Jefferson Lab Weekly Briefs
August 20, 2014
12 GeV Upgrade
The last drift chamber for Hall B's CLAS12, one for Region 3, has had all wires strung, window added, feed-thru pins potted, and is being readied for testing. Three of the remaining 17 drift chamber sectors are having instrumentation completed, with the balance ready for installation. The production modules of the Silicon Vertex Tracker (SVT) barrel continue being assembled and tested at Fermilab, with over 30 now completed. The innermost modules of the SVT have been mounted onto the support frame/cooling plate in the clean room at Jefferson Lab and have been tested in place. The containment vessel for the High Threshold Cerenkov Counter (HTCC) has had the photomultiplier tube supports added and is being readied for mirror installation. All of the coated production mirror segments for the HTCC are being glued to form 12 half-sector mirrors. These will then be glued along their edges to form the full HTCC mirror. The aluminized Lexan strips that will be placed on the hyperbolic mirror segments of the Low Threshold Cerenkov Counter (LTCC) have arrived from the vendor and are being attached. A second full-size practice coil for the Torus magnet was wound, epoxy-potted and then sectioned to test the revised potting procedure. A good coating of all the coil elements was found. Pre-assembly of the Torus thermal shield is nearly complete at Jefferson Lab. The parts for the vacuum jackets have all arrived and are being welded as much as possible before the coil cold masses arrive from Fermilab. The vendor for the Solenoid magnet has wound 12 of the 26 layers of the practice coil.
Jefferson Lab Published Journal Articles, August 11-15
Remember to submit your papers for approval to the Jefferson Lab Publications database.
Center for Theoretical and Computational Physics
In a recent paper, the covariant spectator theory (CST) was used to compute the π-π scattering amplitude, which was shown to satisfy the Adler self consistency condition, as required by chiral symmetry. Novel features of this theory and calculation are that it is carried out in real space-time (Minkowski rather than Euclidean space), so that it can be easily extended to real scattering and so that the dynamics can include a confining interaction with a scalar component and still have the correct chiral limit. The calculation was a serious test of the CST, because the Adler zero can be obtained only when contributions from the kernel are calculated to all orders.
Facilities Management and Logistics
CEBAF Center A & C Wing Restrooms to Close Temporarily for Refurbishment
Phase I includes Wing A restrooms on the first and second floor.
Phase I work is set to begin on Monday, Aug. 11, and should be completed within four weeks. Phase II work is planned to begin immediately thereafter and should take about the same time. Notification will be made in advance of the start date for Phase II.
Notices will be placed on the restroom doors while they are closed. The notices will include locations of other restrooms. The anticipated project completion date for all phases is late September. Facilities Management appreciates your patience during this brief inconvenience, as we work to provide safe, sanitary and upgraded restrooms.
Environment, Safety, Health and Quality
To avoid such encounters, you should be looking for animals before moving equipment that has been in the grass or along a fence or when trimming bushes, moving logs, raking leaves, etc. The venomous critters of Hampton Roads include copperhead/cottonmouth snakes, black widow and brown recluse spiders and stinging insects. Additionally, fire ants can be a big nuisance this time of year.
Computing and Networking Infrastructure
Get Jefferson Lab Site-Wide Alert Pager Messages on Your Personal Cell Phone
In order to register your cell phone number in JList, send an email to firstname.lastname@example.org with email subject line "Add personal cell to SWA JList List." In the body of the email, provide your name, cell phone number including area code and the service carrier (Sprint, AT&T, Verizon, etc). Questions may be directed to email@example.com.
Cybersecurity: Protect Against USB Vulnerability
For more tips on safely using USBs, see these recommendations from the U.S. Computer Emergency Readiness Team.
Jefferson Lab Employee Tour Set for Thursday, Aug. 28
Engineering Seminar: The European Spallation Source and its Safety Protection Systems
Registration Underway for Sept. 12 United Way Day of Caring
Jefferson Lab Calendar of Events
|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.|