Jefferson Lab Weekly Briefs March 13, 2013

Jefferson Lab Weekly Briefs
March 13, 2013

12 GeV Upgrade

Conventional facilities construction for the 12 GeV Upgrade will resume with the award of a construction contract to upgrade the air conditioning systems in the North and South Linac Service Buildings. Approximately 30 tons of cooling will be added to each service building to handle the heat load from the new 12 GeV radiofrequency zones. The vendor site visit was held on March 12; vendor proposals are due March 28.

Free-Electron Lase

There was no Office of Naval Research effort on the main program this week, but Joint Technology Office work continued in optics and FEL simulation. The FEL team participated recently in the Basic Energy Sciences Advisory Committee meeting as observers. A new study of future light sources has been requested by Bill Brinkman, which will be monitored closely.

Center for Theoretical and Computational Physics

A new paper examines the QCD evolution of the helicity and transversity parton distribution functions, including their dependence on the parton transverse momentum. Using appropriate definitions of these polarized transverse momentum dependent distributions (TMDs), the dependence on the factorization scale and rapidity cutoff is derived. The results will be essential for phenomenological applications, especially for the analysis of the future JLab 12 GeV data.


The Installation group has completed the removal of the 6 GeV transport channel recombiner magnets and stands. The new floor-to-ceiling stands for this region were assembled and installed. Stands for the second extraction region were also assembled and installed. The beam switch yard lines A and B have had all the girders and dipoles removed for upgrade work. Additionally, work continues on the removal of line C magnets. The new line D pedestals have been installed up the ramp to the shield wall. Girders and dipoles were installed in the second spreader and low-conductivity water work is ongoing there, as well as at the first recombiner. The Vacuum group has been supporting beamline work in Hall A, cleaning and leak checking vacuum chambers for septa magnets, continuing with girder rebuilds, and connecting warm region girders in the linacs.

JLab Calendar of Events

March 13: Colloquium and Public Lecture
March 17-19: C-REX Workshop
March 25: Safety Shoe Vendor onsite
March 26: JAG Annual T-Shirt Contest Entry Deadline
March 27: AcuCal Equipment Calibration pickup
April 17: Teacher Night at JLab
April 18-20: Q-weak Collaboration Meeting
April 30: Colloquium and Public Lecture
April 30: Science Series: The Higgs Boson and Our Life


Environment, Safety, Health and Quality

JLab workers use acronyms or abbreviations by the score. In Industrial Hygiene, the acronyms TLV and PEL are frequently used in reference to dusts, gases and fumes. TLV and PEL represent Threshold Limit Value and Permissible Exposure Limit, respectively. Both refer, for the most part, to the allowable concentration of dusts, fumes and gases in the air for a chemical (other hazards such as heat, noise and etc. also have TLVs). Each concentration is based upon an eight- or 10-hour time weighted average exposure for a five-day work week. Studies and experience have determined that the typical adult worker can be exposed to this concentration for a 40-year working lifetime and not develop an adverse health effect. JLab uses the lowest exposure limit, which is generally the TLV.

Exposure concentrations ascertained from quantifiable air monitoring at JLab are generally either not detectable or significantly below these exposure limits. If you have questions regarding TLVs or PELs, contact either Dick Owen, x6381, or Jennifer Williams, x7882.


Got a Green Thumb? Take the JLab Garden Club Survey!
Here’s a "green idea" for employee participation in JLab’s sustainability efforts….. How about a JLab Community Garden right here on site! The idea is to provide the JLab workforce with an area to grow plants. If you're interested, look for the Garden Club Survey to be posted on the JAG website later this week. The cutoff date for the survey will be March 31.

2013 Annual T-Shirt Contest Is Underway
The race to create the winning design for JLab's Annual T-shirt contest is on! Entries are due before close of business on March 26. Lab staff and users will then vote online for the best design. The winning design will be unveiled at the lab's annual Run-A-Round, which is scheduled for Wednesday, May 22. Here is a list of the official rules for this year's contest:
The submission should include a front (pocket) and back design. "Jefferson Lab," "DOE," "JSA, LLC," and "2013" must be included in the design. Resubmission of previous non-winning designs is welcome.

  • The winning design will become the property of JSA, LLC/JLab.
  • Designs may be subject to slight change to suit screen-printing limitations.
  • Designs may be submitted electronically or as hand drawings. A copy of all entries must be submitted in color on 8.5" x 11" paper.
  • All submissions must provide a contact name, division and telephone number.
  • All submissions must provide a contact name, division and telephone number.
  • Designs and questions should be submitted by email to Bridget Paul, x7306, or dropped off at ARC Rm 225B.
  • All designs will be posted on the JAG webpage. Online voting starts March 27 for all JLab employees and users (one vote per person).
  • The winning designer(s) will receive a free T-shirt and recognition. If the winning design is submitted by a team, each member will receive a T-shirt.

Previous winning JLab T-shirt entries are available for viewing online.

Reminder: Tornado Response Survey
On March 12, JLab participated in the annual Virginia Department of Emergency Management statewide Tornado Drill. If you haven't yet, take a few minutes sometime today to complete the survey associated with that drill. It takes five minutes or less to complete and is anonymous.

Colloquium and Public Lecture: The Origin(s) of the Heavy Elements
The rapid neutron capture process (r-process) is thought to be responsible for the creation of more than half of all elements beyond iron. Yet, the site for the r-process was labeled as one of eleven greatest unanswered questions in physics. Ani Aprahamian, the Freimann Professor of experimental nuclear physics at the University of Notre Dame, will discuss the work to determine the most crucial nuclei to measure using an r-process simulation code based on sensitivities to various basic nuclear properties, such as nuclear masses, beta decay rates, neutron capture cross-sections, and beta-delayed neutron emissions. Results from this research have been used and will be used to determine the experimental programs of radioactive ion beam facilities worldwide. The colloquium is offered in the CEBAF Center auditorium at 4 p.m. on March 13.

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 Friday.

Becky Mosbrucker correctly guessed the location for March 6. Honorable mentions go to Maurizio Ungaro, Annie Tran, DeAnn Maddox, Michael Haddox-Schatz, Ryan Bodenstein, Stephanie Vermeire, Casey Heck and Brita Hampton. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.


JLab Weekly Briefs is an ongoing publication providing information on the status of safety, accelerator operations, experiments, free-electron laser, reviews, upcoming activities and special events. Deadline for submission is every Tuesday by 10 a.m. Submit new items to: Public Affairs or contact Kandice Carter at x7263.