Jefferson Lab Weekly Briefs December 2, 2009
Jefferson Lab Weekly Briefs
December 2, 2009
12 GeV Upgrade
The first articles of the two new beam transport quadrupole magnets have been received from the vendor, and testing has been started. A proposal to shift additional accelerator installation work from the 2012-13 twelve-month down to the 2011 six-month down has been studied by the Accelerator and Physics Divisions, and the follow-on detailed planning is underway. The contract was awarded for the vacuum vessels and helium vessels to be used for the 12 GeV Upgrade cryomodules. The best-and-final offers have been received from the bidders on the high-voltage power supplies needed for the radiofrequency amplifiers. The contract was awarded for the new dipole magnets to be used in the existing five-pass recirculation beam transport system.
PAC Proposal Deadline Approaching
Confessions of a Converted Lecturer
JSA/JLab Graduate Fellowship Program
JSA/JLab Sabbatical Support Program
On Nov. 24, the laser spot was moved to a new location to boost the quantum efficiency of the photocathode. The insulating vacuum pump of zone 1L06 was replaced to improve the vacuum. The next day, the injector was optimized to lower the Hall A Compton noise level. The accelerator ran well over the Thanksgiving holiday.
Exclusive J/Ψ electroproduction has recently been studied in the framework of the Modified Dual Amplitude with Mandelstam Analyticity model by Theory Center staff and European collaborators <arXiv:0911.2094 [hep-ph]>. The model is found to give a good description of available data over a wide range of kinematics. This framework can in future be used to model the smooth background in the extraction of tiny resonance signals in the near-to-threshold region in JLab experiments.
JLab's Safety Numbers
13 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
Dec. 5: JLab Children's Holiday Party
Environment, Safety, Health & Quality
An Electrical Engineering Support worker was testing a circuit board in a pre-fabricated test fixture. The work involved less than 50 volts; therefore, he did not need eye personal protective equipment per the ES&H Manual. After about 30 seconds of operation, a 15-volt voltage regulator overheated, even though the regulator was supposed to be protected by a fuse (the fuse was designed to fail and protect the regulator from overheating). When the regulator overheated, it burst, sending small plastic fragments into the work area and into the worker's left eye. The injured worker was driven to Occupational Medicine for evaluation. Dr. Chandler sent the worker to an offsite ophthalmologist, who removed debris, including a small plastic sliver that was embedded in the cornea of the worker's eye, making this a recordable injury. The ophthalmologist prescribed medication and recommended a day off for recovery.
In light of this incident, ESH&Q is reminding workers of the importance of regularly reviewing the use of personal protective equipment with their supervisors and within work groups, particularly for "skill of the craft" tasks.
Computing and Networking Infrastructure
On Monday, Dec. 7, the CNI group will finish the upgrade of JLab's wireless network. Here's what you need to know in order to connect wirelessly next week:
Note: The wireless network 'jlab_secure' will be taken out of service on Dec. 7.
Mobile Mammography Unit Onsite
Don't Forget to Check Your Keys!
The second step will be a key verification for 10 percent of individuals as a quality check. This activity will occur in January 2010. If you have any questions about the validation, e-mail Dennis Merritt.
Winter Wonderland Children's Party
Toys for Tots Toy Drive Underway
Door and Cubicle Decorating Contest