Jefferson Lab Weekly Briefs
April 1, 2015
12 GeV UpgradeThe fifth of six coils needed for the CLAS12 torus magnet arrived in its coil case from Fermilab on March 21 and was prepared for testing at liquid nitrogen temperatures. The fourth coil has completed this test at Jefferson Lab and is being readied for adding layers of multi-layer insulation (MLI), to be followed by the thermal shield, more MLI and its cryostat. The third coil has been placed into its cryostat which is now being welded, the second has been moved to Hall B in preparation for mounting, and the first coil is now mounted in place on the cold hub for the torus in Hall B.
The vendor for the CLAS12 solenoid magnet is in production with the start of winding for the first of five major coils. Winding is expected to complete in Fall 2015. A contract has been placed to build the distribution can for the cryogenics for both the CLAS12 torus and solenoid magnets with delivery expected in October 2015. The vendor for the power supplies for the magnets has finished construction and is putting them through a series of in-factory tests before shipment to Jefferson Lab.
PhysicsJefferson Lab Published Journal Articles March 23-27
Records and Information Management Month Fact of the Week
Jefferson Lab's Information Resources staff is diligently working on cataloging the works of the pioneers and early leaders of the lab. If you have old written, photographic or electronic material in your office which you think might have historical archival value, send an email to Kim Kindrew with the following information: consecutive dates of materials, names of associated individuals, the location and condition of the materials, and any event or accomplishment to which the materials relate.
RIM Trivia Question of the Week
This week's trivia question: In Tolkien's The Lord of the Rings film adaptation, "The Fellowship of the Ring," Bilbo uses his funny magic ring and mysteriously disappears from his own birthday party after insulting many of his guests. Once Bilbo leaves the Shire for Rivendell, the ring is left with Frodo for safe keeping. Meanwhile, Gandalf visits archives in Gondor to read up on the history and characteristics of the one ring, in order to rule out the possibility that Bilbo's funny magic ring was the ring of power. Name any one of the things that Gandalf does in the archives that is definitely not allowed in Jefferson Lab's archives room (or any other modern archives).
All responses must be received by Kim Kindrew by noon on Friday, when a random drawing will take place of all correct answers. One person will win a Starbucks gift card! (Winners will be notified via email no later than 5 p.m. Friday following publication. Limit one gift card win per person.)
JSA Minority/Female Undergraduate Research Assistantship
Jefferson Lab is seeking candidates for a Research Assistantship. JSA will provide funds to support a junior or senior level student at the university during the 2015-2016 academic year. In recent years, students have used the funds to aid the exploration of 3D printed scintillator detectors for the study of field emission in accelerating cavities, as well as a presentation at the SESAPS conference on work done on the PrimEx-II Collaboration. Nominations will be accepted through April 17. For more information, visit the website.
Center for Theoretical and Computational PhysicsRecent theoretical work has provided new insight into the charge and magnetization densities in the proton's periphery, where they arise from the "pion cloud" and can be computed from first principles using methods of chiral effective field theory. The orbital motion of the quantum pions surrounding the proton causes a left-right asymmetry of the internal current in a transversely polarized state and leads to a simple relation between the peripheral charge and magnetization densities. The striking effect attests to the relativistic nature of pion-nucleon dynamics and could be observed in measurements of proton and neutron elastic form factors at Jefferson Lab and other facilities.
EngineeringThe Electrical Engineering Systems (EES) department has had a busy few weeks. The major effort in the past several weeks has been to support operation of the accelerator during set up for three-hall operation. This effort required maintaining and repairing all the usual systems while concentrating on commissioning of the new 750 MHz radiofrequency beam separators that allow simultaneous running of multiple halls at full energy. When a site-wide power outage occurred, efforts were shifted to a rapid response to secure critical systems and to begin recovery and checkout of all accelerator components.
Other tasks that have been in progress have included support for 12 GeV Hall B engineering, work on the LCLS-II project low-level RF controls, planning and costing for an Injector Test Facility (UITF ), a Personnel Safety System Design Review and multiple other improvement projects for the accelerator (dogleg power supply construction, Harp improvements, cavity and stripline beam position monitor upgrades for Halls B and D, and accelerator path length diagnostic enhancements). More of the same is expected as time marches towards the summer shutdown.
Environment, Safety, Health & 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.
Vote for Your Favorite 2015 Jefferson Lab T-Shirt Design
TIAA-CREF Individual Counseling Available by Appointment
Reminder: RadCon Services Limited March 25-April 17
Student Projects, Volunteer Mentors Needed for High School Interns
Jefferson Lab Calendar of EventsApril 11-14: APS April Meeting
April 14: American Red Cross Blood Drive
April 19-20: A' Experiment (APEX) 2015 Collaboration Meeting
May 3-8: International Particle Accelerator Conference (IPAC15)
May 13: JAG Run-A-Round
|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.|