Jefferson Lab Weekly Briefs January 18, 2017
Jefferson Lab Weekly Briefs
January 18, 2017
12 GeV Upgrade
In-place assembly and testing are proceeding on Hall C's three newest superconducting magnets in the Super High Momentum Spectrometer (SHMS). The Q2 quadrupole magnet has reached 106 percent of the current required for the maximum SHMS momentum (11 GeV/c). Stable operation for 11 GeV/c physics has been demonstrated, and final acceptance tests are underway. Welding of the cryogenic helium pipes between the dipole magnet and its service can has been finished and leak-checked, and the first-pass weld of the nitrogen lines is done. The dipole helium circuit has passed its pressure test. Leak-checks of the Q3 magnet vacuum system are underway. Pressure-testing of the Q3 helium and nitrogen circuits will come next. At the same time, connection and checkout of the Q3 and dipole instrumentation systems are moving forward.
With all but one of the SHMS detectors in place, a cosmic-ray trigger has been set up to collect signals from the detectors and exercise the data-acquisition hardware and the event-reconstruction software. Stands for the beam pipe downstream of the recently installed target are in place, and much of the vacuum pipe has been erected. Limit switches and wiring to allow remotely controlled rotation of the SHMS is being prepared.
Jefferson Lab Published Journal Articles, Jan. 8-14
JSA Postdoctoral Research Prize Submissions Due Jan. 27
Nominate A Colleague for the 2017 Outstanding Nuclear Physicist Award
Nominations Are Being Accepted for the 2016 JSA Thesis Prize
Center for Theoretical and Computational Physics
A series of recent articles, including this one and another, investigates new types of functions describing hadronic structure: parton “quasi-distributions.” These specify how the hadron's three-momentum is shared among its quark and gluon constituents. Patterns are proposed showing how the distributions change when the hadron momentum increases, and how they approach the usual parton distribution functions in the limit of infinite momentum.
Facilities Management and Logistics
Jefferson Lab Entrance at Rattley Road Closed for Construction on Saturday, Jan. 21
Jefferson Lab Calendar of Events
Jan. 18-19: Hall A Collaboration Meeting
Environment, Safety, Health and Quality
Truncated Site-Wide Alert Text Messages
Test of Public Address System Set for Today at 5:30 p.m.
Red Cross Blood Drive Scheduled for Tuesday, Jan. 24
Quark Cafe Update
Jefferson Lab Travelers and Travel Coordinators: Critical Foreign Travel Suspense Dates
Update: Travel to France
Jefferson Lab Travelers: Check Your Itineraries for Errors
Science Bowl Volunteers Still Needed
Volunteers Sought to Help with Engineering/STEM Career Days on Feb. 23-24
Holiday Decorating Contest Winners Announced
|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.|