Jefferson Lab Weekly Briefs May 5, 2010

Jefferson Lab Weekly Briefs
May 5, 2010

12 GeV Upgrade

Coordinated planning is well underway for the upcoming summer 2010 scheduled accelerator shutdown, which includes installing the following: the remaining west arc low-conductivity-water (LCW) supply and return lines, Arc 10 stands, four cryomodule baseplates, RF waveguide hangers and cables. Planning for the 12 GeV assembly and installation efforts includes the identification and coordination of requirements for material handling equipment, transportation and storage/assembly space. 

At the request of the Office of Nuclear Physics, Daniel Lehman, Director of the Office of Project Assessment in DOE's Office of Science, convened a team of 13 experts in an Independent Project Review of the 12 GeV Upgrade on April 27-28. The purpose of the review was to assess progress in all aspects of the project since last September. The review committee concluded at the closeout that the project is making satisfactory progress and provided ten recommendations to guide activities in the coming months.


Beam delivery was stopped at 7:30 a.m. on Friday, April 30, to prepare for the May 1 Open House. While the accelerator was down, scheduled maintenance and injector beam studies were performed. After the event, the accelerator was recovered by 8:15 p.m. Then, on Sunday, the Central Helium Liquefier tripped, possibly due to a power glitch, causing more than five hours of downtime. On Monday, the accelerator optics was optimized, and Hall B was changed to pass five.

Free-Electron Laser

The FEL team provided beam for optical measurements and to a user group last week to measure the biological effects of terahertz radiation. The group successfully completed a set of measurements.

Theory Center

Focusing on the baryon spectrum, the Hadron Spectrum Collaboration, including members of the Theory Center, computed the excited spectrum of the nucleon and Δ in lattice QCD at three values of the light quark masses <arXiv:1004:5072>.  The pattern of states was in reasonable agreement with that observed in experiment. However, the expected multi-particle states in the spectrum were not found, emphasising the need to broaden the operator basis to include multi-hadron operators.

JLab's Safety Numbers

22 Days since Last Recordable Accident (JLab record: 331)
50 Days since Last Lost Workday Accident (JLab record: 676)

JLab Calendar of Events

May 6: TEDF & Construction Town Meeting
May 11: Colloquium and Public Lecture
May 12: JLab's 25th Annual Run-A-Round
May 26: Colloquium and Public Lecture
May 27: Safety Shoe Vendor onsite
May 31: Memorial Day holiday - JLab closed
June 1 - June 18: Hampton University Graduate Studies Program
June 2: Tidewater Regional Fire Academy Graduation
June 7-9: JLab Users Group Workshop and Annual Meeting
June 24: Safety Shoe Vendor onsite




Environment, Safety, Health & Quality

Watch for Insects that Bite or Sting
The most frequent insect-related hazard at JLab comes from insects in the Genus Hymenoptera, which includes wasps (such as yellow jackets and hornets) and bees. These insects can be found anywhere, from “in-ground” nests to vegetation, building surfaces (interior and exterior), any equipment stored outside, golf carts and unprotected commercial gas valve caps.

Workers at JLab have experienced insect bites or stings that have been serious enough to require time off from the job. If left untreated or if improperly treated, bites and stings can get infected and result in unnecessary discomfort and lost work time.

When you do your pre-job walk down, look for flying insects and evidence of wasp nests, and be cautious when disturbing grounds, equipment or building locations that have been undisturbed for long periods. If you see evidence of flying, stinging insects, call x7400 and ask Facilities Management and Logistics to respond. FM&L has a pest control subcontractor that routinely applies environmentally friendly insecticide to locations around the site to help manage pests. If you are bitten or stung by a bug of any kind, obtain prompt first aid from Occupational Medicine.


JLab TEDF & General Construction Update Town Meeting
FM&L is holding a Town Meeting in the auditorium on Thursday from 1-2 p.m. to update the JLab community about the TEDF project as well as the other general facilities projects currently underway across the laboratory and those planned for FY 2011. Keith Royston will discuss the TEDF Project. Rusty Sprouse will discuss the array of general facilities projects. The TEDF Construction Contractor project manager will also be present. Anyone in the JLab community interested in this information is invited to attend.

Colloquium and Public Lecture Set for Tuesday, May 11
Srikumar Banerjee, Chairman of the Atomic Energy Commission & Secretary of the Department of Atomic Energy in India, will present a colloquium titled "Accelerator Driven System (ADS) in Support of Sustainable Nuclear Power Program in India." The talk will describe aspects of ADS in support of sustainable nuclear power in India and the status of activities initiated under an R&D program on ADS. The colloquium will be held in the CEBAF Center auditorium at 2 p.m. on Tuesday, May 11.

JAG Run-A-Round Event Registration Closes Tuesday
Runners who wish to be eligible for awards have until 5 p.m. on Tuesday, May 11, to register online for the 2010 JAG Run-A-Round. A non-award late registration option will be available the day of the event. There are also just a few slots left in the online signup for volunteers.