Jefferson Lab Weekly Briefs April 22, 2015
Jefferson Lab Weekly Briefs
April 22, 2015
12 GeV Upgrade
The giant, concrete shield doors on the Hall C Super High Momentum Spectrometer (SHMS) have been outfitted with drive motors so that they may easily be opened and closed. Inside the shield house, the Heavy Gas Cerenkov (HGC) counter is now in position and connected to its data-acquisition electronics. Researchers from the University of Regina, who built the detector, obtained much of the funding for it through a grant from the Canadian government. The remainder of the detector was paid for by the 12 GeV Upgrade Project, as were the JLab-designed alignment, gas, and electronic systems.
The SHMS Q1 magnet, which arrived in January, has been cooled to liquid-helium temperature and successfully tested to its full design field. Connection of the HB magnet to its control, power, and cryogenic services is continuing on schedule. Cool-down testing is expected to begin soon, and power tests will follow.
The vendor of the final three SHMS magnets is making good progress. All coil winding has been completed, and only two of the 10 sub-coils remain to be impregnated with epoxy. The two sub-coils of the Dipole magnet have been glued together to form a cylindrical assembly, and the outer surface of this has been shaved down to make a nearly-perfect cylinder. The next step is to heat large aluminum rings and slip them over the coil so that when they cool and contract they will tightly squeeze the coil and hold the conductors in place.
Jefferson Lab Published Journal Articles, April 13-17
D. Wang et al. (The PVDIS Collaboration). "Measurement of parity-violating asymmetry in electron-deuteron inelastic scattering." Phys. Rev. C 91, 045506 (2015).
Tech notes, April 13-17
Records and Information Management Month Fact of the Week
Remember, lab records are lab property, and departing employees should not take records with them when they leave.
RIM Trivia Question of the Week
Last week's winner: Lori Zuckerman won the Starbucks gift card in a random drawing of correct answers. The answer to last week's trivia: Spy Game
Center for Theoretical and Computational Physics
A new paper <arXiv:1504.03973> from the Adelaide-Jefferson Lab-Manitoba collaboration examines the interference γZ box corrections to parity-violating elastic electron-proton scattering in the light of the recent observation <arXiv:1304.7741> of quark-hadron duality in parity-violating deep-inelastic scattering from the deuteron at low Q2. Using the similarity of electromagnetic and γZ structure function moments and those extracted from leading twist parton distributions down to Q2≈1 GeV2, duality is found to constrain the γZ box correction to the proton's weak charge to be (5.4 ± 0.4) x 10-3 at the kinematics of the Q-weak experiment. Within the same model, estimates are also provided of the γZ corrections for future experiments, such as MOLLER at Jefferson Lab..
Facilities Management and Logistics
Lab-wide Cleanup Set for April 27-30
TED Building Entrance Closed While Brickwork is Sealed
CEBAF Center Parking Lot Will Be Impacted During Utilities Infrastructure Upgrade Project
A temporary chiller and trailer will be staged inside the fence. The upgrade work will be occurring in the CEBAF Center mechanical room and data center. The work is scheduled to start the week of May 4 and continue until March 31, 2016.
Questions about this project may be directed to Michele Solaroli, Facilities Management, at x7751
The Machine Shop is presently manufacturing or continuing to manufacture:
For SRF - 5 Resonator Sample Support assemblies
And various small machining jobs for lab customers.
Environment, Safety, Health and Quality
Safe Digging at Home and at JLab
Home owners should contact Miss Utility at least three working days before you plan to dig/excavate. Remember, even if your project is small, it is always best to call. It’s a free service and it is for your safety.
At Jefferson Lab we have a similar process for digging/excavation and blind penetration operations. Refer to www.jlab.org/fm/ and look under ‘Fillable Forms’ for more information on these two activities.
Two Hurricane Preparedness Sales Tax Holidays Planned for 2015
VDEM is updating sales tax holiday outreach materials to reflect the upcoming campaign and will post them to www.vaemergency.gov as soon as possible.
Registration is Open for the May 13, JAG 30th Anniversary Run-A-Round
Register online at: https://misportal.jlab.org/webTools/2015-runaround/10140/registrations
Thanks to Participants of April 14 Blood Drive
The JLab Occupational Medicine staff and the Red Cross, extend a sincere thank you to everyone who participated with this blood drive. The next JLab blood drive will be in August.
TIAA-CREF Individual Counseling Available by Appointment
Reminder: RadCon Has Moved to 1st Floor Library Area of ARC Building
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: Public Affairs or contact Kandice Carter at x7263.|