Jefferson Lab Weekly Briefs July 15, 2009

Jefferson Lab Weekly Briefs

July 15, 2009

12 GeV Upgrade

The 12 GeV Accelerator Systems teams continue to focus on placing construction contracts. A contract was awarded for fabrication of the quadrupole magnets for the beam transport system. Review continues for the vendor proposals for "C"-dipoles (used in the spreaders and recombiners) and septa dipoles for the beam transport system. Both of the dipole contracts will include magnets for the extraction system. The contract to build the niobium accelerating cavities for the cryomodule system also was awarded. A design review was held last week for the preliminary installation plan for the accelerator systems.


The Scheduled Accelerator Down continued with maintenance on trim magnets, box power supplies, the personnel safety system, RF (radio frequency) cavities, diagnostic systems and more. A low-conductivity water leak for a trim magnet was found and repaired. On July 9, an Accelerator Hurricane Preparedness drill was conducted. Problems were indentified and addressed. Also on Thursday, there was an oil spill; about one quart of oil was released near the South Access Building cooling tower. The spill was contained and cleaned up in a timely manner. The Gun2 photocathode suitcase bake went well. The load chamber was also good. Pucks were swapped and the suitcase was removed.

Free-Electron Laser

The FEL team successfully completed measurements on the Light Pseudoscalar and Scalar Search experiment search for dark matter. Last week, beam time was provided for terahertz measurements and beam characterization in collaboration with a team from Cornell. The FEL was shut down on Thursday and Friday for hardware work on the site power supply and tests of hurricane preparedness.

Theory Center

In their latest paper <arXiv:0907.1060 [hep-ph]>, a collaboration of Theory Center staff and users from Lisbon, Portugal, computed the electromagnetic form factors of the Ω-, which is composed of three strange quarks, and the decuplet baryon magnetic moments using a quark model application of the Covariant Spectator Theory. The predictions for the Q2dependence of the Ω- electric and magnetic dipole form factors can be tested in the future by comparing with lattice QCD simulations at JLab at the physical strange quark mass.

JLab's Safety Numbers

191 Days since Last Recordable Accident (JLab record: 331)
308 Days since Last Lost Workday Accident (JLab record: 676)

JLab Calendar of Events

July 13-17: Tunnel Housekeeping
July 14-16: JLab Science and Technology Review
July 24: FEL Photon Science Workshop
July 29: American Red Cross Blood Drive
July 31: Science Education Summer Poster Session
Aug. 5: Safety Glasses Vendor onsite
Aug. 19: Jefferson Activities Group Luau
Aug. 19-21: GPUs for Lattice QCD Workshop
Sept. 7: Labor Day holiday
Sept. 17: JSA's Electronic Commerce Vendor Show




Environment, Safety, Health & Quality

ES&H Manual Revision Update and New Content
ES&H Manual Chapter 2410, Hazard Issues and Contractual Commitments, and its associated documents, Appendix T1 Hazard Issues List and Appendix T2 Hazard Issues and Contractual Commitments Update Procedure, were approved and released for lab-wide use on July 9.  

These documents detail how hazard issues at JLab are identified and addressed to ensure continued safe operations. Relevant issues include bloodborne pathogens, fire, various types of Oxygen Deficiency Hazards (ODH), radiation and others. Each line item in the manual lists a Subject Matter Expert (SME) and contact information, along with applicable laws or regulations, DOE guidance, contract clauses and applicable ES&H Manual Chapters. Also included is the procedure for review and determination of new issues and removal of non-relevant material.

These revised documents replace:
ES&H Manual Chapter 2410 Applicable Regulations and Contractual Commitments
Appendix T1 Jefferson Lab Hazard Issue List
Appendix T2 TJNAF Work Smart Standards Set
Appendix T3 Administrative ES&H Documents

If you have questions, contact Mary Jo Bailey at x7277.

Computing and Networking Infrastructure

Maintenance Day, Tuesday, July 21, 5-10 p.m.
The CNI group is planning a maintenance period from 5-10 p.m. on Tuesday, July 21. During this period, jlabl1 and jlabl3 will be rebooted. In addition, patches will be pushed out to all Computer Center-managed systems. To insure that the patches will install correctly with the least inconvenience, log out of your system when you leave on July 21, but leave the system powered up overnight to receive the patches. Plan on rebooting your system on July 22 after the patches have been delivered. If you experience issues with your system after the reboot, contact the Helpdesk at x7155.


Last Chance for Cholesterol Screening
Cholesterol screening is available for JLab and State employees through July 17. To schedule an appointment, call Occupational Medicine at x7539. If you have received this test within the last year, this includes Medical Monitoring, please let others take advantage of this opportunity.

Keeping an Eye on Hall D Construction
A live-feed camera has been trained on the Hall D construction site. Now anyone can see construction progress without a hard hat or steel-toe boots. You can access the feed with your web browser online. The camera is also linked off the JLab homepage.

TEDF in 3-D
An animated tour of the the Technology and Engineering Development Facility building project is now playing on the flat screen television in the CEBAF Center lobby and is also available online. The project will modernize the existing Test Lab and provide additional space for the Superconducting Radio Frequency (SRF) Institute and provide office and technical space for engineering groups.

American Red Cross Blood Drive
The next American Red Cross Blood Drive is scheduled for Wednesday, July 29, from 10 a.m. - 4 p.m. in CEBAF Center room F113. New and repeat donors are encouraged to attend. Walk-ins are welcome; however, making an appointment allows the Red Cross to schedule adequate staff for the visit. Volunteers are also needed to help with the blood drive. To schedule an appointment or to volunteer, contact Johnie Banks at x7539 or