Jefferson Lab Weekly Briefs
June 26, 2013
12 GeV Upgrade
The tenth and final C100 cryomodule has been installed in the tunnel. In-tunnel testing of C100-7 has been completed; the total voltage for that cryomodule was 108 Megavolts. In-tunnel testing of C100-6 is underway. All of the dipoles and 90 percent of the girders have been installed in the beamline to the Hall D tagger enclosure. The extraction chicane dipoles have been installed. Final alignment of the east arcs is complete and is nearly complete for the west arcs. Installation of the west recombiner and transport channel recombiner are nearly complete; the east spreader is complete except for two septa. The east recombiner is under vacuum. Assembly of the new radiofrequency separator cavities is underway. Fabrication of the Personnel Safety System beam stoppers/diffusers has begun; the associated electronics are on order. Seventy-five of the new 20A trim supplies are now on site; thirty of the units have been installed. Vendor testing of the new box supply for arc 1 is nearly complete; testing of the new supply for the beamline to Hall A has begun. Procurement of the electronics for the new stripline beam position monitors continues.
Center for Theoretical and Computational Physics
A new relativistic formulation of pion loop corrections to the coupling of photons with nucleons is presented on the light-front, explicitly satisfying gauge invariance and Ward-Takahashi identity constraints to all orders in the pion mass expansion. The results are used to compute corrections to moments of parton distributions measured in deep-inelastic scattering experiments or in lattice QCD. Comparisons of results for pseudovector and pseudoscalar coupling of pions to nucleons allows the resolution of a long-standing puzzle in the computation of pion cloud corrections to structure function moments.
The Machine Shop is presently manufacturing or continuing to manufacture:
The shop has processed 105 job requests since April 13.
JLab Calendar of Events
July 4: Independence Day holiday, Jefferson Lab closed
Environment, Safety, Health and Quality
Roadway Breakdown Safety
People often choose to exit a broken-down car, whether it's to stay cool, retrieve a spare tire or to get better cell phone reception to call for assistance. However, there are safe and unsafe ways to wait on the roadside. When exiting the vehicle, always do so on the side opposite the lanes of travel. Once out of the vehicle, stand slightly to the rear of the vehicle and off to the side of the road, preferably on the non-road side of a guard rail (if present). This location is the safest in the event the disabled car is sideswiped or struck from behind by oncoming traffic.
To assist drivers in avoiding breakdowns, the National Highway Traffic Safety Administration offers valuable tips for preparing for your next roadtrip. If your car does break down, these tips from The Weather Channel may also be useful.
Computing and Networking Infrastructure
Site-Wide Network Outage Set for Saturday, July 20
Revised General Access Radiological Worker Permit
The GARWP is titled SAF801kd, and the change is located in the middle of page 3, item #9. A revision date of June 25, 2013, should be shown in the upper left hand corner of this document. Make sure you refresh your browser once you have opened this document, to make sure you have the newest version. You can locate the document on the web-based training page. If you have questions or concerns, contact Becky Mosbrucker, x7236, or the Radiation Control group cell phone at 876-1743.
Reminder: New Electronic Tour Database
Second Chance: Pressure Systems Safety Awareness Training Offered
Radiation Worker Classes Available
Personal Dosimeter Change Out Set for Monday, July 8
Tracking Thomas at Jefferson Lab
Samika Hawkins correctly guessed the location for June 19. Honorable mentions go to David Sheppard, Brita Hampton, Randy Hartman, Danny Lloyd, Connie Adams, Dick Owen, Ron Bartek, Carl Zorn and Michael Haddox-Schatz. Check out Tracking Thomas on flickr for a better view of his last location and this week's new mystery photo.
|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.|