12 GeV Upgrade

Planning for the 12 GeV accelerator and civil installation tasks during the summer accelerator shutdown (Aug. 13) has been revised to align with the new lab schedule. The scheduled accelerator down tentative schedule can be viewed online. Existing planning tools, such as ATLis (Accelerator Task List) and weekly meetings are being used to coordinate 12 GeV installation activities with the accelerator operations group. The 12 GeV installation tasks include the remaining west arc low-conductivity water supply and return lines, Arc 10 stands, four cryomodule baseplates, radiofrequency waveguide hangers and cables. Bi-monthly 12 GeV space planning meetings are being held to coordinate space and storage requirements with Facilities Management and Logistics, which has resulted in the allocation of off-site storage and work space to support 12 GeV assembly activities.

Physics

Abstract Deadline Nears for Graduate Student Poster Competition
The 4th Annual Graduate Student Poster Competition will take place at the upcoming Users Group Meeting on June 7. First-, second-, and third-place prizes will be awarded. Abstract submissions should be 300 words or less and must be e-mailed no later than COB Friday, May 28. Questions about the competition can be directed to Katherine Myers.

Accelerator

Overall, the accelerator is running well, with low trip rates. On Sunday, one of the quarter-cryomodule cavities malfunctioned, and the control module was replaced. On Monday, RSEP9A mismatched and was repaired. The two events caused several hours of downtime. For most of the week Hall A was not taking beam due to its target chamber vacuum issues.

Free-Electron Laser

The FEL team performed studies of a shorter drive laser pulse structure and found improved performance in the machine. FEL staffers carried out several halo and emittance studies and also examined the longitudinal structure of the beam at 67 picoCoulombs.

JLab's Safety Numbers

28 Days since Last Recordable Accident (JLab record: 331)
71 Days since Last Lost Workday Accident (JLab record: 676)

JLab Calendar of Events

May 26: Colloquium and Public Lecture
May 27: JLab Strategic Plan Open Forum
May 27: Safety Shoe Vendor onsite
May 31: Memorial Day holiday - JLab closed
June 2: Tidewater Regional Fire Academy Graduation
June 7-9: JLab Users Group Workshop and Annual Meeting
June 24: Safety Shoe Vendor onsite

Summer Education Calendar
June 1-18: HUGS 2009 - Hampton University Graduate Studies Program
May 24 - July 31: SULI - Science Undergraduate Laboratory Internship
May 24 - July 31: REU - Research Experience for Undergraduates
June 21 - July 31: HSSHP - High School Summer Honors Program
July 6 - 31: DOE ACTS - Academies Creating Teacher Scientists
July 30: Summer Programs Poster Session

Environment, Safety, Health & Quality

As we head into the summer months, it's important to avoid skin-damaging ultraviolet radiation from the sun. Simple ways to limit exposure to damaging UV include limiting prolonged outdoor activities during the peak hours of UV exposure, 10 a.m. to 3 p.m., and applying sunscreen regularly or wearing sun-protective clothing.

Dermatologists suggest sunscreens with a sun protection factor (SPF) rating of 15 or higher. Sunscreens with SPF numbers higher than 15 may work better for people who are fair-skinned, live at high altitudes, work or play outdoors much of the day, or perspire heavily. Sunscreens should be reapplied after any activity that could remove them from the skin, such as swimming, toweling off or perspiring.

Sun-protective clothing offers another way to protect skin from the harmful effects of the sun. Sun-protective clothes have a label listing the garment's Ultraviolet Protection Factor (UPF) value. These fabrics typically have a tighter weave or knit and are usually darker in color. The higher the clothing's UPF, the more protection it provides from the sun's UV rays. 

Computing and Networking Infrastructure

Possible Outages Thursday Evening
The CNI group is planning work for Thursday, May 27, at 7 p.m. that may cause a temporary loss of connection to the CUE home directories, CUE group and the mail directories. In the unlikely event that the loss of conection occurs, the group will bring the system back up as soon as possible. If you have questions, contact the IT division helpdesk at x7155, or helpdesk@jlab.org.

Announcements

Colloquium and Public Lecture
E.W. Plummer, Louisiana State University, will present "Materials for the 21st Century: A Revolutionary - Not an Evolutionary - Approach" on Wednesday, May 26, in the CEBAF Center auditorium at 4 p.m. According to Plummer, societal needs for new materials are driven by the need for energy, preserving our environment and responding to the American Competitiveness Initiative. His presentation will describe unexpected magnetic properties observed in artificially nano-structured materials and provide examples.

Clean the Bay Day Seeks Volunteers
The Chesapeake Bay Foundation invites the general public to participate in its annual Clean the Bay Day. The event will be held 9 a.m.-noon on Saturday, June 5. For more information and to register, visit the foundation's website.

Fire Academy Graduation Ceremony
The Tidewater Regional Fire Training Academy will hold its class graduation ceremony and reception next Wednesday, June 2, in the CEBAF Center auditorium and lobby. The cadets’ family members will begin arriving shortly after 5 p.m.

After lunch next Wednesday, if you normally park in the main CEBAF Center (east) parking lot, you might want to instead park in the lot between CEBAF Center and the VARC or in front the Test Lab to avoid congestion from the traffic coming to the main CEBAF Center parking lot for the event.