Jefferson Lab Weekly Briefs
August 5, 2015
12 GeV UpgradeThe sixth and final Torus coil was welded into its cryostat, moved to Hall B, and mounted on the cold hub as of June 26. All 12 of the “hex beams” that position the coils and provide shielded space to run cryogenic, power and instrumentation services between coils, as well as out to the cryogenic service tower and power supply, have been installed. Splices of the conductor running between each coil have been completed, and the required instrumentation and insulation has been added.
The vendor building the cryogenics distribution cans for both the Torus and Solenoid magnets has completed the first major assembly point and projects delivery in October 2015. The fabrication of the cryogenics control can has commenced in parallel at Jefferson Lab. The magnet power supplies have been located on the space frame platform upstream of the experiment and are having power and water services connected. Fabrication of the instrumentation chassis and racks together with the cable harnesses and needed firmware is also progressing.
The vendor for the Solenoid magnet, ETI, completed the winding, potting and machining of the second “Inner” coil, which is the second of five major coils needed for that magnet. The winding bobbin for the next two “Intermediate” coils has been delivered to ETI; this includes the helium cooling channel for the magnet as well as the spaces where the two Inner coils will be mounted after the Intermediate coils are wound and potted. The bobbin for the fifth, or “Shield,” coil is ordered for delivery by early fall.
Center for Theoretical and Computational PhysicsA new Theory Center paper presents the first ab initio calculation of a radiative transition of an hadronic resonance within quantum chromodynamics. The amplitude for ππ → πγ⋆ is calculated, as a function of the energy of the ππ pair and the virtuality of the photon, in the kinematic regime where ππ couples strongly to the unstable ρ resonance. The analysis can describe the energy dependence of the transition amplitude, which can be analytically continued to the ρ pole, and the ρ → πγ⋆ form-factor can be identified from its residue.
EngineeringThe Electrical Engineering Support group held a luncheon last week celebrating the life of Wesley "Woody" Woodworth, who passed away earlier in July. Woody, who was retired, was a long time member of the RF group and a well loved friend and co-worker for all of EES.
During the past few weeks of the Scheduled Accelerator Down, the Installation group has made significant progress on the Hall C dump upgrade with the following work:
- All of the dump tear out was completed.
- The dump face was cleaned and inspected using ultrasound. There were no defects. It can continue to be used, as-is.
- The two sections of the helium pipe were disconnected from the dump in order to inspect the face, and the burn through detector was removed.
- The helium pipes were leak checked, inspected, cleaned as needed, reinstalled onto the dump, and re-leak checked. There are no leaks!
The Installation group also installed the Moller quads and additional stands in support of the Hall C beamline upgrade. In Hall B, the group fabricated and installed Low Conductivity Water system manifolds and hosing for the Torus and Solenoid power supplies.
The Vacuum group completed the linac viewer bellows replacements and is working on the last few ion pumps doing troubleshooting/repair/replacements. The group continues to work with ICN on the last of the harp and viewer installs.
Jefferson Lab Calendar of EventsAug. 17: Safety Shoe Vendor on-site
Aug. 18: American Red Cross Blood Drive
Aug. 12-13: MOLLER Collaboration Meeting
Aug. 19-21: Q-weak Collaboration Meeting
Sept. 7: Labor Day holiday; Jefferson Lab closed
Sept. 13-18 XVI International Conference on Hadron Spectroscopy
Sept. 21: Safety Shoe Vendor on-site
Sept. 28-Oct. 2: International Workshop on Beam Cooling and Related Topics
Environment, Safety, Health & Quality
Simple Chemical Safety Practices
Computing and Networking InfrastructureCryptocard MP-1 Token Change
The CNI group is working on an upgrade to the Cryptocard token software currently in use at the lab. The upgrade should be complete by Thursday, Aug 6. All currently supplied hardware and software tokens should continue to work after the upgrade; however, the MP-1 (software) tokens will begin to require the use of the "-" (dash) in the generated one-time password. So, for example, if your MP-1 token on your smartphone generates a one-time password of 123-4567, then currently you can type 1234567 when using it to login. After the upgrade later this week, you must type the generated password with the displayed dash included. So, in our example above, you would type "123-4567" instead of 1234567. If you have any questions or concerns about the Cyrptocard changes, contact the IT Division Helpdesk at email@example.com or x7155.
Volunteers Needed for Science Camp
Tornado Warning Siren Test Set for Friday, August 7
Virginia will hold a Sales Tax Holiday over this weekend, Aug. 7-9, for school supplies (including some types of clothing), hurricane preparedness items, and Energy Star appliances. An overview of the exempt items may be found online.
Feds Feed Families Local Campaign
The Department of Energy is again participating in the "Feds Feed Families" food drive this year. At Jefferson Lab, the Thomas Jefferson Site Office will be collecting donations from its federal employees to benefit the Foodbank of the Virginia Peninsula. There is no expectation of Jefferson Lab employee participation in this program, although anyone wishing to contribute may do so. Marked donation boxes for non-perishable food items will be located in the CEBAF Center lobby August 10-31. For more information, visit the Feds Feed Families website or contact Steve Neilson at x7215.
|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.|