Jefferson Lab Weekly Briefs
October 6, 2016
12 GeV UpgradeThe Torus magnet for CLAS12 has been cooled down to 5 Kelvin in the coils. Tuning of the cryogenic circuits is ongoing to establish stable helium levels in the magnets, and final interlock checkout is underway. Once this is complete, then the first tests with current are planned, starting with up to 10 percent of the design current to check that the magnet is indeed superconducting and the field is as expected. Further tests will then ramp to successively higher currents, followed by a map at full current of the field near the hub in each of the six sectors.
The two splices connecting the first and third, and the second and fourth, of the four “Field” coils of the CLAS12 Solenoid have been made and then clamped in place with G-10 and thermally anchored using copper cooling blocks to the coil thermal mass to insure the splices themselves are superconducting. The helium piping, including supply, return and quench piping, is now being welded in place. This is the last step in fabricating the bobbin carrying the four field coils of the Solenoid. The fifth, or “Shield”, coil for the Solenoid is complete and has the preparatory work needed to splice it to the first four coils also complete. The Shield coil is suspended in the specialized tooling used to mate it with the first four coils for the Solenoid. In this next, major step, the five coils are joined into one assembly by suspending the bobbin with the four Inner and Intermediate coils inside of the bobbin for the Shield coil. This “cold mass” assembly is then covered with a radiation screen and multi-layer insulation before being placed inside the cryostat for the Solenoid. Planning for shipping the Solenoid to Jefferson Lab is now underway, including the design of the shipping cradle and isolation springs needed for the road trip to Virginia.
Hall C is waiting for the Q2 magnet to arrive. Once the magnet has arrived, it will be uncrated and loaded on a low-boy trailer for transport to Jefferson Lab. The magnet will be placed on the Super High Momentum Spectrometer platform, where it will undergo acceptance testing, final installation and commissioning.
Facilities Management & LogisticsData Center Work to Impact CEBAF Center F-Wing Access on Saturday, Oct. 8
The Computer Center 10-Year Plan portion of the Utilities Infrastructure Modernization Project will be installing foam insulation in the Data Center on Saturday, Oct. 8. CEBAF Center occupants may notice a musty odor on the first floor near this work. A portion of the CEBAF Center 1st floor F-Wing hallway will be temporarily closed due to subcontractor insulation and air hoses impeding the walkway. Hoses will be routed from inside the Data Center to the exterior through F111 (see map). The CEBAF Center F-Wing K stairwell will also be affected, and it will be open for use for the second and third floors only. Additionally, the contractor will have a work truck set up in the loading dock driveway. Due to the extensive area that this work will affect, Facilities Management & Logistics recommends that lab staff and users plan to avoid this area on Saturday and plan instead to use the CEBAF Center FWing L stairwell entrance for access to the F-wing. For questions or concerns about this work, contact Michele Solaroli at email@example.com or x7751.
Jefferson Lab Calendar of EventsOct. 5-7: JLEIC Collaboration Meeting
Oct. 13: American Red Cross Blood Drive
Oct. 17: Safety Shoe Truck on-site
Oct. 17-19: Physics of Photocathodes for Photoinjectors (P3) Workshop
Oct. 24: Jefferson Lab All-Staff Photo
Oct. 27: JAG Oktoberfest
Nov. 24-25: Thanksgiving holiday, Jefferson Lab closed
Environment, Safety, Health and Quality
Resolving ES&H Concerns
Once your concern has been addressed, communicate any lessons learned to your staff, co-workers, supervisors and your Division Lessons Learned Coordinator. ES&H Manual Chapter 2310 offers more information on concern resolution.
Computing and Networking InfrastructureCNI Group Works to Integrate macOS Sierra (10.12) into CUE
The latest version of the macOS, Sierra (10.12), was released on Tuesday, Sept. 20. Starting today, Sierra will be available to customers as an automatic download via the App Store. The IT Division is currently working to integrate Sierra into the Common User Environment for Jefferson Lab-owned Macs. If you're currently using a Jefferson Lab-owned Mac, please do not install Sierra until further notice. Once the IT Division has integrated Sierra into the CUE, an announcement of support will be made, and you can then install Sierra on your Jefferson Lab-owned Mac. If you have any questions or concerns about this announcement, contact the IT Division Helpdesk at x7155 or firstname.lastname@example.org.
Save the Date: Say Cheese for the First All-Staff Photo in Two Decades!
Tornado Warning Siren Test Set for 10:30 a.m. on Friday, Oct. 7
|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.|