Jefferson Lab Weekly Briefs April 23, 2014
Jefferson Lab Weekly Briefs
April 23, 2014
12 GeV Upgrade
Hall C continues to install shielding and other components in the Super High Momentum Spectrometer detector, as well as cryogenic connections to the SHMS carriage. Installation and commissioning work continues in Hall D, with all five major detectors now installed. The Tagger area is being prepared to receive beam with energy greater than 10 GeV to meet 12 GeV Upgrade project milestones. The goal is to complete Hot Checkout to permit 5.5-pass, tune beam to this area before the summer accelerator shutdown in May.
JSA Sabbatical and Research Leave Support at Jefferson Lab
Records and Information Management Month Fact of the Week
RIM Trivia Question of the Week
Center for Theoretical and Computational Physics
The deuteron form factors and static deuteron moments are sensitive to the two-body interaction current of an isoscalar neutron-proton system, previously believed to be zero (except for possible exotic contributions unconstrained by the n-p interaction). However, recent precision fits to the n-p scattering data using the Covariant Spectator Theory required a new type of interaction that necessarily leads to large interaction currents directly related to the n-p interaction. In two new papers, these large currents have been uniquely determined and then used to predict the deuteron magnetic moment, which is found to be in good agreement with experiment.
The various groups in the Electrical Engineering Support department have directed their efforts toward completing installation and Hot Checkout of the accelerator systems required to transport beam through 5.5 passes in the linacs and on to the Hall D tagger dump. Significant work has gone toward final installation and testing of the box power supplies with the final PS needed for 5.5-pass running, achieving full power last week into a dummy load. All that remains is to commission the power supply into the magnet string in the tunnel. The Instrumentation & Controls group completed beamline instrumentation and controls installation in the 5C beam line all the way to the tagger dump. The dump cooling system was one of the last pieces requiring completion. The Safety Systems group has been working to complete and certify the enclosure interlocks that will allow equipment to be energized and beam transported to the dump. The Radiofrequency group has spent time bringing the new C100 South Linac RF zones up to 500 MV (100 MV per zone) operating gradients, as an ensemble, for a one-hour run, thus demonstrating the project performance goals. The North Linac RF C100 zones had previously demonstrated this performance.
All groups also have engaged in opportunistic maintenance and repairs during the downtime caused by the ground fault and vacuum breach when a ZA magnet failed in the northwest recombiner region. Magnet repair and a failure investigation is continuing nicely, with repairs expected to be completed later this week.
Finally, the entire Electrical Engineering Support department mourns the death of longtime colleague and friend Greg Arnold, who passed away unexpectedly April 9.
Facilities Management and Logistics
Jefferson Lab Parking Lots to Be Closed April 26-27 for Markings Painting
The subcontractor will provide traffic control to ensure the safety of its crews while also allowing traffic to continue to flow in and about the lab. Awareness of their presence as well as adhering to the traffic controls is required. See the full announcement for a linked pdf showing the scope of the project. All road traffic markings and highlighted parking areas are scheduled for re-painting. Thank you for your attention to this work.
Jefferson Lab Calendar of Events
May 7: JAG Annual Run-A-Round
Environment, Safety, Health and Quality
Carbon Monoxide Hazards from Small Gasoline Powered Engines
While these examples are from workplace situations, similar uses and even smaller enclosed spaces occur at home. Many people believe that just opening a door and window is adequate ventilation, but it may not be. Generally, large volumes of dilution air, unless there is a local exhaust system at the source, is needed to minimize concentrations of CO.
Computing and Networking Infrastructure
Phone Maintenance Scheduled for Tuesday, April 29
Take Our Daughters and Sons to Work Day is Thursday, April 24
A few laboratory rules to remember: Adults are responsible for their children while they are at the lab. Children are not permitted in work areas that are restricted or have limited access due to technical or safety considerations, such as Radiologically Controlled Areas (RCAs), construction sites, and any area where personal protective equipment (PPE) is required. Children are allowed escorted access on the Accelerator Site, as long as they stay out of the above-mentioned restricted areas. Children may not ride in lab golf carts. If you have any questions, contact your Division Safety Officer or ESH&Q liaison.
Document Shredding Truck to Visit Lab on April 28
Jefferson Science Associates Minority/Female Undergraduate Research Assistantship
Registration is Open for the May 7 JAG Run-A-Round
Help Make the Run-A-Round a Success
TIAA-CREF Individual Counseling Available by Appointment
Student Projects, Volunteer Mentors Needed for High School Interns
Tracking Thomas at Jefferson Lab
|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.|