Jefferson Lab Weekly Briefs
September 30, 2015
12 GeV Upgrade
The vacuum jackets are being welded into place on the hex beams connecting the six coils of the Torus magnet for CLAS12 in Hall B. Next steps include adding the cold to warm supports, routing instrumentation wiring, and adding the jumpers between pairs of beams, followed by transferring the weight of the magnet to the main support legs and removal of the assembly spit, which has been used to rotate the six sectors individually to positions where assembly can be done. The work at FNAL to wind and pot the coils and at Jefferson Lab to place the coils into cryostats has concluded, ending these major steps in Torus magnet construction. The vendor contracted to build the distribution can for the cryogenics for both the Torus and Solenoid plans delivery in November. The fabrication of the cryogenics control can, which will serve as the Torus Service Tower, is in its final assembly stage. Fabrication of the instrumentation chassis and racks, together with the cable harnesses and needed firmware, is progressing. The vendor for the Solenoid magnet for CLAS12 has begun winding the first of the two “Intermediate” coils. The winding bobbin for the fifth, or “Shield,” coil is ordered.
Jefferson Lab Published Journal Articles, Sept. 14-18
Remember to submit your papers for approval to the Jefferson Lab Publications database.
Center for Theoretical and Computational Physics
Calculations of two-nucleon interactions in lattice QCD are significantly more challenging than two-meson calculations. The Hadron Spectrum Collaboration has presented for the first time rigorous calculations of two-nucleon P-, D- and F-wave scattering, using unique spatial sources designed to couple to higher partial wave states. This work represents a proof of principle demonstration of the technology needed to understand more involved calculations of three and more nucleons, as well as two-nucleon matrix elements needed for understanding experimental probes of the Standard Model and searches for physics beyond.
As we get closer to fall beam operations, the Electrical Engineering Group is nearing completion on a number of projects, as well as performing hot checkout (HCO) on all accelerator systems. The Safety Systems Group is currently in the midst of Personnel Safety System (PSS) certifications. This is a two-week-long process, is worked on swing shift, and checks the accelerator and system components for readiness. The DC Power group have installed all but one of the new 'Dogleg' power supplies. These upgraded units, designed and built entirely at Jefferson Lab, provide the increased current to the pathlength adjustment magnets required for the higher beam energy of 12 GeV. The RF group are currently testing the new separator cavities, which will allow the beam to be used for multi-hall operations moving forward. The Instrumentation and Controls group is continuing maintenance and checkout of CEBAF systems, as well as working to get the LERF (formerly FEL) systems operational. As always, our Support Services group is providing fab shop and electrician support where needed around site as well as working in Hall B.
Jefferson Lab Calendar of Events
Sept. 28-Oct. 2: International Workshop on Beam Cooling and Related Topics
Environment, Health, Safety and Quality
The Safety Warden walk-thru program brings a fresh set of eyes to the work environment to search for such issues. Too often, people who work in the area or are doing a job unconsciously accept unsafe workplace changes or accept unsafe conditions they see every day. This is sometimes called “normalization of deviations.” By taking corrective action immediately, we do not let this deviation become part of the work environment.
Flu Vaccines Offered by Appointment
Red Cross Blood Drive Scheduled for Tuesday, Oct. 16
Tornado Warning Siren Test Set for Friday, Oct. 2
Reminder: All-Hands Meeting on Oct. 1
Vacation Donation Program Open Enrollment Ends Friday
Jefferson Lab to Kick off 2015 United Way Campaign with Picnic on Oct. 2
Radworker I and Radworker II Classes Offered in October
|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.|