Jefferson Lab Weekly Briefs
May 26, 2010
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.
Abstract Deadline Nears for Graduate Student Poster Competition
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.
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)
JLab Calendar of Events
May 26: Colloquium and Public Lecture
Summer Education Calendar
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
Colloquium and Public Lecture
Clean the Bay Day Seeks Volunteers
Fire Academy Graduation Ceremony
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.