Jefferson Lab Weekly Briefs October 6, 2016
Jefferson Lab Weekly Briefs
October 6, 2016
12 GeV Upgrade
The 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 & Logistics
Data Center Work to Impact CEBAF Center F-Wing Access on Saturday, Oct. 8
Jefferson Lab Calendar of Events
Oct. 5-7: JLEIC Collaboration Meeting
Environment, Safety, Health and Quality
Resolving ES&H Concerns
The DOE DPO process ensures that all JSA employees and contractor employees have the right to report environment, safety, and health technical concerns that have not been resolved through routine work processes.
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 Infrastructure
CNI Group Works to Integrate macOS Sierra (10.12) into CUE
Save the Date: Say Cheese for the First All-Staff Photo in Two Decades!
Flatbed Trailer for Use by LCLS-II Only
Come Out and Enjoy JAG Oktoberfest!
Volunteers Critical to Oktoberfest Success
Red Cross Blood Drive Scheduled for Thursday, Oct. 13
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.|