Jefferson Lab Weekly Briefs December 11, 2013
Jefferson Lab Weekly Briefs
December 11, 2013
12 GeV Upgrade
In-tunnel testing of the 12 GeV cryomodule known as C100-8 has resumed. Installation and final alignment is complete for the beamlines in the main "racetrack" of the accelerator, including closing locations used for access to the beam switchyard, injector, Hall D and southeast stub. Final vacuum hookup and alignment of the beamlines to Halls A, B and C are nearly complete. Final alignment of the Hall D beamline has been completed upstream of the shield wall/door at the top of the ramp. The arc 1 dipoles have been operated with the new arc 1 box supply. The arc 2 box supply is almost ready to connect to the dipole magnets. Box supplies for arcs 3 through 6, LAM1C, and the Hall A beamline are on site and in various stages of installation and testing. Delivery of the 20 Amp trim power supplies has resumed. The final procurements for the stripline beam position monitor electronics are about to go out. Installation of the Personnel Safety System for Hall D continues.
Jefferson Lab Published Articles, Dec. 2-6
Remember to submit your papers for approval to the Jefferson Lab Publications database.
Center for Theoretical and Computational Physics
A new paper explores the use of twisted boundary conditions in extracting the nucleon mass and the binding energy of two-baryon systems, such as the deuteron, from lattice QCD and lattice effective field theory calculations. By choosing clever boundary conditions, one can reduce finite volume contamination of the deuteron binding energy by a factor of 10-20 for moderate volumes. Using the experimentally determined phase shifts and mixing angles, the reported analysis determines the expected energies of the deuteron states over a range of lattice volumes for a selection of twisted boundary conditions and numerically confirms the analytical observations which are speculated to hold for arbitrary N-body systems.
The alignment group has been busy throughout the Jefferson Lab site. The initial alignment of the installed Hall B beamline components in the beam switchyard has been completed up to the shield wall. The final alignment of the Hall A beamline components, again in the BSY, is nearing completion. In Hall D, the Forward Drift Clamber located in the solenoid is undergoing initial alignment. Additionally in Hall B, the Pre-Shower Calorimeter detectors are being fiducialized relative to the forward carriage. In the group's magnetic measurement facility, the YB magnet refurbishment is being carried out.
Facilities Management & Logistics
Unplug Those Holiday Decorations
JLab Calendar of Events
Dec. 14: JAG Children's Holiday Party
Environment, Safety, Health and Quality
Junk Drawers and Nine-Volt Batteries
The simple way to prevent this from happening is to keep all batteries out of the junk drawer. Another solution is to cover batter terminals: keep the original plastic cap over the terminals of nine-volt batteries, seal off the terminals temporarily with electrical tape, or place the batteries in an intact plastic bag. These simple steps can protect you, your family and your coworkers from battery-initiated fire.
Computing and Networking Infrastructure
CNI Maintenance Period Set for Tuesday, Dec. 17, 5-7 p.m.
Test of Public Address System Will Intermittently Impact Live Calls
Due Today: One-Time Training Requirement for GERT/Radiation Workers
Ends Friday: Open Enrollment for GSRA
JAG Holiday Events - Toys for Tots, Party and Contest
Personal Dosimeter Changeout Set for Monday, Dec. 16
Annual Holiday Bake Sale Set for Friday, Dec. 20
Pressure Systems Awareness Training Offered
GEN034 Annual Security Awareness for Employees & Subcontractors
Tracking Thomas at Jefferson Lab
|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.|