Latest Weekly Briefs

Wed, 2016-10-19 18:07

Jefferson Lab Weekly Briefs
October 19, 2016

12 GeV Upgrade

The tooling to install the Central Time of Flight for CLAS12 has been delivered. These are the final items of tooling and installation fixtures for the Central Time of Flight, or for any CLAS12 detector on the 12 GeV Project, for that matter; the order includes the installation arm and transport strong-back needed to install CTOF slats into the Solenoid magnet bore. A contract was awarded for the tungsten-based Moeller-electron shield, which is needed to shield the downstream detectors in CLAS12 from that source of background hits. On the installation front, the six Region 2 Drift Chamber sectors have been installed into the Torus magnet, a few weeks after the six Region 1 Drift Chamber sectors were installed into the Torus magnet. Work is proceeding to wire up the low-voltage and high-voltage supplies for these and to prepare the manifolds for the chamber gas. The Region 3 Drift Chambers will be installed once the Torus magnet is tested at high current and then field-mapped.


Library Offers Free Books
The library is purging its older titles and offering them to lab staff on a first-come, first-served basis. These books are located near the windows in the back of the library area - just look for the signs. The library will dispose of any unclaimed books on Nov. 1. The list of available books is linked here.

Center for Theoretical and Computational Physics

Quantum Chromodynamics describes the strong interactions of quarks and gluons as mediated by a fundamental charge called "color." While in Nature the number of color charges is three, many interesting insights can be obtained by considering a hypothetical world with a large number of color charges, in which the dynamics simplifies and baryons behave like heavy classical bodies. Recent work has applied this method to study the Generalized Parton Distributions measured in high-momentum meson production experiments at Jefferson Lab (π0 and η) and found the predictions to be in good agreement with the CLAS 6 GeV results.


The metrology group has been busy supporting many activities throughout the lab, including the following.

  • The skeleton network survey in the main accelerator was completed. This is necessary to track tunnel settlement/ movement, which assists Accelerator Operations with understanding beam path changes.
  • In Hall A, the revised Q1 quadruple magnets on both spectrometers were re-fiducialized and re-aligned to the spectrometers. Additional Hall A work consisted of aligning the Compton table, Deeply Virtual Compton Scattering experiment surveys, spectrometer pointing surveys and alignment of the GEp target.
  • All six of Hall B's Region 1 Drift Chambers between the cryostats of the torus were aligned, as were two of the six Region 2 Drift Chambers. Also in Hall B, the mapper plates were installed and aligned to less than 0.1 millimeter of design.
  • The big news in Hall C was the delivery of Q2 for the Super High Momentum Spectrometer. The group had to work rapidly to fiducialize the magnet prior to installation on the yoke in SHMS. The Hall C target was also aligned.
  • In Hall D, the tagger microscope, hodoscopes and collimator were fiducialized. The goniometer was also aligned.
  • For LCLS-II, the vacuum vessel, cavity string, cold mass supports and assembly floor rails were all either aligned or measured.
  • Finally, magnet measurement started the commissioning of the Hall B Torus mapper. The group verified the mechanical and software systems by sampling data on the Torus magnet at 10 percent of full power. The tests were successful.

Facilities Management and Logistics

Hogan Drive: Expansion Work to Begin Week of Oct. 24
Beginning the week of Oct. 24, the process will start to change the two-lane Hogan Drive into four lanes. The process is scheduled to take 8-9 months. The first phase will be to construct two new lanes on the Jefferson Lab side of Hogan. The existing road will remain open during this work. The next phase will transfer all traffic to the new road, in order to construct the other two new lanes and the landscaped medium. Traffic signs will be posted.

During much of this process, the Jefferson Lab Hofstadter Road entrance off Hogan will be closed. Incoming traffic to the Support Service Center, Bldg. 28, can enter either at Lawrence Drive off Hogan or down Rattley Road. Traffic exiting the lab will need to leave through the Rattley/Hogan entrance or the Lawrence/Jefferson Ave. entrance. If you have any questions about this work, contact Bob Sperlazza at x6241 or

Jefferson Lab Calendar of Events

Oct. 24: Jefferson Lab All-Staff Photo
Oct. 27: JAG Oktoberfest
Oct. 28: Colloquium: Gravitational Waves and Black Holes
Nov. 16-17: Excited Hyperons in QCD Thermodynamics at Freeze-Out (YSTAR Workshop)
Nov. 24-25: Thanksgiving holiday - Jefferson Lab closed
Dec. 10: JAG Children's Holiday Party
Dec. 23-Oct. 2: Winter holidays and Shutdown days - Jefferson Lab closed

Environment, Safety, Health and Quality

Battery Recycling and Disposal
Recycling is the best option for disposing of used and dead batteries. In some cases, it is illegal to throw certain types of batteries into residential trash (e.g. car batteries). Some batteries, particularly the rechargeable types, are relatively easy and free to recycle. The City of Newport News offers a listing of local vendor options.
Unfortunately, it is not as easy to recycle alkaline batteries. These have little material value compared to the cost of transportation, labor and equipment necessary for recycling them. The Virginia Department of Environmental Quality states that it is acceptable to dispose of alkaline batteries in the residential trash. In the past, this was a concern; however, in the U.S., these batteries now contain little or no mercury, thanks to the Mercury-Containing and Rechargeable Battery Management Act of 1996.
Jefferson Lab has a battery recycling program that is simple and easy to use. Batteries of any type, purchased and used for laboratory operations, may be deposited in the "blue tubes," strategically located around the site (usually near a building’s mail distribution area). Some areas also have a small drum for sealed lead acid batteries. These tubes and drums are not for personal use. Please do not bring batteries from home. It is illegal for Jefferson Lab to dispose of personal use batteries. Anyone who sees a full container or other problem, or needs assistance with large rechargeable batteries (such batteries used in laptops, cordless drills, etc.), should use the contact information on the container. A lab employee will provide assistance with collection, sorting and preparing the batteries for shipment.


Say Cheese for the First All-Staff Photo in Two Decades!
On Monday, Oct. 24, Jefferson Lab Public Affairs is planning to capture the first photo to be taken since 1996 of all staff members. All full-time, casual, jointly appointed and student employees of Jefferson Science Associates, LLC, are invited to participate. Come early for the 9:30 a.m. portrait to be taken on the brick walkway in front of the Technology and Engineering Development Building (Bldg. 55). The photographers suggest that participants wear solid-colored shirts, dresses or suit jackets. If you have any questions or concerns about the event, contact Kandice Carter at or x7263.

TIAA-CREF Offers Financial Literacy Resources
Several recent surveys have found that nearly a third of Americans have no retirement savings at all or are not taking advantage of the full suite of resources available. With more uncertainty in the economy than ever before, being part of the conversation about saving for your future has never been more important! In an effort to continue financial literacy education among Jefferson Lab staff, Human Resources is highlighting National Retirement Security Week. To discover the ways that TIAA-CREF can assist you in your goals for the future, visit the website. If you have any questions about enrollment in the lab-sponsored retirement plan, contact Treva Ferguson at x7291.

Volunteers Needed to Make Oktoberfest a Success!
Prime volunteer positions are still available for a variety of activities, ranging from tent set-up, to replenishing food, to distributing ID bracelets. Volunteer participation is critical to the Oktoberfest's success, and staff and Users may volunteer for one hour and party the other two! If you haven't picked your slot yet, sign up today.

Jefferson Lab Public Address System Test Set for Thursday, Oct. 20, at 5:30 p.m.
Emergency Management Team staff will conduct the monthly test of Jefferson Lab’s Public Address System – the live audible announcement feature – available through the lab’s Cisco phones. The test is conducted after normal business hours, because it interrupts any in-progress call on a Cisco phone. Active calls are automatically put on “hold.” As soon as the announcement has ended, the Jefferson Lab person may re-activate the call. For more information, see the full memo.

Tickets Still Available for Raffle Benefitting the United Way
You can win a GoPro HERO4, a Samsung Galaxy Tab S2 (32GB), or a $300 Best Buy Gift Card! Purchase your raffle tickets for $1 each in the CEBAF Center atrium during lunch time throughout the month of October. Tickets will also be sold at the JAG Oktoberfest on Oct. 27 until the winning tickets are drawn. All proceeds will go to the United Way of the Virginia Peninsula.

United Way Pledge Campaign Continues Through Nov. 7
Jefferson Lab's annual pledge campaign for the United Way of the Virginia Peninsula is underway. Every contribution to the United Way, no matter the sum, provides an array of critical services and supplies to those in need within our community. After-school programs, affordable daycare, transportation for the elderly, hospice care, job training for the less fortunate and even food and shelter are just some of the benefits that result from your donations. Download the pledge form or pick up a physical form at the front desks of the SSC, TED, MCC and CEBAF Center. All forms should be returned to Krystina Serafini, Mail Stop 12B, CEBAF Center Room B214 by Monday, Nov. 7.

Colloquium: Gravitational Waves and Black Holes
If you’ve heard about the recent detection of gravitational waves and wonder what the kerfuffle is about, come hear Vernon Sandberg, Caltech, explain how our understanding of dynamical gravity changed from theoretical to experimentally confirmed in the early hours of Sept. 14, 2015. Sandberg is a Lead Scientist at the Laser Interferometer Gravitational-Wave Observatory (LIGO) Hanford Observatory in Washington. In this colloquium, he will discuss the LIGO project, the physics behind its interferometers, and the first direct detection of gravitational-wave events. The talk is scheduled for 11 a.m. on Oct. 28 in the CEBAF Center auditorium.

Veterans Day Collage Needs Your Submissions
In recognition of Veterans Day, veterans of military service are invited to participate in a collage to be displayed in CEBAF Center on Veterans Day. This will be similar to the one displayed the past two years. If you submitted a photo in the past, no need to re-submit. For more information or to participate, contact Mike Robbins at or x7616. Submissions should be made by Oct. 31 and include a photo of yourself in uniform and your full name, branch of service and years of service. If you do not have a digital copy of your photo, employees can bring a picture to CEBAF Center room C222 to be scanned.

Come Out and Enjoy JAG Oktoberfest!
Jefferson Lab employees and users are invited to the Jefferson Lab Activities Group (JAG) Oktoberfest scheduled for Thursday, Oct. 27, 3-6 p.m. in the field behind the SURA Residence Facility. A variety of foods will be available, as well as games and activities, including a Bounce House and Pumpkin Toss. The United Way winning raffle tickets will be drawn at 4:30 p.m. For more information, see the JAG website.

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.