Jefferson Lab Weekly Briefs July 5, 2017
Jefferson Lab Weekly Briefs
July 5, 2017
Jefferson Lab Published Journal Articles, June 25-July 1
Remember to submit your papers for approval to the Jefferson Lab Publications database.
History Archives Photo of the Week
Center for Theoretical and Computational Physics
The particle-exchange model of hadron interactions can be used to describe three-body scattering under the isobar assumption. A new study begins with the 3-to-3 scattering amplitude for spinless particles, which contains an isobar-spectator scattering amplitude. Using an ansatz for the latter, a relativistic scattering equation is then derived that manifestly fulfills three-body unitarity and two-body unitarity for the sub-amplitudes.
The Central Helium Liquefier 2 (CHL-2) C6 warm compressor testing is complete, with all technical specifications met. This completes this portion of the Utilities Infrastructure Modernization project.
The Cold Compressor Review in early June resulted in a recommendation to re-install the repaired Cold Compressor 5 (CC5) compressor into the SC1 2K coldbox, as well as the repaired Cold Compressor 4 (CC4) compressor, if it could be made available in a timely fashion to support fall operations. Components to finish the CC4 repair remain to be delivered from the supplier, so the Cryogenics group has moved forward by installing the repaired CC5 compressor, reinstalling the coldbox vacuum shell and beginning restoration of the insulating vacuum. Nitrogen cooldown should start the first week of July if vacuum checks are successful. Repairs and testing of the CC4 compressor outside the coldbox will proceed in parallel.
The new Cryogenic Test Facility (CTF) coldbox #3 has been shut down to address a problem with vendor-supplied relief valves resealing after actuation. U.S.-manufactured valves are being procured to replace the supplied European valves. The original coldbox #2 continues to support LCLS-II testing activities.
Extensive maintenance activities continue on the CEBAF accelerator, with work on RF system High Power Amplifiers, the pass-5 RF separator, RF controls, and system cooling. Preventative maintenance on the trim magnet system bulk power supplies and testing of cooling improvements to the arc box supplies continue. Several upgrades to improve system reliability continued on systems supported by the Instrumentation and Controls group.
A major effort to finalize documentation necessary to support a Final Design Review of the LCLS-II cryogenics plants is nearing its conclusion with about 2/3rd of the necessary drawings out of more than 500 submitted.
Facilities Management and Logistics
Hogan Drive Traffic Pattern Changes Reminder
Jefferson Lab Calendar of Events
July 10-14: PAC45
Environment, Safety, Health and Quality
Proper Use of Extension Cords as Temporary Power Sources
Take a moment to review your use of extension cords in your work areas using the tips above. If you find that your group is routinely using an extension cord as a source of electrical power in an area, you may request a new, permanent outlet by submitting a task via the Facilities Management Work Request System. If you have any questions about appropriate use of extension cords, contact Todd Kujawa at x7006.
Computing and Networking Infrastructure
Jefferson Lab Campus-Wide Phone Outage Scheduled for Saturday, July 8
To Get Help and Report Emergencies During the Outage:
Inquiries during the outage can be made to Jefferson Lab Security’s cell phone at 757-342-9868. For more information regarding this outage, contact the IT Division Helpdesk at firstname.lastname@example.org or x7155.
Major IT Systems Outage Set for Saturday, July 29
R.S.V.P. for Director’s Welcome Lunch: Reminder and More Information
Theorist Nobuo Sato awarded JSA Postdoctoral Prize
JSA Initiatives Fund Program Is Accepting Proposals
Jefferson Lab to Test Tornado Warning Siren at 10:30 a.m. on Friday, July 7
Reminder: Submittal Deadlines for FY2017 Approved Purchase Requisitions
TIAA-CREF Individual Counseling Sessions Offered Summer/Fall 2017
|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: the Communications Office or contact Kandice Carter at x7263.|