Jefferson Lab Weekly Briefs January 14, 2009
Jefferson Lab Weekly Briefs
January 14, 2009
12 GeV Upgrade
Discussions with the prospective klystron vendors continue with some clarifications transmitted to the vendors. Similar discussions are being held with the potential vendors for the four meter beam transport dipole magnets and the technical evaluations of the bids for the beam transport quadrupole fabrication continue. The prototype digital board, RF (radiofrequency) board and chassis for the low-level RF controls have been assembled together, and testing of the integrated package is underway.
During the holiday break, a target water calibration was performed, the target cell was replaced and cosmics data were taken with BigBite in positive polarity in Hall A. Experiments E06-010, Measurement of Single Target-Spin Asymmetry in Semi-Inclusive Pion-Electroproduction on a Transversely Polarized 3He Target, and E07-013, Target Normal Single-Spin Asymmetry in Inclusive DIS n(e,e') with a polarized 3He Target, are ready to resume taking production data, two days earlier than on the schedule.
JSA Accepting Applications for Graduate Fellowships at JLab
After the holiday break, accelerator operations personnel reconfigured the electron gun at 85 kV and restored the accelerator with five-pass pulsed beam to the Beam Switchyard. The nominal gun voltage is 100 kV, but it was found that the gun exhibits field emission at this voltage. The low gun voltage will lower the field emission, which, in turn, may extend the lifetime of the gun. Some maintenance was performed on RF (radio frequency) modules, magnets and diagnostics system. Seven shifts were spent doing beam studies and training. Ops started continuous wave (CW) beam delivery to Hall A on owl shift on Jan. 14.
Free-Electron Laser (FEL)
The FEL resumed operations this week after a nearly two-week-long holiday. For those who missed the news, FEL staff successfully re-established lasing, and the machine is now operating using several sets of mirrors for short wavelength, broad band and high-power output. Three days of operation were spent setting up the machine carefully for medium-power CW operation. Over the holiday, the Advanced Energy Systems booster module was successfully tested, achieving 12.5 - 17 MV/m in the 750 MHz cavities and successfully operating the third harmonic cavity up to our rf power limit of 4 MV/m.
Last week, Theory Center staff took part in a focused two-day meeting to set out priorities for the Theory Center over the next few years, particularly in view of the quadrennial review of theory groups at national labs coming up this spring. Also discussed were efforts to recruit graduate students and the role of the group in supporting the JLab experimental program.
The installation group acid flushed the Moeller quads and tagger magnets in Line B leading to the hall. The survey and alignment group aligned the target ladder in Halls A and C. With assistance from Hall B staff, the Deeply Virtual Compton Scattering (DVCS) mapper was surveyed; in addition, the Hall B target was re-fiducialized to add more points to assist with locating the target when it is installed in the torus magnet.
JLab's Safety Numbers
9 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
Jan. 15: Users Group Board of Directors Meeting
Environment, Safety, Health & Quality
For those Jefferson Lab personnel planning to attend the Inauguration Day activities on Tuesday, Jan. 20, go prepared.
The Red Cross is arranging for mass care and shelter operations in case of unforeseen issues. Communications regarding contingency supplies of food, water and hygiene essentials have been issued; hotel rooms are booked within a 200-mile radius of Washington, D.C., and all personal vehicles will be restricted from traveling from Virginia into Washington, D.C., on Inauguration Day. Access to portable toilets will be very limited; additionally, water, air and personal item security will be more thorough than normal. Prohibited items along the inaugural route include backpacks, duffel bags, thermoses, strollers and umbrellas. Food or beverages will not be available inside the ceremony perimeter; the only food-related items allowed will be small snacks that can be carried on your person. An extensive list can be found online. Surrendered items will not be returned.
Since personal vehicles are restricted from traveling from Virginia into Washington, D.C., motorists planning to drive or carpool to the event must use an alternative form of transportation to enter the city. This includes the Virginia Railway Express (VRE) and Metrorail subway/bus service. All Virginia bus routes that serve Metrorail stations will provide free service for the day. More transportation information can be found on the Inauguration website.
Thus, if you're planning on a day trip, please ensure that you understand the limitations and prepare appropriately. This includes bringing medication, drinking water, personal hygiene products, warm clothing and care for any dependents that may accompany you. Click the link for more information on Inauguration Day preparations and activities.
Computing and Networking Infrastructure (CNI)
Ten Best Tips to Keep Your Computer Running Smoothly
Time to Update Federal, State Tax Withholdings
Employees can view their current withholding exemptions and make changes through the Employee Self Service System (ESS). The forms are also available on the Internal Revenue Service and Virginia Department of Taxation websites. The Commonwealth of Virginia VA-4 Personal Exemption Worksheet is also available online. For additional assistance, contact Sharon Hay at x7620, or Janet Smith at x7503.
TIAA-CREF Retirement Counseling Sessions
American Red Cross Blood Drive
HRSD Seeks Applications for Pollution Prevention Award