Jefferson Lab Weekly Briefs
June 21, 2017
Jefferson Lab Published Journal Articles, June 11-17
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
A new collinear factorization analysis of inclusive deep-inelastic scattering with nonperturbative jet correlators has shown that a novel spin-flip term associated with the invariant mass of the produced hadrons couples to the target's transversity distribution. This provides a hitherto neglected and large contribution to the twist-3 part of the g2 structure function, which can explain the discrepancy between recent calculations and empirical analyses. It also provides an extension of the Burkhardt-Cottingham sum rule, putting constraints on the small-x behavior of the transversity function, as well as an extension of the Efremov-Teryaev-Leader sum rule, suggesting a novel way to measure the tensor charge of the proton.
Facilities Management and Logistics
Limited Access to CEBAF Center F-Wing First Floor on June 24
Annual Property Inventory Underway
Reminders: If a tagged item is going to be put in a different location on-site for more than 30 days, a Movement Request must be submitted to the Property Management section; also, for any tagged item a Property Custodian plans to take off-site, the custodian must apply for and have a fully approved Property Pass or Temporary Property Movement (a loan) for the item.
More information about the property inventory and requirements can be found in the full memo.
A Lessons Learned Pressure Systems training session for Design Authorities and System Owners is being held on June 27 at 1:30 p.m. in ARC 231/233. Speakers will discuss recent changes to the ASME Pressure Piping Code B31.3, operator training, and recent experiences in procuring and fabricating systems to the Pressure and Vacuum Systems Safety Supplement.
Preventive maintenance continues for the Electrical Engineering Support department (EES). The RF group performed testing in the Low Energy Recirculator Facility to determine klystron suitability for supporting the soon-to-be-installed C50-13 in zone 1L13. They also completed the removal of the waveguide in 1L13 prior to removing the old cryomodule. The fabrication and testing of control chassis for the Upgrade Injector Test Facility and Linac Coherent Light Source II (LCLS-II) continue. The polarized gun (PGUN) viewer control upgrade, along with cable pulling and termination in the injector, was completed by the Instrumentation and Control group. The Safety System group is supporting the ongoing upgrade to Hall A’s ion chamber system.
A major effort from the Cryogenics department and Mechanical Engineering group continues to close out the design and documentation effort to support installation of the LCLS-II Cryogenics Plants 1 & 2. Progress is good, but it continues to be a challenge to deliver the documentation in time to support the project schedule. Conceptual modeling for Jefferson Lab Electron-Ion Collider Interaction Region magnets continues. Many groups within Engineering continue to work with the 12 GeV project to support efforts to complete the Hall B solenoid and get it delivered, installed and commissioned by the end of the year. Multiple shift operations are being planned to support this effort throughout the summer.
Environment, Safety, Health and Quality
Calibration and Control of Measurement and Test Equipment
Per Jefferson Lab’s Graded Approach Procedure, exceptions to the above requirements are allowed for infrequently used M&TE. If it is used at intervals exceeding the recommended frequency (e.g., a piece of M&TE is only needed every five years, but the recommended frequency is annually), Jefferson Lab does not require that it be maintained in a “Calibrated” state. However, prior to use, M&TE calibration status must be current. Per Jefferson Lab’s Calibration and Control Procedure for M&TE, the owner has the option to make a conscious decision to calibrate the item only at intervals to correspond to actual use.
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.
Annual Electricity Reduction Test Set for June 22
TIAA-CREF Individual Counseling Sessions Offered Summer/Fall 2017
Jefferson Lab Calendar of Events
|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.|