Jefferson Lab Weekly Briefs
April 29, 2009
12 GeV Upgrade
Phase 1 work of the Central Helium Liquefier (CHL) Building Addition is substantially complete, and the helium tube trailer has been relocated from the west side of the CHL Building to the east side. Phase 1 work included relocation of a fire hydrant, pouring of new asphalt and installation of a guardrail along the cryo transfer lines. On the west side, the storm drainage utilities have been installed to facilitate the new addition’s footprint. The contractor is installing auger cast piles adjacent to the existing CHL building to provide shoring for the existing building’s foundation. CEBAF Boulevard is closed adjacent to the new building addition and traffic is being detoured to the ring road.
The Hall D construction contractor has completed its Environmental Protection and Safety Plans. It is anticipated that tree clearing will begin in the next two weeks. Personnel are reminded that the walking trail in the Hall D construction area is closed; posted signs indicate the closed area.
Commissioning for the next two polarized 3He experiments, E05-015, a Measurement of the Quasi-elastic Single Spin Asymmetry and E08-005, Measuring the Transverse Asymmetry in the 3He(e,e'n) Reaction, is going very smoothly. Production running is expected to start on Wednesday after changing the beam energy to three-pass.
The accelerator was successfully set up with the energy at 5.968 GeV. The electron gun high voltage was changed back from -85kV to -100kV. Hall A started to take continuous wave beam on Friday, April 25. Hall B is not ready to take beam yet. Hall C is not scheduled to take beam during this spring run, since it is installing its next experiment. While delivering beam, Operations personnel are also executing the radiofrequency cavity quality factor measurement test plan parasitically.
Free-Electron Laser (FEL)
FEL staffers have updated several of the control systems to new servers. Work is proceeding on the piping required for re-establishing cooling water to the facility by May 18.
JLab's Safety Numbers
114 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
May 1: Adopt-A-Spot Litter Pickup
Environment, Safety, Health & Quality
The lab trend analysis recently presented to the Director's Safety Council showed two notable patterns: a 70 percent increase in reporting of medical events as pertaining to mishaps or incidents from October 1, 2008 - March 31, 2009 (vs. April 1 - Sept 30, 2008) and a work-force shift from Health, Safety and Security audit prep and recovery back to more field-work-oriented items.
Over the past calender year, 14 of 19 medical events occurred or were reported in the first and second quarters of '09. The site feedback is that the emphasis on reporting and prevention of recurrence is the main driver. The main difference in the time periods was sitewide communication; specifically
Regarding the work force shift back to more field-work-oriented items, this was reflected in data from the ESH&Q Safety Observations, the Corrective Actions Tracking System and from Facilities Management and Logistics. The main finding category for the third and fourth quarters of '08 was procedures. This was consistent in ESH&Q Safety Observations and the CATS. Over the first and second quarters of '09, this category has decreased significantly, replaced by these categories: personnel, personal protective equipment, positions and tools.
Computing and Networking Infrastructure
Computer User Audit
Healthy Perks for Moms Who Work
Volunteers Needed for Earth Day/Adopt-A-Spot Litter Pick up on May 1
2009 Jefferson Activities Group Run-A-Round Set for May 20