Jefferson Lab Weekly Briefs October 8, 2014
Jefferson Lab Weekly Briefs
October 8, 2014
12 GeV Upgrade
Construction of the first two of the five magnets for the Hall C Super High Momentum Spectrometer (SHMS), namely the horizontal bend (HB) dipole and Q1 quadrupole magnets, is now in the latter stages. The HB magnet has had the inner multi-layer insulation (MLI) added to the helium vessel, followed by the attachment of the copper thermal shield, which will be held at liquid nitrogen temperature during operation, and the outer MLI then added. The first several pieces of the outer vacuum cryostat have been welded together. Q1 has been placed inside the vacuum cryostat and had the final instrumentation and cryogenics control reservoir added. Unfortunately, a small leak in the nitrogen circuit has appeared, requiring an intervention to repair it. The first production coil for the dipole magnet has been epoxy impregnated and removed from the winding mandrel, and the second coil is being readied. Winding of the first two coils for the Q2 magnet is well underway and will be followed by the winding of the Q3 magnet.
Reminder: Users Group Satellite Meeting at DNP
Jefferson Lab Tech Note Submitted Sept. 29 - Oct. 3
Remember to submit your papers for approval to the Jefferson Lab Publications database.
Center for Theoretical and Computational Physics
The observation of the d - u flavor asymmetry in the proton has been one of the most stimulating results in hadronic physics of the past two decades. A new paper computes this asymmetry in chiral effective theory, including both nucleon and Δ degrees of freedom, placing the calculation on firm theoretical footing in QCD. In addition to the distribution at positive quark momentum fractions x, corrections to the asymmetry are also found to arise from pion rainbow and bubble diagrams at zero momentum, which have not been accounted for in previous analyses.
Jefferson Lab Calendar of Events
Oct. 9: Public Presentation: Cryo Show
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.
JLab SOTR Training Registration Ends Oct. 9
Red Cross Blood Drive Scheduled for Oct. 31
Discount Entertainment Tickets Available
Pick Up Catalog with 2015 Calendars & Day-Timer Items from Procurement
Register for Jefferson Lab Fall Golf Outing
Annual Performance Appraisal Process Underway
Fitness Room Now Open
Flu Vaccines Offered by Appointment
|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.|