Jefferson Lab Weekly Briefs January 19, 2011
Jefferson Lab Weekly Briefs
January 19, 2011
12 GeV Upgrade
Installation planning for the upcoming six-month machine shutdown (mid-May to mid-November 2011) includes coordination of transportation, material handling equipment, and storage needs across the 12 GeV project. Weekly meetings continue to ensure effective integration of the 12 GeV installation activities within the JLab site-wide plan for the shutdown. Installation activities in Hall D are in progress following the ready–for-equipment milestone last month. The rules for conducting and coordinating work in Hall D can be found on the JLab web-based training document, SAF 113kd.
JSA/JLab Graduate Fellowship Program
JSA/JLab Sabbatical Support Program
The accelerator had been delivering beam to Halls B and C with some downtime. On Tuesday, the power supply of a trim rack failed and the faulty power supply was replaced. Hall B nanoamp beam position monitors had problems on a few occasions, which interrupted the beam delivery to Hall B each time. At times, high-current beam to Hall C was not stable, which the experts are still investigating.
The FEL team was able to verify that the lab penetrations will not be a radiation issue when they are filled with optical transport pipe for the ultraviolet and vacuum UV transport. This week, the team did a number of set ups and tests to verify readiness to perform the U.S. Particle Accelerator School class for the next two weeks, which includes guided hands-on FEL operational experience.
Theoretical and Computational Physics
Combining JLab data on unpolarized and polarized inclusive proton structure functions, a new paper <arXiv:1101.2016 [nucl-th]> reports the results of the first study of quark-hadron duality in individual helicity-1/2 and helicity-3/2 virtual photoproduction cross sections. The analysis finds that duality is realized more clearly in the helicity-1/2 channel, with duality-violating corrections <10 percent over the entire nucleon resonance region, while larger, <20 percent corrections are found in the helicity-3/2 sector. The results are in general agreement with quark model expectations and suggest that data above the Δ resonance region may be used to constrain both spin-averaged and spin-dependent parton distributions.
Young Scientist Prize - Computational Physics
Engineering Division Professional Development Program
The first set of eight seminars will be devoted to Cryogenics and presented by the lab's award-winning staff, Jan. 25-April 26. Two overview sessions are open to all lab staff, representatives from local industry and graduate engineering students who have a professional interest in the topic; overview sessions will be held at Jefferson Lab in the CEBAF Center auditorium. Six technical presentations are for engineers, senior/mid-level technicians and graduate engineering students; technical sessions will be held in CEBAF Center, Room F113. Eight Continuing Education Units will be granted by the Virginia State Licensing Board to professional engineers who complete the cryogenics series. Space is limited and advanced reservations are required for all sessions.
Environment, Safety, Health and Quality
Hash-Marked Floor - What Does It Mean?
During these times of facility re-arrangement and expansion, floor space is more precious than ever. However, blocking access to critical or safety equipment is not acceptable. Make a conscious decision about where you are positioning items on the floor before you move them, and never use the hash-marked areas.
Computing and Networking Infrastructure
JLab Wireless Change On the Way
JLab_guest Wireless Change On the Way
Mont on Ultraviolet
American Red Cross Blood Drive
JLab Travelers: Get notifications by mobile phone, e-mail, etc.
Protect Your Identify: The Newest Identity Theft Scams
Canine Good Citizen/Therapy Dog International Training at JLab
E-Verify Processing - Are You Finished?
JLab Calendar of Events
Jan. 21: Blood Drive