Jefferson Lab Weekly Briefs
April 14, 2010

12 GeV Upgrade

The first four of 48 Barrel Calorimeter (BCAL) modules for Hall D have been machined, given final quality assurance checks and readied for shipping to JLab by the team at the University of Regina in Saskatchewan, Canada. The fifth and sixth modules have been built and sent for final machining, and the seventh and eighth are being built. A contract for construction of the Hall D Forward Calorimeter has been awarded to Indiana University. This calorimeter consists of some 3,000 lead-glass blocks that are read out by FEU-84 photomultiplier tubes via new Cockcroft-Walton type high-voltage synthesizer-and-divider bases designed at Indiana University. A contract for fabrication of the Hall D Central Drift Chamber has been awarded to Carnegie Mellon University. This chamber consists of 28 cylindrical layers of straw tubes arranged in groups of radial and axial straws, held between two large precision endplates which were recently received from the vendor and checked at JLab prior to shipment to CMU.

Physics

Application Deadline Nears for Scholarships and Fellowships
DOE is offering nuclear science and engineering scholarships and fellowships as part of its efforts to recruit and train the next generation of nuclear scientists and engineers. Applications are due by April 26. The Nuclear Energy University Programs (NEUP) will provide approximately $5 million for scholarships and fellowships for students enrolled in two-year, four-year and graduate engineering and science programs related to nuclear energy. Undergraduate scholarships will average $5,000 per year, and the maximum award for fellowships will be $50,000 per year.

Accelerator

The accelerator was running well, with low trip rates. Operations personnel were only delivering beam to Hall B last week. Hall A had been down due to target and vacuum-related issues.

Free-Electron Laser

The FEL team continued to set up the machine last week and was making good progress toward lasing. By the end of the week, the team had energy-recovered beam with continuous-wave operation and were optimizing the match for lasing.

Theory Center

A new paper <arXiv:1004.1949 [hep-ph]> shows that at large photon virtuality Q2, the coupling to the vector meson production channels provides a natural explanation of the surprisingly large cross section of the neutral pion electroproduction recently measured at JLab, without destroying the good agreement between the Regge pole model and the data at the real photon point. Elastic rescattering of the π0 provides theorists a way to explain why the node that appears at t ~ 0.5 GeV2 at the real photon point disappears as soon as Q2 differs from zero.

Facilities Management and Logistics

Construction is underway adjacent to Building 102 (End Station Refrigerator Building) on a new building to house a 4 kilowatt cold box that will increase the lab's cryogenics capability. Currently, an existing potable waterline is being relocated to allow construction of a concrete pit to house a 4 kW refrigerator. Construction has closed the use of the sidewalk between CEBAF Boulevard and the Counting House. Sidewalk Detour: Please walk along the West Arc section of the accelerator footprint road and cross CEBAF Boulevard to access the pedestrian sidewalk that runs along the north side of CEBAF Boulevard. This sidewalk will remain closed until October, when the project is scheduled for completion. Facilities Management and Logistics apologizes for any inconvenience.

JLab's Safety Numbers

29 Days since Last Recordable Accident (JLab record: 331)
29 Days since Last Lost Workday Accident (JLab record: 676)

JLab Calendar of Events

April 14-15: AVS Mid-Atlantic chapter meeting and short course
April 21: JLab Teachers Science Night
April 28: Colloquium and Public Lecture
April 29: Safety Shoe Vendor onsite
May 1: Jefferson Lab Open House
May 5: Colloquium and Public Lecture
May 12: JLab's 25th Annual Run-A-Round

 

 

 

Environment, Safety, Health & Quality

Having an emergency exit does little good if you can't get through it. For exits to be useful, people must be able to find and navigate through them. Fire codes govern the placement and design of exits for the safety of building occupants. Recent safety inspections at JLab found some emergency exits or pathways to emergency exits that were obstructed. It is part of everyone's job to make sure that exit signs, lights and pathways are working, unobstructed and up-to-date.

Exit signs: The purpose of exit signs is to guide people to the best exit pathway in the event of fire or other emergency. You have probably seen them posted at exit doors and along paths of travel. Exit signs can fall short, because they are not sufficiently apparent (due to placement or number), they are misleading, or, in the case of illuminated signs, because they are not lit.

Exit lights: These help to identify exit pathways as well as afford visibility under low-light conditions. Common problems are misdirected, broken or limited lighting.

If you find an exit pathway blocked, clear it! If it is a consistent problem, contact your supervisor and Safety Warden. Also, contact your area Safety Warden to report faulty or questionable exit lights and signs. A list of area safety wardens can be found online.

Announcements

JSA Research Assistantship Offered
JLab is seeking SURA university student candidates for a research assistantship. The position provides an opportunity for a minority undergraduate student to work on projects that are part of the lab’s research program or directly related to the scientific or engineering aspects of the research program. This assistantship is funded by the JSA Initiatives Fund Program and will provide funds to support the student at the university during the 2010-2011 academic year. Nominations must be submitted by the faculty sponsor before the student may apply. Faculty sponsors may obtain more information and submit their nomination online.

Lunch Seminar: Driving Ahead in Challenging Times
Learn how to survive these difficult economic times. This seminar focuses on maintaining personal effectiveness amid current challenges. Bring your own brown bag or cafeteria lunch to CEBAF Center room F113, noon-1 p.m. on Tuesday, April 20. To reserve your space, call DeLisa Stanfield at x6999 or Bruce Ullman at x7170. Reserve your space soon, limited seats are available. This seminar will be facilitated by Optima's Employee Assistance Program.

Open House Countdown
Jefferson Lab's Open House 2010 is fast approaching. On Saturday, May 1, join fellow scientists, administrators and technicians as we open up lab facilities for tours and help educate the public about JLab science. Local universities, regional museums and government agencies will also present activities and information on local science endeavors. This is a National Lab Day event.

JLab Campus Construction Update Online
To keep up with the latest construction activity at JLab, and to learn how it might impact you and your co-workers, the Construction Corner portlet has been added to the front page of Insight. Each Monday, an updated list of construction projects will be posted to the Construction Corner. A site map also will help you identify and locate the various projects. You can find Construction Corner in the upper-right-hand corner of the Insight page.

Volunteer for a Project for National Lab Day!
Local educators are looking for scientists and engineers willing to ride rollercoasters for amusement park physics, assist learners to calculate the basics of load distribution and assist students with Lab View for a wind tunnel project. Volunteer for these and other great projects at the National Lab Day website.

Free Seminar on Vacuum
Varian, Inc., will conduct a free seminar titled "Fundamentals of Ultra-High Vacuum," on April 28, 9 a.m.-3 p.m. in ARC 231-3. Lunch will be provided. To register, e-mail DeLisa Stanfield.