Jefferson Lab Weekly Briefs
December 1, 2010

12 GeV Upgrade

12 GeV installation planning for the upcoming six-month accelerator shutdown (May – November 2011) incorporates transfer of 12 GeV equipment ownership, as appropriate, to the Accelerator Division. Related equipment documentation, training and commissioning plans are being developed to ensure smooth integration into the existing accelerator. 12 GeV participation in weekly labwide integrated schedule meetings continues to ensure effective communication and optimized installation work planning.

Physics

Hall B has successfully completed the PrimEx-II run, a high-precision measurement of the π0 lifetime. This is a fundamental quantity predicted directly from QCD. The installation of the eg5-TPE experiment has been completed. The goal of this experiment is to directly measure the two-photon contributions to elastic electron-proton scattering. This experiment will help clarify large discrepancies observed in elastic scattering experiments at JLab and worldwide when using different measurement techniques to determine the electromagnetic form factors of the proton. The Hall B experiment will use a beam with an equal mix of electrons and positrons and measure the ratio of elastic electron-proton to positron-proton cross sections. This ratio depends directly on the two-photon exchange contributions.

PAC 37 Proposals Due Today
The Program Advisory Committee (PAC 37) will meet the week of Jan. 10. The PAC will review new proposals for the 12 GeV physics program, which are due no later than Dec. 1. The PAC will also assign scientific priorities and beamtime to already approved proposals, and review and assign priority and time to some conditionally approved proposals. Details are available online.

JSA Postdoctoral Research Prize Nominations Due Today
JSA Postdoctoral Research Prize winners have a record of accomplishment in physics, promise of further accomplishments in the JLab research fields and an excellent proposal for use of the prize's research grant. All nominees must be within five years of graduation and in a postdoc or equivalent position at the time of nomination. For more information, see the announcement. The prize is funded through the JSA Initiatives Fund.

Accelerator

Last Tuesday was a beam studies day with injector optimization and testing; it ended with a spin dance for the halls to set the Wein angle. On Wednesday, all areas were taken to controlled access for radiation surveys at 2 p.m. The halls remained in controlled access, while the rest of the main machine was brought back to power permit to allow the radiofrequency and magnets to be turned back on and left in hot standby mode. Reduced staffing on Thursday kept everything warm and stable until Friday morning at 8 a.m., when all areas were brought to beam permit, and beam was sent back into Halls A and C within an hour. There were issues with a CAMAC crate controller and instabilities with phase and energy control in the South Linac, along with instability in the first-pass separator over the weekend. Beam was magnetically extracted into Hall A, with Hall C performing no-beam pedestal runs until the separator amplifier was replaced Monday morning.

Free-Electron Laser

The FEL team used the short week for machine maintenance.

Center for Theoretical and Computational Physics

Researchers at JLab, DESY in Germany and KEK in Japan have calculated the "bump" in the cross section associated with the ρ-meson resonance. Using the methods recently developed in <arXiv:1011.5288>, it is becoming more feasible to calculate the strong decays of hadrons directly from the fundamental theory of QCD using lattice methods. It is expected that these techniques will also work for baryons, such as the Δ resonance, allowing for theoretically clean calculations of properties of unstable hadrons.

Facilities Management and Logistics

Planning is underway for a power outage affecting all JLab campus buildings outside the accelerator site, excluding the VARC and ARC, for work on the campus electrical distribution system. The outage is currently scheduled to last for nearly the entire holiday shutdown period, beginning at 5 p.m. on Dec. 23 and ending at 6 p.m. on Jan. 2. There will be no power in these buildings during this period. More details will be announced as plans are finalized. If you have any immediate questions, contact Rusty Sprouse in FM&L, x7589.

JLab Calendar of Events

Dec. 6: Safety Shoe Vendor onsite
Dec. 6: Mobile mammography unit onsite
Dec. 10: Toys for Tots Toy Drive concludes
Dec. 11: JAG Children's Winter Wonderland Party
Dec. 20: Safety Shoe Vendor onsite
Dec. 22: Personal Dosimeter Change Out
Dec. 24-Jan. 2: Winter holidays/Shutdown days - JLab closed

 

 

 

Environment, Health, Safety and Quality

Free Reusable Solvents Available on Webstock
The solvents that are available are acetone, methanol and isopropanol. Originally, these electronics-grade solvents were used primarily for the cleaning of high-vacuum parts. They are still suitable for most general-cleaning tasks that would involve the use of the particular solvent. These solvents are intended for JLab use only. To order the solvents, log in to Webstock, select JLab Onsite Technical Stockroom and then select Jefferson Lab Freestock. The reusable solvents are listed under 97 REUSEABLE CHEMICALS-SAFETY. For questions regarding the safe and proper use of these chemicals, contact Brett Lewis at x6254 or Jennifer Williams at x7882.

Announcements

Wi-Fi Access Policy for JLab Business Flyers
With the advent of airplane Wi-Fi, the JLab policy on reimbursement of communications costs is being revised. While on business travel, airplane Wi-Fi may be reimbursed on expense reports for flights lasting longer than two hours. Additionally, if Wi-Fi is not provided at no extra charge in hotels, the cost for Wi-Fi service, which typically includes long distance phone service, may also be reimbursed on the expense report. If such Wi-Fi costs are reimbursed, they will be in lieu of personal and/or business phone calls placed from the room.  

Discounts on airplane Wi-Fi is available from GogoInflight.com, when purchased before the flight. Currently, the special lets you buy a pass good for Wi-Fi on multiple flights in a 24-hour period for $11, a $1.95 savings over the regular price. GoGo provides service on AirTran, Delta, American, US Airways and United. For the holidays, you can get free Wi-Fi on all AirTran and Delta flights through Jan. 2. If you know of other in-flight Wi-Fi service providers, contact Carol Kinsey.


Sentara Mobile Mammography Unit Onsite Dec. 6
Several appointment slots are open for the Sentara Mobile Mammography Unit that will be at JLab on Monday, Dec. 6, 9 a.m.-3 p.m., in the ARC parking lot. This service is open to all employees, family members and friends, since personal health insurances will be billed. The procedure takes 15 minutes. To make an appointment, call 1-800-SENTARA (736-8272) or see the Screenings and Events section on the Sentara website.

Personal Dosimeter Change Out Will Be Dec. 22
JLab's semi-annual personal dosimeter change out will take place during the afternoon of Wednesday, Dec. 22. This includes the dosimeters of all JLab staff, users and subcontractors. If you will need to use your dosimeter during the change out period on Dec. 22, you may exchange it that morning in the Radiation Control Dosimetry Office in Bldg. 52B, Room 4, 8 a.m. - 1 p.m.  If you have questions, contact Becky Mosbrucker, x7236.

JAG Offers JLab Merchandise Through Online Store
The Jefferson Activities Group provides the lab community with the opportunity to purchase a variety of merchandise with the JLab logo on it – directly from the JAG webpage.

Holiday Hideaway at the SURA Residence Facility
Rooms are available to JLab users, staff and family members every day, even during the Holiday Shutdown. For reservations, visit the website or call 757-223-1167.

JLab Children Invited to Winter Wonderland Party
The Jefferson Activities Group is hosting a children's Winter Wonderland Holiday Party on Saturday, Dec. 11, 10 a.m. -1 p.m., in the CEBAF Center lobby. All children of JLab employees, contractors and users are invited. Kids may share their Christmas lists and be photographed with Santa, play games and make crafts. Light snacks and drinks will be provided. All children must be accompanied by an adult. Each family is asked to bring a new, unopened toy donation for the Toys For Tots toy drive.
 
Volunteers Needed to Help With Children’s Party
A number of volunteers are needed to help with the children's holiday party, mostly as crafts-table and game helpers. Volunteers are needed to assist younger children with basic cutting, gluing or tying. Volunteers are also needed for the snack area and as Santa's Helpers. Sign up will soon be available online.
 
Toys For Tots Toy Drive Dec. 1-10
JLab is participating in the U.S. Marine Corps' annual Toys For Tots toy drive. Bring in your donation of new, unopened toys for children ages 1-12 and deposit them in the collection boxes. Marked drop boxes will be located near the main entrances of CEBAF Center, VARC, ARC, Test Lab and the MCC from Wednesday, Dec. 1 through Friday, Dec. 10.
 
Holiday Decoration Contest
Unleash your inner decorator in the Holiday Office Door/Cubicle Decorating Contest. To enter, e-mail Bridget Paul by COB, Dec. 15. Include your name(s), building number and office/cube location. Judging will take place Dec. 17.