Jefferson Lab Weekly Briefs April 30, 2014
Jefferson Lab Weekly Briefs
April 30, 2014
12 GeV Upgrade
The Hall D segment of the Personnel Safety System has been certified. The Hall D tagger dump water system is operational, with checks of the controls underway. The beamline to the dump is under vacuum. Checks of the beam diagnostics are underway.
During initial in-tunnel operation of the ZA septa magnets in the west end of the accelerator on April 15, an electrical ground-fault occurred. This led to burn-through of a magnet coil and vacuum chamber, which permitted water to flood the beamline vacuum space in the region. An investigation determined that the ground-fault was caused by debris on the magnet between the coil and the vacuum chamber, likely introduced after installation in the tunnel. The cause of the burn-through was determined to be incorrect vendor assembly of the associated new box power supply, which made it possible for large ground currents to flow without tripping the detection circuit. The ZA magnet has been repaired and re-installed. Modifications have been done to that magnet and all similar ones to prevent debris from getting to critical locations. All new box power supplies have been modified to correct the assembly error. The magnet that failed has now been operated at the required setting for delivering 10 GeV beam to the Hall D beamline.
JSA Sabbatical and Research Leave Support at Jefferson Lab
Jefferson Lab Published Journal Articles, March 31-April 6
Records and Information Management Month Fact of the Week
RIM Trivia Question of the Week
This week's trivia question (and the final question): In the film Star Wars: Attack of the Clones, Obi-Wan Kenobi visits the Jedi Archives in search of a planet. After examining maps, he has a conversation with the Jedi Archivist, who tells him, "If an item does not appear in our records, it does not exist." What is the name of the planet Obi-Wan was looking for? All responses must be received at firstname.lastname@example.org by noon on Friday, when a random drawing will take place of all correct answers. One person will win a Starbucks gift card! (Winners will be notified via email no later than 5 p.m. Friday following publication. Limit one gift card win per person.)
Center for Theoretical and Computational Physics
The transverse single spin asymmetry, AN, in inclusive lepton-proton hadron production is very similar in kinematics to the corresponding asymmetry in proton-proton scattering, allowing the possibility of testing transverse momentum dependent (TMD) factorization at high energies. A new paper calculates AN using TMD functions extracted from semi-inclusive deep-inelastic scattering, and it shows that the results are compatible with HERMES data at high transverse momenta of the produced pion. Predictions for future measurements at Jefferson Lab at 12 GeV and an Electron-Ion Collider are also presented.
Facilities Management and Logistics
The cleanup also provides an excellent time to identify and remove excess equipment and furniture. Contact the Property Office at x7348 for the removal of excess and unused equipment, furniture and materials.
During the cleanup, please be careful not to mix recyclables. In other words, wood scrap, recyclable metals, cardboard, paper and other permissible recyclable office waste go into the proper collection containers at the Central Materials Storage Area (CMSA). General waste is to be collected and brought to the CMSA’s “trash” compactor. For those who do not have access to the CMSA, the gate will be open daily May 5-9, 10 a.m. to 2 p.m. for your convenience.
Jefferson Lab Calendar of Events
May 7: JAG Annual Run-A-Round
Environment, Safety, Health and Quality
Lock, Tag and Try
If you have questions about this or any other safety topics, talk to your supervisor or ESH&Q staff. For more information on Jefferson Lab’s LTT policy and procedure, refer to ES&H Manual Chapter 6110, Lock, Tag, Try (LTT) Program.
Open House Volunteers Still Needed
Monthly Tornado Siren Test Set for Friday
Registration is Open for the May 7 JAG Run-A-Round
Help Make the Run-A-Round a Success
Jefferson Science Associates Minority/Female Undergraduate Research Assistantship
Student Projects, Volunteer Mentors Needed for High School Interns
Tracking Thomas at Jefferson Lab
|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.|