Jefferson Lab Weekly Briefs August 22, 2012
Jefferson Lab Weekly Briefs
August 22, 2012
De-installation of Q-weak is near completion in Hall C. All Q-weak detectors, instrumentation, collimators and shielding have been removed from the hall. The Q-weak-specific beamline and instrumentation from the Moller platform to the short stub near the beam dump have also been taken down and are being moved to storage. The Q-weak toroidal magnet has been disassembled and is also being prepared for storage. Work has started on removing detector hut shielding from the Short Orbit Spectrometer in preparation for its full removal.
The FEL team has made significant progress in planning the upgrades to ensure that the machine is ready for operations as soon as the new Central Helium Liquefier is operational. The FEL was one of the participants in the surveillance audit to maintain certification in the OHSAS 18001 Occupational Health and Safety Management System, for which JLab qualified last year. Carlos Hernandez-Garcia chaired the FEL and Synchrotron session at the Conference on Accelerator Applications for Research and Industry (CAARI) held in Fort Worth last week.
Center for Theoretical and Computational Physics
A new paper reports a state-of-the-art calculation of the photon-Z boson box radiative correction to weak charges of bound protons and neutrons in atomic parity-violation measurements on heavy nuclei, such as 133Cs and 213Ra. For the first time, a small but important additional correction arising from Pauli blocking of nucleons in a heavy nucleus has been evaluated, resulting in a significant shift to the weak charge of 133Cs, approximately four times larger than the current uncertainty on the weak mixing angle, sin2θW, but with a reduced error compared to earlier estimates. This calculation will refine the baseline Standard Model result with which JLab's Q-weak experiment will compare its findings.
Hall D Cryogenics Design and Installation
CHL-2 Warm Compressor and Warm Gas/Oil/Water/Air Management Systems
CHL2 300K-4.5K Cold Box Systems
CHL1 and Linac Summer Shutdown
End Station Refrigerator and Cryogenic Test Facility Refrigerator
Facilities Management and Logistics
ARC Building: Power Outage All Day Saturday, Aug. 25
JLab Calendar of Events
Aug. 22: Colloquium and Public Lecture - Studying the Quark-Gluon Plasma
Computing and Networking Infrastructure
Zimbra Calendar Testing Continues
Zimbra Training Offered in August
JLab Rocks Video on YouTube
New Dates Offered for Onsite TIAA-CREF Counseling
JLab Publications Refresher Training Offered
Studying the Quark-Gluon Plasma - Colloquium and Public Lecture
The United Way School Tools Drive Is Underway
Tracking Thomas at JLab
A belated congratulations for identifying the Aug. 8 location goes out to Doug Higinbotham. Congratulations this week go to Samika Hawkins, Kevin Jordan, Chase Dubbe, Brita Hampton and Lori Zukerman, who were the first to correctly identify the location for Aug. 15. Honorable mentions go to Michael Haddox-Schatz, Narciso Gomez, Michelle Shinn, Ron Bartek, Debbie Campbell, Jason Willoughby, Harry Fanning, Robert Martin and Mike Lewellen. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.