in cryogenics. The Aug. 4 seminar is titled: Cold End Process Options for Nominal 2 Kelvin Efficiency Improvements; and the Aug. 16 talk is titled: JLab's 12 GeV Compressor System and Development Work. Each event is scheduled for 1:30-3 p.m. in the CEBAF Center auditorium. For additional information, see the Cryogenics Seminars poster. General inquiries about these seminars or the Engineering Division's Professional Development Program may be directed to Gayle Coleman, x7712.

Save the Date: JAG Luau Set for Wednesday, August 17
The JAG Luau is open to all lab employees and their families, users and students, and will be 3-6 p.m. on Wednesday, August 17, on the lawn behind the Residence Facility. Refreshments will include summer favorites: hamburgers, hotdogs, chips, cold beverages and special treats. Look for more details as the event nears.

Tracking Thomas at JLab
Little Thomas is visiting all corners of the JLab campus. If you can identify his location this week, email Kandice Carter with your guess. Guesses are accepted through Fridays.

Congratulations to Dave Fazenbaker, who was the first person to correctly identify the July 27 location. Honorable mentions go to Jason Willoughby, Stephen Smith, Stephanie Vermeire, Linda Ceraul, Bobby Lawrence, Lori Lawson, Marty Hightower, Andy Kowalski, Cynthia Lockwood, Michael Haddox-Schatz, Rob Mahurin, Jodi Patient, Deborah Dowd, Lawrence Ferbee and Doug Higinbotham. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.