Jefferson Lab Weekly Briefs January 30, 2008
Jefferson Lab Weekly Briefs
January 30, 2008
12 GeV Upgrade
The 12 GeV Accelerator Team continues to make good progress on the Project Engineering Design (PED). The cryomodule team will soon complete the planned work for FY08 and will begin work originally planned for FY09. A modified plan for the PED of the Low-Level Radio Frequency (LLRF) controls has been implemented following an approved Change Request in December; a significant event this month was completion of the new digital board for that system. The Cryogenics Team is on cost and ahead of schedule on its design work. All the 12 GeV accelerator teams have draft Advance Procurement Plans (APP) under review for the major FY09 procurements; the Cryogenics team has completed its FY09 APP and has a draft APP for its FY10 major procurements. Initial laminations have been received for the R&D prototype Beam Transport quadrupoles; these will be inspected prior to the vendor starting stacking.
After the successful completion of the Coulomb Sum Rule experiment in Hall A on Wednesday, Jan. 16, the target configuration was changed to one with several conduction-cooled solid targets, each containing a lead foil sandwiched between two diamond wafers. The changeover went very smoothly due to the support of the target, the survey and the RadCon groups. On Sunday, production data taking started for the extension of the 208Pb(e,e'p) experiment, E06-007, and beam delivery has been smooth since then.
Hall C has set up and started running E07-002, a one-week experiment to study polarization transfer in wide angle compton scattering. This experiment uses a modification of the GEp experiment setup, with a radiator in front of the target to produce a polarized bremsstrahlung beam. The BigCal detector has been augmented with the BigBite magnet, which is used to sweep away charged particles so that BigCal can detect photons. The polarization transferred to the proton is measured with the focal plane polarimeter in the High Momentum Spectrometer.
The Accelerator ran very well during this past week, with the halls receiving a total of 362 hours of beam. The few minor problems encountered were due to Hall A Compton rate tuning efforts and some beam break up (BBU) issues that were quickly addressed by Optics personnel. There are Test Plans in the works to further investigate the BBU issues, especially their possible connection to radiofrequency zone NL04.
Free-Electron Laser (FEL)
Work is continuing on the Gun Test Stand high voltage with an examination of some field emission that has developed in the high-voltage power supply. The FEL gun is being prepared for a re-bake after a mechanical problem on the cathode door was fixed.
JLab's Safety Numbers
133 Days since Last Recordable Accident (JLab record: 319)
JLab Calendar of Events
Feb. 2: Virginia Regional High School Science Bowl
Come Out and Play on the JLab Softball Team
Environment, Safety, Health & Quality
According to the Consumer Product Safety Commission, extension cord-related fires occur every six minutes in the U.S., resulting in about 50 deaths and an average of $50 million in property damage each year. Some of us are using extension cords to supply power to supplemental electric heating units; extra care is needed, as supplemental heating units typically have higher electrical power requirements than many appliances and power tools. Here are a few extension cord safe-use recommendations from the National Safety Council:
DOE Material Handling Injury Lesson Learned
Computing and Networking Infrastructure
CNI Maintenance Day is scheduled for Feb. 12
Feb. 12 e-mail changes to impact users of Pine, Mutt and mailx clients
The changes that will take place are two-fold:
Additional changes that will affect all users and where you store your e-mail folders will take place later in the spring/summer. Announcements will be made regarding those changes at a later date.
Automatic Installation of Microsoft Office on March 4