Jefferson Lab Weekly Briefs June 17, 2009
Jefferson Lab Weekly Briefs
June 17, 2009
12 GeV Upgrade
Jefferson Lab Facilities & Logistics personnel together with the 12 GeV Project team are revising the contract for the North and South Access Building Additions to incorporate the electrical utility upgrade work that was previously part of the North and South Access Utilities Upgrade (Low-Conductivity Water) contract. The electrical upgrades will support the accelerator magnet power supplies. The current plan is to award this contract in the first quarter of FY2010, significantly ahead of the baseline schedule.
In Hall A, production running for experiment E05-102, Measuring the Transverse Asymmetries in the 3He(e,e'd) Reaction, continues to proceed very smoothly.
The eg1-dvcs run is proceeding smoothly, with the polarized target operating without problems in Hall B.
In Hall C, the splitter magnet and target for the upcoming hypernuclear experiment have been installed, completing the installation of the experimental magnets for the measurement. The support posts for the three magnets of the pre-target chicane have been placed in preparation for installation of the chicane. The High Resolution Electron Spectrometer detector support frame has been installed and the High Resolution Kaon Spectrometer wire chambers are cabled. Installation of lighting and AC power for the detector bunkers is in progress.
As the accelerator is getting prepared for an extended maintenance down, the experimental halls are enjoying overall smooth beam delivery. Halls A&B split 219 hours of beam. Another item of note was the successful completion of the “Load Shed Test.” This was a test of the accelerator's ability to reduce power consumption quickly and then recover. The main equipment problem seen during the period was the Arc 9 box supply, which kept faulting on earth leakage fault. This difficult-to-diagnose problem was tracked down and fixed by support staff.
FEL staff established lasing and worked on the lasing setup last week. New control software for the advanced drive laser was added, which will make it much more stable and user friendly. A significant amount of time was spent training staff on operation of the machine, so that a larger pool of qualified personnel will be available for running this summer. A number of folks attended the 3rd ERL workshop (175 attendees) at Cornell to review world progress in the technology of recirculating high-current beams.
The Engineering Radiofrequency (EESRF) group performed validation testing of the pre-production version of the 12 GeV low-level radiofrequency controls on the Renascence cryomodule at the Cryomodule Test Facility. This was the first test of the final version of the LLRF system on a cryomodule. System performance measurements were taken and the ability to meet the stringent phase and amplitude controls specification was again demonstrated. The alignment and metrology group have completed the first alignment phase of both the HKS and HES experimental lines in Hall C.
JLab's Safety Numbers
163 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
June 1-19: HUGS 2009
Summer Education Calendar
Environment, Safety, Health & Quality
In preparation for the upcoming summer Scheduled Accelerator Down, a safety briefing was held with all personnel who will be performing work behind the fence. The briefing included information on work planning and documentation, injury and notable event trends, as well as information on specific work to be performed in the Accelerator, FEL and Physics areas.
Additionally, the documentation items below were released for use:
Analysis of Data Procedure (Approved 06/05/09)
Revision/Update of ES&H Manual Chapter 6111 Administrative Control using Locks and Tags and Appendix T1 Administrative Control using Locks and Tags Procedure (Approved 06/08/09)
Computing and Networking Infrastructure
Maintenance Day: Tuesday, June 23, 5-10 p.m.
Mid-Year Radiation Badge Changeout
Anyone needing their dosimeter because they are working during the changeout period or those with questions may contact Becky Mosbrucker at x7236 or page 584-7236.
Remember to return your dosimeter to its place in the assigned rack when it is not in use. Don't leave it in your desk or other work area. Don't leave it in your car. Don't leave it where it will be exposed to direct sunlight.
JLab Annual Property Inventory Underway
To complete the inventory, each item must be physically seen by a member of the property office. The inventories will be conducted by Joan Holloway, Lamont Williams or Chad Johnson from the property office. The physical inventory is scheduled immediately after the annual custodian property validation period, so the locations confirmed during the validation should be reasonably current. Note that it is the property custodian’s responsibility to search for their assigned property and not the property staff. property staff will go to each location identified for each item during the property validation. Any item not at its specified location will be reported as "missing" until the item is physically located by the custodian and verified by property staff. If you have questions, contact Joan Holloway, x7348; Lamont Williams, x6270; or Chad Johnson, x7688.
Calling all CEBAF History Buffs!
Texting While Driving in Virginia Illegal After July 1