12 GeV Upgrade
After effectively completing repairs, the cryogenic distribution box has been moved from the Technology and Engineering Development Building high bay to Hall B. The distribution box is now installed on the third level of the CLAS12 platform. Work is progressing on the pump-out of the Torus magnet in preparation for cool-down next month.
The French magnet factory, Sigmaphi, finished measuring the magnetic field produced by the Super High Momentum Spectrometer (SHMS) dipole magnet. It was run at low current with the coils at room temperature for these measurements. After the magnetic measurements and certification that the thermal-shield system was leak-free, Sigmaphi installed the vacuum vessel's inner bore tube and end plates, the last big pieces of the dipole magnet. Temporary seals will be used to allow a vacuum leak test of all internal systems prior to making the final structural weld. The dipole's cryo-control reservoir (CCR) has left Sigmaphi and is en route to Jefferson Lab. It will be joined to the magnet when they are both inside Hall C. The quadrupole magnets, Q2 and Q3, both now have complete thermal-shield systems, suspension links and fully connected superconducting current leads. The CCRs for the quadrupoles are already mounted in place above the magnets. On Q2, the helium pipes that join the magnet coil vessel to the CCR have been fully welded and inspected. Sigmaphi has finished the design and finite-element analysis of the frame that will support and protect the dipole during its journey to Hall C, while, at Jefferson Lab, the plan for moving, lifting and installing the magnet on the SHMS has now been drafted.
Center for Theoretical and Computational Physics
One of the challenges in quantum many-body physics is calculating the electroweak response of a nucleus by fully accounting for the dynamics of its constituent nucleons. A new paper reports the first such calculation for the electromagnetic response of the 12C nucleus. The results, which are in excellent agreement with experimental data, show that correlations in the initial ground state of 12C and interaction effects in the final states reduce the quasi-elastic peak of the longitudinal response by redistributing strength at low- and high-energy transfer. In the transverse sector, this quenching is offset by the contributions of two-body terms in the nuclear electromagnetic current, which substantially (by 30 percent at low momentum transfer) increase the response from the dominant one-body terms.
Jefferson Lab Calendar of Events
May 16-19: Precision Radiative Corrections for Next-Generation Experiments workshop
May 23-26: Service Award Ceremonies
May 30: Memorial Day holiday, Jefferson Lab closed
May 30- June 18: Hampton University Graduate Studies Program
June 20-22: Users Group Workshop and Annual Meeting |
Environment, Health, Safety and Quality
PPE – The last mitigation to an electrical hazard
Electrical injuries and fatalities (resulting from an electrical shock or an electrical arc flash) are ranked high in the workplace accident categories by the Occupational Safety & Health Administration. As we all know, the safest way for working around electricity is by shutting it off completely and executing a proper lockout/tagout. There are times, however, when electrical systems need to stay energized while being worked on; in these scenarios, other safe work practices have been developed to mitigate the electrical hazard to the lowest possible level.
When PPE (Personal Protective Equipment) is introduced as mitigation, it should be considered the last defense against an electrical hazard. Some simple rules to remember when donning electrical PPE are to ensure that:
- The PPE is correct for the application (voltage & arc flash levels);
- The PPE is in good condition and cared for per the manufacturer guidelines;
- The PPE has been tested per industry standards & best practices; and
- The PPE is properly worn and sized for the worker.
Computing and Networking Infrastructure
IT Systems Maintenance Set for Tuesday, May 17, 5-7 p.m.
There will be a systems maintenance period on Tuesday evening, 5 p.m. until 7 p.m. During this time, there will be a brief (about 10 minute) phone outage in CEBAF Center wings A, B, and the second floor of F wing. All computers connected through the phones will continue to work. Patches for all managed Linux and Windows systems will also be released. There will also be short outages of system services overnight while systems are rebooted to finalize patch installation. Finally, plan on rebooting your desktop computer no later than Friday, May 20, by close of business. If you have any questions or concerns regarding these outages, contact the IT Division Helpdesk at helpdesk@jlab.org or x7155.
Announcements
Last Chance to Provide Your Feedback on the 2016 Jefferson Lab Open House
The efforts of hundreds of volunteers, exhibitors and subcontractors enabled more than 12,000 visitors to experience the science, technology and research that Jefferson Lab has to offer. These record-breaking crowds stretched the site to the limits, and we appreciate all of the efforts that our volunteers put into helping the crowds negotiate the site. We're looking for your feedback on your Open House experience, so that we can improve it for everyone for future events. The anonymous survey is available via SurveyMonkey. It's available to anyone associated with Jefferson Lab staff, Users, family or friends who volunteered for or attended the event.
Workshop: Strategies for Planning, Developing, and Writing Large Team Grants
Karen Eck, Assistant Vice President for Research in the Office of Research at Old Dominion University, will address issues faced by researchers in transitioning from smaller group or individual grants to larger team grants, which offer unique challenges and are more complex to plan, develop and write. Learn about strategies for developing competitive partnership proposals and about project management essentials, such as starter templates, the elements of a successful narrative and "red team" reviews, as well as scheduling and task assignments for proposal planning. The workshop will take place Friday, May 20, 10 a.m.-noon in CEBAF Center room F224-225. No advance registration is required.
Run-A-Round T-Shirts Available for Distribution and Special Order until May 20
This year’s winning design was submitted by the Diversity Committee and is titled "Diverse in Community, United in Science." Run-A-Round volunteers — you worked hard — don’t forget to redeem your vouchers at the front desk of CEBAF Center for your free T-shirt. Users and staff who participated in the run are also encouraged to submit their bib T-shirt coupon (eligible if there is a colored sticker with the word “rainbow” attached). Also available for purchase, at very reasonable prices, are T-shirts in sizes XS to 4XL in styles for men, kids, women v-neck, and hoodie sweatshirts (zip and non-zip). Come by the front desk to see samples and fill out an order form. |
