Jefferson Lab Weekly Briefs October 29, 2015
Jefferson Lab Weekly Briefs
October 29, 2015
12 GeV Upgrade
The 12 GeV Upgrade project in Hall C includes an improvement to the scattering chamber vacuum window seal. This is expected to eliminate the radiation damage to the O-ring that has been experienced in the past. The windows and frames for this improvement have been fabricated and successfully mated to the scattering chamber.
Force-restraining collars have been installed around the Q3 coil assembly by the magnet vendor in France. All three magnets (Dipole, Q2, and Q3) have now been collared and are at the factory where the metal cryostat components are being manufactured. The Q2 coil is in its helium vessel and has been pressure tested. Leak-checking of this vacuum vessel revealed a small leak, which will soon be repaired. The vendor continues work to resolve tolerance issues with the thermal shield components of all the cryostats. Some have been reshaped and are now within tolerance, while others are being re-manufactured. As a result, deliveries of the magnets to Jefferson Lab have been delayed.
The horizontal bend magnet (HB) was tested to 50 percent of its design current. Data from this test supports the engineering analysis conclusion that forces due to eddy currents will not prevent safe operation at full field. Approval to operate it at this current is pending an external review of the analysis and modifications to the magnet power supply. The Q1 and HB magnets have been simultaneously energized to low current in a successful test of the magnet control systems.
Jefferson Lab Published Journal Articles, Oct. 19-23
Remember to submit your papers for approval to the Jefferson Lab Publications database.
Center for Theoretical and Computational Physics
A new paper by Jefferson Lab's Joint Physics Analysis Center presents a unitary multichannel model for antikaon-nucleon scattering in the resonance region, with amplitudes that have the correct analytical properties in the complex-energy plane and the right threshold behavior. The parameters of the model are determined by fitting single-energy partial waves up to J=7/2 and center of mass energy up to 2.15 GeV. This study provides the most comprehensive picture of the strangeness = -1 hyperon spectrum to date.
Facilities Management and Logistics
Reduction of 900 Plastic Bottles and Counting...
Five additional units have been purchased, and units are now installed in: the Support Service Center (Bldg. 28), the Free-Electron Laser (Bldg. 12), the North and South Access Buildings (Bldgs. 67 and 38), and the General Purpose Building (Bldg. 36). For more information about the stations, contact Bob Sperlazza, x6241.
Jefferson Lab Calendar of Events
Oct. 29: JAG Tailgate
Environment, Safety, Health & Quality
Orange Fencing Sprouts Up Around the Campus
Notice for GERT and Rad Workers: Radiation Area Posting Change
Tailgate Event Rescheduled for Oct. 29
Last Chance to Participate: Jefferson Lab United Way Campaign Ends Nov. 2
During the Tailgate, the winning tickets will be drawn for the lab's United Way fundraising campaign raffle. Tickets are $1 each and are available for purchase from noon-1 p.m. through Thursday in the CEBAF Center lobby. Tickets will also be available for purchase at the Tailgate. Winning tickets will be drawn for an Apple Watch, Apple iPad Mini, and a Fitbit! You need not be present to win.
Last Chance to Send in Your Information for Veterans Day Salute!
Whole Foods to Open at Tech Center
Inventors & Entrepreneurs: Sign up Now for START! Peninsula 4.0 Event Nov. 13-15
|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.|