Jefferson Lab Weekly Briefs February 15, 2012

Jefferson Lab Weekly Briefs
February 15, 2012


Hall A is in the final stages of preparing for the g2p experiment, which will hopefully begin in two weeks. The polarized proton target is being cooled down (thanks to the work done by the target group). The HARP scanners have been refurbished and are being installed. The beam position monitor hardware is complete, but is awaiting the firmware and EPICS control. A local dump is being prepared and will be installed. The septum magnets will have shims to increase the magnetic field. The installations continue this week and into next week. Following a final alignment, the hall will be ready for beam.

In Hall C, Q-weak continued production data taking on hydrogen until problems in the dump developed. When beam is resumed, Q-weak plans several days of asymmetry measurements with a transversely polarized beam.

JSA/JLab Graduate Fellowship Program
JSA, LLC, is now accepting applications for the 2012-2013 JSA/JLab Graduate Fellowship Program. More information and an application can be found on the JSA, LLC website. The application deadline is March 9.

JSA/JLab Sabbatical Support Program
JSA is now accepting applications for the 2012-2013 academic year JSA/JLab Sabbatical Support Program. More information and an application can be found on the JSA, LLC website. The application deadline is March 9.


The Injector group associated with the PEPPo experiment reported initial success in setting up the beamline and getting beam transported most of the way down it. Halls B and C received great beam delivery all week and through the weekend until Hall C experienced a problem with a beam dump detector system. The new radiofrequency modules in the South Linac, SL24 and SL25, were brought online and provided RF power to the beam without major interruptions. This is a major accomplishment for JLab!

Free-Electron Laser

This week, a leak on one of the RF windows on FEL03 was successfully mitigated by the installation of a second window and buffer vacuum. A new gun cathode was prepared, installed on the load-lock and baked. The Darklight collaboration installed a sealed sodium iodide detector in the FEL vault after calibrating it in Lab 1. The detector is for a study of background radiation levels. On Friday, the group executed a major cleanup of building 18, preparing space for future new projects.

Center for Theoretical and Computational Physics

The structure functions f(x), g1(x), and g2(x), measured in deep inelastic scattering, were recently calculated using a constituent quark model of the nucleon based on the covariant spectator theory. The model assumes the nucleon can be described by a covariant three-quark wave function which is a superposition of S, P and D-state components. Both the shape of the wave function and the relative strength of each angular momentum component are determined by fitting the experimental DIS structure functions, and it is found that a model with a large D-state component (35 percent) can explain all of the proton and neutron data. The work suggests that the famous proton spin puzzle might be replaced by another puzzle: What is the dynamical origin of this large D-state component?


The alignment group has been very busy. Recently, it has completed a Hall D photon dump berm elevation survey, continued to fiducialize and align the g2p components as they become available and fiducialized cryomodule C100-4. In addition, the group has located new horizontal and vertical monuments in between the Tagger area and Hall D; these will be used for rapid connection surveys between the main accelerator and Hall D as there is no direct line of sight available. In magnet measurement, work continued to measure the dipoles for the 12 GeV spreader/recombiner magnets. These consist of some difficult magnets with curved pole tips and more traditional dipoles with linear pole tips. The group also finished mapping the Moller Quads in place in Hall A.

Environment, Safety, Health and Quality

OSHA Releases Latest Occupational Hazard Numbers
According to the U.S. Occupational Safety & Health Administration, 4,547 workers died on the job in 2010, meaning that more than 12 people died every day on the job. Of the worker fatalities in private industry during this period, nearly one-fifth were in construction, with the leading causes of worker deaths on construction sites listed as falls, electrocution, struck by object and caught in or between objects. JLab continues to have large construction zones onsite. Always remain extra cautious around these areas, never enter these areas if you have not received the training necessary to access them, and follow the instructions of posted signage.


JLab's 2012 Benefits Open Enrollment Is Now Available
The Benefits Open Enrollment is offered via the Employee Self Service System (ESS) to all Regular and Term staff employees through Feb. 29. Visit the Human Resources Benefits page for a wealth of information on the 2012 benefits offerings for open enrollment, including comparison charts, summaries and full program descriptions. Important details about changes to medical benefits can be found here. Don't forget: You must access the ESS before Feb. 29 to select another medical option outside of the medical plan default; to make changes to your current benefit elections; to participate for the first time in a Medical Care or Dependent Care Flexible Spending Account Plan or to continue your enrollment in a Medical Care or Dependent Care Flexible Spending Account.

Feb. 15 Colloquium Canceled
The colloquium that was scheduled to take place today in the CEBAF Center auditorium at 4 p.m. today has been canceled.

Golf League Forming for Season
JLab golfers, and those who would like to be, are invited to join the JLab Golf League for the 2012 season. A meeting will be held in ARC room 231/233 on Wednesday, Feb. 22, at noon to discuss plans. Bring your own lunch to this informal meeting. Questions may be directed to Mike Zarecky, x7609. For more information, visit the JAG webpage.

New Bike Club Jersey in the Works
The JLab Bike Club, in coordination with the Jefferson Activities Group, is preparing to order new bike jerseys. Pre-order requests must be received by Feb. 19. The current estimated price is roughly $43 each for a unisex, short sleeve, club cut jersey with a hidden zipper and three stretch pockets. For more information, visit the JAG webpage.

Calling All Design Fashionistas!
The Jefferson Activities Group is seeking entries for the annual Jefferson Lab T-shirt design contest. The JAG will accept T-shirt design entries Feb. 15 - March 12. For more information, visit the JAG webpage.

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.

Congratulations this week go to Maurizio Ungaro, Paul E. Reimer, Annie Tran, DeAnn Maddox, Karen Bartek, Stephanie Vermeire, Doug Higinbotham, Michael Haddox-Schatz, Brita Hampton, Casey Heck, Samika Hawkins, who were the first to correctly identify the Feb. 8 location. Honorable mentions go to Michelle Shinn, Brian Carpenter, Kim Kindrew, Lori Zukerman, Dick Owen, Lawrence Ferbee, Tim Whitlatch, Dipangkar Dutta, Jason Willoughby, Huan Yao, Mark Ito, Stephen Wood, Ryan Bodenstein, James Maxwell, John Leckey, Anusha Liyanage, Dena Polyhronakis, Buddhini Waidyawansa, Rob Mahurin, Dan Moore, Anna Cornejo, Harry Fanning, David Jenkins, Tammy Frye and Elaine Zuchowicz. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.

JLab Calendar of Events

Feb. 27: Safety Shoe vendor onsite
Feb. 28: Advanced Materials Forum, CC auditorium
March 3: Virginia Regional Middle School Science Bowl
March 5-9: International ICFA Workshop on Future Light Sources