Jefferson Lab Weekly Briefs December 15, 2016
Jefferson Lab Weekly Briefs
December 15, 2016
12 GeV Upgrade
Hall C: With the arrival of the Q3 magnet early this month, all of the major components of the Super High Momentum Spectrometer (SHMS) are now on site. Two days after it was delivered, Q3 was in its cradle on the spectrometer carriage and the iron yoke had been reassembled around it. Its fully-installed twin, Q2, which arrived two months earlier, is undergoing power tests at increasing currents. To date, it has been successfully operated at more than 90 percent of the anticipated operations current.
Visiting staff from the French magnet factory finished splicing the superconducting current leads on the Dipole magnet in Hall C last week. Jefferson Lab welders are now closing up the cryogenic piping between the magnet cryostat and the service vessel above it. Clam-shell sections of large helium pipes have been welded in place around the current leads and instrumentation wires. Over the next several weeks the Dipole magnet will undergo a series of leak and pressure tests as successive layers of pipes and insulation are put in place.
The reconfigured quartz-bar hodoscope is back in place in the SHMS detector stack. The final SHMS detector, the Noble-Gas Cerenkov Counter (NGC), will be installed as soon as the Dipole magnet work is further advanced. A test-installation of the NGC was performed recently to verify that it mates correctly with its mounting frame.
Hall A and Hall D
Submissions Due by Jan. 27 for JSA Postdoctoral Research Prize
L’Oréal-UNESCO For Women in Science Program Applications Due Feb. 3
Nominate A Colleague for the 2017 Outstanding Nuclear Physicist Award
Center for Theoretical and Computational Physics
The isovector charges of the nucleon are key measures of our ability to study the properties of the nucleon from first principles, and are crucial to certain experiments seeking evidence of new theories beyond the Standard Model. A recent Theory Center paper calculated these charges from first principle using lattice QCD, and showed that one of the main systematic uncertainties in their calculation, namely that due to the contribution of excited states, could be effectively removed through the use of the variational method. The calculation was performed at rather larger-than-physical quark masses, and lays the groundwork for future calculations using lattices generated by the JLab lattice group at physical quark masses that will be able to directly confront experiment.
The machine shop is presently manufacturing or continuing to manufacture the following:
Facilities Management and Logistics
New Energy Conservation Measure Being Implemented; Personal Appliance Prohibition Reminder
The Jefferson Lab Energy Conservation Policy is designed to provide safe, comfortable conditions and energy efficient operation of heating, cooling and lighting equipment throughout the site. To reduce energy consumption and costs, air handling ventilation fans serving office areas will automatically shut down at 5 p.m. instead of 6 p.m.
Also, prior to the holiday shutdown period, please remove all personal (not Lab owned) appliances including portable heaters, compact refrigerators, coffee makers, microwave ovens, etc. from the site. These devices are prohibited at the lab not only because they contribute to increased energy consumption and impact the effectiveness of automated building temperature controls, but can also represent an unsafe fire-hazard concern. During the holiday shutdown period, Lab security will conduct a site-wide survey to assure personal appliances have been removed.
The full memo is online at: https://www.jlab.org/memo/new-energy-conservation-measures-being-implemented-holiday-shutdown
The Jefferson Lab Energy Conservation Policy is online at: https://www.jlab.org/fm/energymanagement/JLab_Energy_Conservation_Policy.pdf
Environment, Safety, Health and Quality
Everyone with Radiation Worker training at Jefferson Lab: the Radiation Control department has posted the General Access Radiation Work Permit (RWP) for 2017. All trained radiation workers must read and electronically sign the new General Access Radiation Work Permit. If an individual does not complete this training by Dec. 31, 2016, he or she will not have access to the accelerator site until the requirement is completed. If a person hasn’t completed the training by Jan. 6, 2017, their personal dosimeter will be pulled from the dosimeter rack. This year's RWP contains new restrictions/policies, so please read it in its entirety. The document is online at: http://www.jlab.org/div_dept/train/webbasedtraining.html (click on SAF801kd). Clear your cache from your web browser if you do not see the newest RWP.
Computing and Networking Infrastructure
IT Maintenance Scheduled for Tuesday, Dec. 20, 5-7 p.m.
Group (M: drive) Outage Planned for Tuesday, Dec. 27
Personal Dosimeter Change Out to Begin at 10 a.m. on Tuesday, Dec. 20
No Holiday Bake Sale
TIAA-CREF Individual Counseling Sessions - New 2017 Dates Announced
Subcontracting Officer Technical Representative (SOTR) Training Offered
Sentara Mobile Mammography Unit On-Site Jan. 13
Jefferson Lab Calendar of Events
Dec. 23-Jan. 2: Winter holidays and shutdown days - Jefferson Lab closed
|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.|